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ribs</title> <meta name="description" content="Search results for: cylindrical ribs"> <meta name="keywords" content="cylindrical ribs"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="cylindrical ribs"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 365</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: cylindrical ribs</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">365</span> Simulation and Experimentation of Solar Thermal Collector for Air Heating System Using Dynamic Ribs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nishitha%20Chowdary">Nishitha Chowdary</a>, <a href="https://publications.waset.org/abstracts/search?q=Prabhav%20Dwivedi"> Prabhav Dwivedi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Solar radiation (or insolation) is responsible for 174 petawatts (PW) of energy reaching the Earth's atmosphere. About one-third of this is reflected in space. Solar energy is by far the most abundant source of energy on Earth. In this study to use solar energy to the fullest in a solar air heater, An analysis of a solar air heater duct roughened with fixed cylindrical ribs in 3-D has been done using CFD. These fixed cylindrical ribs have a uniform circular cross-section and are placed in transverse in-line and staggered arrangements. The orientation of ribs has been fixed and is perpendicular to the in-flow direction. Cylindrical ribs are arranged periodically with fixed pitch; therefore, one pitch length is only considered in the present study. Validation has been done with smooth as well as with roughened duct and is matched perfectly with the developed correlations. Geometric parameters, namely rib height (e), ranges from 1 to 2 mm and pitch ranges from 10 to 40 mm are used in the present investigation. Thermo-hydraulic performance parameters in terms of average Nusselt number and friction factor have been extracted for Reynolds number ranging 5000—18000 to optimize the performance of roughened duct. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20ribs" title="cylindrical ribs">cylindrical ribs</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20air%20heater" title=" solar air heater"> solar air heater</a>, <a href="https://publications.waset.org/abstracts/search?q=thermo-hydraulic%20performance%20factor" title=" thermo-hydraulic performance factor"> thermo-hydraulic performance factor</a>, <a href="https://publications.waset.org/abstracts/search?q=roughened%20duct" title=" roughened duct"> roughened duct</a> </p> <a href="https://publications.waset.org/abstracts/145029/simulation-and-experimentation-of-solar-thermal-collector-for-air-heating-system-using-dynamic-ribs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/145029.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">154</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">364</span> Acoustic Radiation from an Infinite Cylindrical Shell with Periodic Lengthwise Ribs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yunzhe%20Tong">Yunzhe Tong</a>, <a href="https://publications.waset.org/abstracts/search?q=Jun%20Fan"> Jun Fan</a>, <a href="https://publications.waset.org/abstracts/search?q=Bin%20Wang"> Bin Wang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The vibroacoustic behavior of an immersed infinite cylindrical shell with periodic lengthwise ribs has been studied in this paper. The motions of the shell are described by the Donnell equations. Each lengthwise rib is modeled as an elastic beam. The motions of the bulkheads are decomposed into the longitudinal motions and flexural motions. The analytical expressions of the shell motions can be obtained through circumferential mode expansion, Fourier Transform and periodic boundary condition in the circumferential direction. Furthermore, the far-field radiated pressure has been obtained using the stationary phase. The analysis of wavenumber domain shows that periodic lengthwise stiffeners in the circumferential direction can produce flexural Bloch waves. The dominant feature in far-field pressure amplitude is the resonance of the supersonic components of the flexural Bloch waves in the circumferential direction. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=flexural%20Bloch%20wave" title="flexural Bloch wave">flexural Bloch wave</a>, <a href="https://publications.waset.org/abstracts/search?q=stiffened%20shell" title=" stiffened shell"> stiffened shell</a>, <a href="https://publications.waset.org/abstracts/search?q=vibroacoustics" title=" vibroacoustics"> vibroacoustics</a>, <a href="https://publications.waset.org/abstracts/search?q=wavenumber%20analysis" title=" wavenumber analysis"> wavenumber analysis</a> </p> <a href="https://publications.waset.org/abstracts/90699/acoustic-radiation-from-an-infinite-cylindrical-shell-with-periodic-lengthwise-ribs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90699.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">209</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">363</span> Effective Cooling of Photovoltaic Solar Cells by Inserting Triangular Ribs: A Numerical Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Saadi">S. Saadi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Benissaad"> S. Benissaad</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Poncet"> S. Poncet</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Kabar"> Y. Kabar </a> </p> <p class="card-text"><strong>Abstract:</strong></p> In photovoltaic (PV) cells, most of the absorbed solar radiation cannot be converted into electricity. A large amount of solar radiation is converted to heat, which should be dissipated by any cooling techniques. In the present study, the cooling is achieved by inserting triangular ribs in the duct. A comprehensive two-dimensional thermo-fluid model for the effective cooling of PV cells has been developed. It has been first carefully validated against experimental and numerical results available in the literature. A parametric analysis was then carried out about the influence of the number and size of the ribs, wind speed, solar irradiance and inlet fluid velocity on the average solar cell and outlet air temperatures as well as the thermal and electrical efficiencies of the module. Results indicated that the use of triangular ribbed channels is a very effective cooling technique, which significantly reduces the average temperature of the PV cell, especially when increasing the number of ribs. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=effective%20cooling" title="effective cooling">effective cooling</a>, <a href="https://publications.waset.org/abstracts/search?q=numerical%20modeling" title=" numerical modeling"> numerical modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=photovoltaic%20cell" title=" photovoltaic cell"> photovoltaic cell</a>, <a href="https://publications.waset.org/abstracts/search?q=triangular%20ribs" title=" triangular ribs"> triangular ribs</a> </p> <a href="https://publications.waset.org/abstracts/90057/effective-cooling-of-photovoltaic-solar-cells-by-inserting-triangular-ribs-a-numerical-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90057.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">177</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">362</span> Heat Transfer and Friction Factor Study for Triangular Duct Solar Air Heater Having Discrete V-Shaped Ribs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Varun%20Goel">Varun Goel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Solar energy is a good option among renewable energy resources due to its easy availability and abundance. The simplest and most efficient way to utilize solar energy is to convert it into thermal energy and this can be done with the help of solar collectors. The thermal performance of such collectors is poor due to less heat transfer from the collector surface to air. In this work, experimental investigations of single pass solar air heater having triangular duct and provided with roughness element on the underside of the absorber plate. V-shaped ribs are used for investigation having three different values of relative roughness pitch (p/e) ranges from 4-16 for a fixed value of angle of attack (α), relative roughness height (e/Dh) and a relative gap distance (d/x) values are 60°, 0.044 and 0.60 respectively. Result shows that considerable augmentation in heat transfer has been obtained by providing roughness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=artificial%20roughness" title="artificial roughness">artificial roughness</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20air%20heater" title=" solar air heater"> solar air heater</a>, <a href="https://publications.waset.org/abstracts/search?q=triangular%20duct" title=" triangular duct"> triangular duct</a>, <a href="https://publications.waset.org/abstracts/search?q=V-shaped%20ribs" title=" V-shaped ribs"> V-shaped ribs</a> </p> <a href="https://publications.waset.org/abstracts/20205/heat-transfer-and-friction-factor-study-for-triangular-duct-solar-air-heater-having-discrete-v-shaped-ribs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20205.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">452</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">361</span> A Preliminary Study on the Effects of Lung Impact on Ballistic Thoracic Trauma</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Amy%20Pullen">Amy Pullen</a>, <a href="https://publications.waset.org/abstracts/search?q=Samantha%20Rodrigues"> Samantha Rodrigues</a>, <a href="https://publications.waset.org/abstracts/search?q=David%20Kieser"> David Kieser</a>, <a href="https://publications.waset.org/abstracts/search?q=Brian%20Shaw"> Brian Shaw</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of the study was to determine if a projectile interacting with the lungs increases the severity of injury in comparison to a projectile interacting with the ribs or intercostal muscle. This comparative study employed a 10% gelatine based model with either porcine ribs or balloons embedded to represent a lung. Four sample groups containing five samples were evaluated; these were control (plain gel), intercostal impact, rib impact, and lung impact. Two ammunition natures were evaluated at a range of 10m; these were 5.56x45mm and 7.62x51mm. Aspects of projectile behavior were quantified including exiting projectile weight, location of yawing, projectile fragmentation and distribution, location and area of the temporary cavity, permanent cavity formation, and overall energy deposition. Major findings included the cavity showing a higher percentage of the projectile weight exit the block than the intercostal and ribs, but similar to the control for the 5.56mm ammunition. However, for the 7.62mm ammunition, the lung was shown to have a higher percentage of the projectile weight exit the block than the control, intercostal and ribs. The total weight of projectile fragments as a function of penetration depth revealed large fluctuations and significant intra-group variation for both ammunition natures. Despite the lack of a clear trend, both plots show that the lung leads to greater projectile fragments exiting the model. The lung was shown to have a later center of the temporary cavity than the control, intercostal and ribs for both ammunition types. It was also shown to have a similar temporary cavity volume to the control, intercostal and ribs for the 5.56mm ammunition and a similar temporary cavity to the intercostal for the 7.62mm ammunition The lung was shown to leave a similar projectile tract than the control, intercostal and ribs for both ammunition types. It was also shown to have larger shear planes than the control and the intercostal, but similar to the ribs for the 5.56mm ammunition, whereas it was shown to have smaller shear planes than the control but similar shear planes to the intercostal and ribs for the 7.62mm ammunition. The lung was shown to have less energy deposited than the control, intercostal and ribs for both ammunition types. This comparative study provides insights into the influence of the lungs on thoracic gunshot trauma. It indicates that the lungs limits projectile deformation and causes a later onset of yawing and subsequently limits the energy deposited along the wound tract creating a deeper and smaller cavity. This suggests that lung impact creates an altered pattern of local energy deposition within the target which will affect the severity of trauma. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ballistics" title="ballistics">ballistics</a>, <a href="https://publications.waset.org/abstracts/search?q=lung" title=" lung"> lung</a>, <a href="https://publications.waset.org/abstracts/search?q=trauma" title=" trauma"> trauma</a>, <a href="https://publications.waset.org/abstracts/search?q=wounding" title=" wounding"> wounding</a> </p> <a href="https://publications.waset.org/abstracts/106200/a-preliminary-study-on-the-effects-of-lung-impact-on-ballistic-thoracic-trauma" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/106200.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">170</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">360</span> Finite Element Analysis of Low-Velocity Impact Damage on Stiffened Composite Panels</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Xuan%20Sun">Xuan Sun</a>, <a href="https://publications.waset.org/abstracts/search?q=Mingbo%20Tong"> Mingbo Tong</a> </p> <p class="card-text"><strong>Abstract:</strong></p> To understand the factors which affect impact damage on composite structures, particularly the effects of impact position and ribs. In this paper, a finite element model (FEM) of low-velocity impact damage on the composite structure was established via the nonlinear finite element method, combined with the user-defined materials subroutine (VUMAT) of the ABAQUS software. The structural elements chosen for the investigation comprised a series of stiffened composite panels, representative of real aircraft structure. By impacting the panels at different positions relative to the ribs, the effect of relative position of ribs was found out. Then the simulation results and the experiments data were compared. Finally, the factors which affect impact damage on the structures were discussed. The paper was helpful for the design of stiffened composite structures. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stiffened" title="stiffened">stiffened</a>, <a href="https://publications.waset.org/abstracts/search?q=low-velocity%20impact" title=" low-velocity impact"> low-velocity impact</a>, <a href="https://publications.waset.org/abstracts/search?q=Abaqus" title=" Abaqus"> Abaqus</a>, <a href="https://publications.waset.org/abstracts/search?q=impact%20energy" title=" impact energy"> impact energy</a> </p> <a href="https://publications.waset.org/abstracts/11275/finite-element-analysis-of-low-velocity-impact-damage-on-stiffened-composite-panels" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11275.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">621</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">359</span> Investigation of Bird Impact on Tailplane</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Reza%20Hedayati">Reza Hedayati</a>, <a href="https://publications.waset.org/abstracts/search?q=Meysam%20Jahanbakhshi"> Meysam Jahanbakhshi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The typical airplane stabilizer structures consist of two main similar segments (outer and inner parts), one of them a little larger than the other. In this study, bird impact on four different spots of the stabilizer structure: (a) between two ribs of smaller segment, (b) between two ribs of larger segment, (c) on the rib connecting the two segments, and (d) on a middle rib of the smaller segment, is investigated and their results are compared by means of energy absorption, displacement, and bird’s mass diagrams as well as visible damage induced on the stabilizer structure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=airplane" title="airplane">airplane</a>, <a href="https://publications.waset.org/abstracts/search?q=bird%20strike" title=" bird strike"> bird strike</a>, <a href="https://publications.waset.org/abstracts/search?q=LS-DYNA" title=" LS-DYNA"> LS-DYNA</a>, <a href="https://publications.waset.org/abstracts/search?q=stabilizer" title=" stabilizer "> stabilizer </a> </p> <a href="https://publications.waset.org/abstracts/23915/investigation-of-bird-impact-on-tailplane" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23915.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">404</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">358</span> The Characteristics of the Fragments from Cylindrical Casing with One of End Caps Fully Constrained</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yueguang%20Gao">Yueguang Gao</a>, <a href="https://publications.waset.org/abstracts/search?q=Qi%20Huang"> Qi Huang</a>, <a href="https://publications.waset.org/abstracts/search?q=Shunshan%20Feng"> Shunshan Feng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to study the process and characteristic of the fragments in the warhead with one end cap under full constraint condition, we established a cylindrical casing with two end caps which one of which was fully constrained using the simulation analysis. The result showed that the fragmentation of cylindrical casing with one end full constrained has its own characteristic. The Mach stem was generated when the detonation wave propagated to the fully constrained end cap under the condition of one end detonation, working on unreactive explosives and causing the nearby fragment subjected to nearly 2.5 times the normal pressure to obtain a higher speed. The cylindrical casing first ruptured at the contact surface with the fully constrained end, and then at the end cover of the initiating end, and then the rupture extends to the whole cylindrical casing. The detonation products started to leak out from the rupture. Driving fragments to fly and forming two dense flying areas. The analysis of this paper can provide a reference for the optimal design of this kind of warhead. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fragment" title="fragment">fragment</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20casing" title=" cylindrical casing"> cylindrical casing</a>, <a href="https://publications.waset.org/abstracts/search?q=detonation%20waves" title=" detonation waves"> detonation waves</a>, <a href="https://publications.waset.org/abstracts/search?q=numerical%20simulation" title=" numerical simulation"> numerical simulation</a> </p> <a href="https://publications.waset.org/abstracts/133630/the-characteristics-of-the-fragments-from-cylindrical-casing-with-one-of-end-caps-fully-constrained" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/133630.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">124</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">357</span> Fabrication of Cylindrical Silicon Nanowire-Embedded Field Effect Transistor Using Al2O3 Transfer Layer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sang%20Hoon%20Lee">Sang Hoon Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Tae%20Il%20Lee"> Tae Il Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Su%20Jeong%20Lee"> Su Jeong Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Jae%20Min%20Myoung"> Jae Min Myoung</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to manufacture short gap single Si nanowire (NW) field effect transistor (FET) by imprinting and transferring method, we introduce the method using Al2O3 sacrificial layer. The diameters of cylindrical Si NW addressed between Au electrodes by dielectrophoretic (DEP) alignment method are controlled to 106, 128, and 148 nm. After imprinting and transfer process, cylindrical Si NW is embedded in PVP adhesive and dielectric layer. By curing transferred cylindrical Si NW and Au electrodes on PVP-coated p++ Si substrate with 200nm-thick SiO2, 3μm gap Si NW FET fabrication was completed. As the diameter of embedded Si NW increases, the mobility of FET increases from 80.51 to 121.24 cm2/V•s and the threshold voltage moves from –7.17 to –2.44 V because the ratio of surface to volume gets reduced. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Al2O3%20sacrificial%20transfer%20layer" title="Al2O3 sacrificial transfer layer">Al2O3 sacrificial transfer layer</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20silicon%20nanowires" title=" cylindrical silicon nanowires"> cylindrical silicon nanowires</a>, <a href="https://publications.waset.org/abstracts/search?q=dielectrophorestic%20alignment" title=" dielectrophorestic alignment"> dielectrophorestic alignment</a>, <a href="https://publications.waset.org/abstracts/search?q=field%20effect%20transistor" title=" field effect transistor"> field effect transistor</a> </p> <a href="https://publications.waset.org/abstracts/19299/fabrication-of-cylindrical-silicon-nanowire-embedded-field-effect-transistor-using-al2o3-transfer-layer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19299.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">457</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">356</span> Investigating the Capacity of Cracking Torsion of Rectangular and Cylindrical RC Beams with Spiral and Normal Stirrups </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hadi%20Barghlame">Hadi Barghlame</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20A.%20Lotfollahi-Yaghin"> M. A. Lotfollahi-Yaghin</a>, <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Mohammad%20Rezaei"> Mehdi Mohammad Rezaei</a>, <a href="https://publications.waset.org/abstracts/search?q=Saeed%20Eskanderzadeh"> Saeed Eskanderzadeh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, the capacity of cracking torsion on rectangular and cylindrical beams with spiral and normal stirrups in similar properties are investigated. Also, in the beams with spiral stirrups, stirrups are not wrapping and spiral stirrups similar to normal stirrups in ACI code. Therefore, models of above-mentioned beams have been numerically analyzed under various loads using ANSYS software. In this research, the behavior of rectangular reinforced concrete beams is compared with the cylindrical reinforced concrete beams. The capacity of cracking torsion of rectangular and cylindrical RC beams with spiral and normal stirrups are same. In the other words, the behavior of rectangular RC beams is similar to cylindrical beams. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cracking%20torsion" title="cracking torsion">cracking torsion</a>, <a href="https://publications.waset.org/abstracts/search?q=RC%20beams" title=" RC beams"> RC beams</a>, <a href="https://publications.waset.org/abstracts/search?q=spiral%20stirrups" title=" spiral stirrups"> spiral stirrups</a>, <a href="https://publications.waset.org/abstracts/search?q=normal%20stirrups" title=" normal stirrups"> normal stirrups</a> </p> <a href="https://publications.waset.org/abstracts/33354/investigating-the-capacity-of-cracking-torsion-of-rectangular-and-cylindrical-rc-beams-with-spiral-and-normal-stirrups" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33354.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">290</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">355</span> Nonlinear Free Vibrations of Functionally Graded Cylindrical Shells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Alexandra%20Andrade%20Brand%C3%A3o%20Soares">Alexandra Andrade Brandão Soares</a>, <a href="https://publications.waset.org/abstracts/search?q=Paulo%20Batista%20Gon%C3%A7alves"> Paulo Batista Gonçalves</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Using a modal expansion that satisfies the boundary and continuity conditions and expresses the modal couplings characteristic of cylindrical shells in the nonlinear regime, the equations of motion are discretized using the Galerkin method. The resulting algebraic equations are solved by the Newton-Raphson method, thus obtaining the nonlinear frequency-amplitude relation. Finally, a parametric analysis is conducted to study the influence of the geometry of the shell, the gradient of the functional material and vibration modes on the degree and type of nonlinearity of the cylindrical shell, which is the main contribution of this research work. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20shells" title="cylindrical shells">cylindrical shells</a>, <a href="https://publications.waset.org/abstracts/search?q=dynamics" title=" dynamics"> dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=functionally%20graded%20material" title=" functionally graded material"> functionally graded material</a>, <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20vibrations" title=" nonlinear vibrations"> nonlinear vibrations</a> </p> <a href="https://publications.waset.org/abstracts/183404/nonlinear-free-vibrations-of-functionally-graded-cylindrical-shells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/183404.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">65</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">354</span> Study on the Stability of Large Space Expandable Parabolic Cylindrical Antenna</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chuanzhi%20Chen">Chuanzhi Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Wenjing%20Yu"> Wenjing Yu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Parabolic cylindrical deployable antenna has the characteristics of wide cutting width, strong directivity, high gain, and easy automatic beam scanning. While, due to its large size, high flexibility, and strong coupling, the deployment process of parabolic cylindrical deployable antenna presents such problems as unsynchronized deployment speed, large local deformation and discontinuous switching of deployment state. A large deployable parabolic cylindrical antenna is taken as the research object, and the problem of unfolding process instability of cylindrical antenna is studied in the paper, which is caused by multiple factors such as multiple closed loops, elastic deformation, motion friction, and gap collision. Firstly, the multi-flexible system dynamics model of large-scale parabolic cylindrical antenna is established to study the influence of friction and elastic deformation on the stability of large multi-closed loop antenna. Secondly, the evaluation method of antenna expansion stability is studied, and the quantitative index of antenna configuration design is proposed to provide a theoretical basis for improving the overall performance of the antenna. Finally, through simulation analysis and experiment, the development dynamics and stability of large-scale parabolic cylindrical antennas are verified by in-depth analysis, and the principles for improving the stability of antenna deployment are summarized. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=multibody%20dynamics" title="multibody dynamics">multibody dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=expandable%20parabolic%20cylindrical%20antenna" title=" expandable parabolic cylindrical antenna"> expandable parabolic cylindrical antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=stability" title=" stability"> stability</a>, <a href="https://publications.waset.org/abstracts/search?q=flexible%20deformation" title=" flexible deformation"> flexible deformation</a> </p> <a href="https://publications.waset.org/abstracts/112968/study-on-the-stability-of-large-space-expandable-parabolic-cylindrical-antenna" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/112968.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">146</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">353</span> Numerical Model Validation Using Durbin Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Al-Hajeri">H. Al-Hajeri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The computation of the effectiveness of turbulence enhancement surface features, such as ribs as means of promoting mixing and hence heat transfer, has attracted the continued attention of the engineering community. In this study, the simulation of a three-dimensional cooling passage is carried out employing a number of turbulence models including Durbin model. The cooling passage consists of a square section duct whose upper and lower surfaces feature staggered cuboid ribs. The main objective of this paper is to provide comparisons of the performance of the v2-f model against other established turbulence models as implemented in the commercial CFD code Ansys Fluent. The present study demonstrates that the v2-f model can successfully capture the isothermal air flow phenomena in flow over obstacles. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=CFD" title="CFD">CFD</a>, <a href="https://publications.waset.org/abstracts/search?q=cooling%20passage" title=" cooling passage"> cooling passage</a>, <a href="https://publications.waset.org/abstracts/search?q=Durbin%20model" title=" Durbin model"> Durbin model</a>, <a href="https://publications.waset.org/abstracts/search?q=turbulence%20model" title=" turbulence model"> turbulence model</a> </p> <a href="https://publications.waset.org/abstracts/30295/numerical-model-validation-using-durbin-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30295.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">503</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">352</span> Robust Segmentation of Salient Features in Automatic Breast Ultrasound (ABUS) Images</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Lamees%20Nasser">Lamees Nasser</a>, <a href="https://publications.waset.org/abstracts/search?q=Yago%20Diez"> Yago Diez</a>, <a href="https://publications.waset.org/abstracts/search?q=Robert%20Mart%C3%AD"> Robert Martí</a>, <a href="https://publications.waset.org/abstracts/search?q=Joan%20Mart%C3%AD"> Joan Martí</a>, <a href="https://publications.waset.org/abstracts/search?q=Ibrahim%20Sadek"> Ibrahim Sadek</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Automated 3D breast ultrasound (ABUS) screening is a novel modality in medical imaging because of its common characteristics shared with other ultrasound modalities in addition to the three orthogonal planes (i.e., axial, sagittal, and coronal) that are useful in analysis of tumors. In the literature, few automatic approaches exist for typical tasks such as segmentation or registration. In this work, we deal with two problems concerning ABUS images: nipple and rib detection. Nipple and ribs are the most visible and salient features in ABUS images. Determining the nipple position plays a key role in some applications for example evaluation of registration results or lesion follow-up. We present a nipple detection algorithm based on color and shape of the nipple, besides an automatic approach to detect the ribs. In point of fact, rib detection is considered as one of the main stages in chest wall segmentation. This approach consists of four steps. First, images are normalized in order to minimize the intensity variability for a given set of regions within the same image or a set of images. Second, the normalized images are smoothed by using anisotropic diffusion filter. Next, the ribs are detected in each slice by analyzing the eigenvalues of the 3D Hessian matrix. Finally, a breast mask and a probability map of regions detected as ribs are used to remove false positives (FP). Qualitative and quantitative evaluation obtained from a total of 22 cases is performed. For all cases, the average and standard deviation of the root mean square error (RMSE) between manually annotated points placed on the rib surface and detected points on rib borders are 15.1188 mm and 14.7184 mm respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Automated%203D%20Breast%20Ultrasound" title="Automated 3D Breast Ultrasound">Automated 3D Breast Ultrasound</a>, <a href="https://publications.waset.org/abstracts/search?q=Eigenvalues%20of%20Hessian%20matrix" title=" Eigenvalues of Hessian matrix"> Eigenvalues of Hessian matrix</a>, <a href="https://publications.waset.org/abstracts/search?q=Nipple%20detection" title=" Nipple detection"> Nipple detection</a>, <a href="https://publications.waset.org/abstracts/search?q=Rib%20detection" title=" Rib detection"> Rib detection</a> </p> <a href="https://publications.waset.org/abstracts/41104/robust-segmentation-of-salient-features-in-automatic-breast-ultrasound-abus-images" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/41104.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">330</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">351</span> Investigation of Permeate Flux through DCMD Module by Inserting S-Ribs Carbon-Fiber Promoters with Ascending and Descending Hydraulic Diameters</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chii-Dong%20Ho">Chii-Dong Ho</a>, <a href="https://publications.waset.org/abstracts/search?q=Jian-Har%20Chen"> Jian-Har Chen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The decline in permeate flux across membrane modules is attributed to the increase in temperature polarization resistance in flat-plate Direct Contact Membrane Distillation (DCMD) modules for pure water productivity. Researchers have discovered that this effect can be diminished by embedding turbulence promoters, which augment turbulence intensity at the cost of increased power consumption, thereby improving vapor permeate flux. The device performance of DCMD modules for permeate flux was further enhanced by shrinking the hydraulic diameters of inserted S-ribs carbon-fiber promoters as well as considering the energy consumption increment. The mass-balance formulation, based on the resistance-in-series model by energy conservation in one-dimensional governing equations, was developed theoretically and conducted experimentally on a flat-plate polytetrafluoroethylene/polypropylene (PTFE/PP) membrane module to predict permeate flux and temperature distributions. The ratio of permeate flux enhancement to energy consumption increment, as referred to an assessment on economic viewpoint and technical feasibilities, was calculated to determine the suitable design parameters for DCMD operations with the insertion of S-ribs carbon-fiber turbulence promoters. An economic analysis was also performed, weighing both permeate flux improvement and energy consumption increment on modules with promoter-filled channels by different array configurations and various hydraulic diameters of turbulence promoters. Results showed that the ratio of permeate flux improvement to energy consumption increment in descending hydraulic-diameter modules is higher than in uniform hydraulic-diameter modules. The fabrication details of the DCMD module filaments implementing the S-ribs carbon-fiber filaments and the schematic configuration of the flat-plate DCMD experimental setup with presenting acrylic plates as external walls were demonstrated in the present study. The S-ribs carbon fibers perform as turbulence promoters incorporated into the artificial hot saline feed stream, which was prepared by adding inorganic salts (NaCl) to distilled water. Theoretical predictions and experimental results exhibited a great accomplishment to considerably achieve permeate flux enhancement, such as the new design of the DCMD module with inserting S-ribs carbon-fiber promoters. Additionally, the Nusselt number for the water vapor transferring membrane module with inserted S-ribs carbon-fiber promoters was generalized into a simplified expression to predict the heat transfer coefficient and permeate flux as well. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=permeate%20flux" title="permeate flux">permeate flux</a>, <a href="https://publications.waset.org/abstracts/search?q=Nusselt%20number" title=" Nusselt number"> Nusselt number</a>, <a href="https://publications.waset.org/abstracts/search?q=DCMD%20module" title=" DCMD module"> DCMD module</a>, <a href="https://publications.waset.org/abstracts/search?q=temperature%20polarization" title=" temperature polarization"> temperature polarization</a>, <a href="https://publications.waset.org/abstracts/search?q=hydraulic%20diameters" title=" hydraulic diameters"> hydraulic diameters</a> </p> <a href="https://publications.waset.org/abstracts/194162/investigation-of-permeate-flux-through-dcmd-module-by-inserting-s-ribs-carbon-fiber-promoters-with-ascending-and-descending-hydraulic-diameters" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/194162.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">8</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">350</span> Vibrational Behavior of Cylindrical Shells in Axial Magnetic Field</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sedrak%20Vardanyan">Sedrak Vardanyan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The investigation of the vibrational character of magnetic cylindrical shells placed in an axial magnetic field has important practical applications. In this work, we study the vibrational behaviour of such a cylindrical shell by making use of the so-called exact space treatment, which does not assume any hypothesis. We discuss the effects of several practically important boundary conditions on the vibrations of the described setup. We find that, for some cases of boundary conditions, e.g. clamped, simply supported or peripherally earthed, as well as for some values of the wave numbers, the vibrational frequencies of the shell are approximately zero. The theoretical and numerical exploration of this fact confirms that the vibrations are absent or attenuate very rapidly. For all the considered cases, the imaginary part of the frequencies is negative, which implies stability for the vibrational process. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bending%20vibrational%20frequencies" title="bending vibrational frequencies">bending vibrational frequencies</a>, <a href="https://publications.waset.org/abstracts/search?q=exact%20space%20treatment" title=" exact space treatment"> exact space treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=free%20vibrations" title=" free vibrations"> free vibrations</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20cylindrical%20shells" title=" magnetic cylindrical shells"> magnetic cylindrical shells</a> </p> <a href="https://publications.waset.org/abstracts/65224/vibrational-behavior-of-cylindrical-shells-in-axial-magnetic-field" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/65224.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">279</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">349</span> CFD Simulation for Thermo-Hydraulic Performance V-Shaped Discrete Ribs on the Absorber Plate of Solar Air Heater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20L.%20Bhagoria">J. L. Bhagoria</a>, <a href="https://publications.waset.org/abstracts/search?q=Ajeet%20Kumar%20Giri"> Ajeet Kumar Giri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A computational investigation of various flow characteristics with artificial roughness in the form of V-types discrete ribs, heated wall of rectangular duct for turbulent flow with Reynolds number range (3800-15000) and p/e (5 to 12) has been carried out with k-e turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in literature. The current study evaluates thermal performance behavior, heat transfer and fluid flow behavior in a v shaped duct with discrete roughened ribs mounted on one of the principal wall (solar plate) by computational fluid dynamics software (Fluent 6.3.26 Solver). In this study, CFD has been carried out through designing 3-demensional model of experimental solar air heater model analysis has been used to perform a numerical simulation to enhance turbulent heat transfer and Reynolds-Averaged Navier–Stokes analysis is used as a numerical technique and the k-epsilon model with near-wall treatment as a turbulent model. The thermal efficiency enhancement because of selected roughness is found to be 16-24%. The result predicts a significant enhancement of heat transfer as compared to that of for a smooth surface with different P’ and various range of Reynolds number. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=CFD" title="CFD">CFD</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20collector" title=" solar collector"> solar collector</a>, <a href="https://publications.waset.org/abstracts/search?q=airheater" title=" airheater"> airheater</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20efficiency" title=" thermal efficiency"> thermal efficiency</a> </p> <a href="https://publications.waset.org/abstracts/47346/cfd-simulation-for-thermo-hydraulic-performance-v-shaped-discrete-ribs-on-the-absorber-plate-of-solar-air-heater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47346.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">290</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">348</span> Modelling of Creep in a Thick-Walled Cylindrical Vessel Subjected to Internal Pressure</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tejeet%20Singh">Tejeet Singh</a>, <a href="https://publications.waset.org/abstracts/search?q=Ishvneet%20Singh"> Ishvneet Singh</a>, <a href="https://publications.waset.org/abstracts/search?q=Vinay%20Gupta"> Vinay Gupta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present study focussed on carrying out the creep analysis in an isotropic thick-walled composite cylindrical pressure vessel composed of aluminium matrix reinforced with silicon-carbide in particulate form. The creep behaviour of the composite material has been described by the threshold stress based creep law. The value of stress exponent appearing in the creep law was selected as 3, 5 and 8. The constitutive equations were developed using well known von-Mises yield criteria. Models were developed to find out the distributions of creep stresses and strain rate in thick-walled composite cylindrical pressure vessels under internal pressure. In order to obtain the stress distributions in the cylinder, the equilibrium equation of the continuum mechanics and the constitutive equations are solved together. It was observed that the radial stress, tangential stress and axial stress increases along with the radial distance. The cross-over was also obtained almost at the middle region of cylindrical vessel for tangential and axial stress for different values of stress exponent. The strain rates were also decreasing in nature along the entire radius. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=creep" title="creep">creep</a>, <a href="https://publications.waset.org/abstracts/search?q=composite" title=" composite"> composite</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20vessel" title=" cylindrical vessel"> cylindrical vessel</a>, <a href="https://publications.waset.org/abstracts/search?q=internal%20pressure" title=" internal pressure"> internal pressure</a> </p> <a href="https://publications.waset.org/abstracts/23762/modelling-of-creep-in-a-thick-walled-cylindrical-vessel-subjected-to-internal-pressure" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23762.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">577</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">347</span> Cold Flow Investigation of Silicon Carbide Cylindrical Filter Element</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Alhajeri">Mohammad Alhajeri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper reports a computational fluid dynamics (CFD) investigation of cylindrical filter. Silicon carbide cylindrical filter elements have proven to be an effective mean of removing particulates to levels exceeding the new source performance standard. The CFD code is used here to understand the deposition process and the factors that affect the particles distribution over the filter element surface. Different approach cross flow velocity to filter face velocity ratios and different face velocities (ranging from 2 to 5 cm/s) are used in this study. Particles in the diameter range 1 to 100 microns are tracked through the domain. The radius of convergence (or the critical trajectory) is compared and plotted as a function of many parameters. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=filtration" title="filtration">filtration</a>, <a href="https://publications.waset.org/abstracts/search?q=CFD" title=" CFD"> CFD</a>, <a href="https://publications.waset.org/abstracts/search?q=CCF" title=" CCF"> CCF</a>, <a href="https://publications.waset.org/abstracts/search?q=hot%20gas%20filtration" title=" hot gas filtration"> hot gas filtration</a> </p> <a href="https://publications.waset.org/abstracts/36492/cold-flow-investigation-of-silicon-carbide-cylindrical-filter-element" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36492.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">461</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">346</span> Annular Axi-Symmetric Stagnation Flow of Electrically Conducting Fluid on a Moving Cylinder in the Presence of Axial Magnetic Field</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Deva%20Kanta%20Phukan">Deva Kanta Phukan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An attempt is made where an electrically conducting fluid is injected from a fixed outer cylindrical casing onto an inner moving cylindrical rod. A magnetic field is applied parallel to the axis of the cylindrical rod. The basic governing set of partial differential equations for conservation of mass and momentum are reduced to a set of non-linear ordinary differential equation by introducing similarity transformation, which are integrated numerically. A perturbation solution for the case of large magnetic parameter is derived for constant Reynolds number. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=annular%20axi-symmetric%20stagnation%20flow" title="annular axi-symmetric stagnation flow">annular axi-symmetric stagnation flow</a>, <a href="https://publications.waset.org/abstracts/search?q=conducting%20fluid" title=" conducting fluid"> conducting fluid</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20field" title=" magnetic field"> magnetic field</a>, <a href="https://publications.waset.org/abstracts/search?q=moving%20cylinder" title=" moving cylinder"> moving cylinder</a> </p> <a href="https://publications.waset.org/abstracts/16810/annular-axi-symmetric-stagnation-flow-of-electrically-conducting-fluid-on-a-moving-cylinder-in-the-presence-of-axial-magnetic-field" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/16810.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">400</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">345</span> Research on Configuration of Large-Scale Linear Array Feeder Truss Parabolic Cylindrical Antenna of Satellite</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chen%20Chuanzhi">Chen Chuanzhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Guo%20Yunyun"> Guo Yunyun</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The large linear array feeding parabolic cylindrical antenna of the satellite has the ability of large-area line focusing, multi-directional beam clusters simultaneously in a certain azimuth plane and elevation plane, corresponding quickly to different orientations and different directions in a wide frequency range, dual aiming of frequency and direction, and combining space power. Therefore, the large-diameter parabolic cylindrical antenna has become one of the new development directions of spaceborne antennas. Limited by the size of the rocked fairing, the large-diameter spaceborne antenna is required to be small mass and have a deployment function. After being orbited, the antenna can be deployed by expanding and be stabilized. However, few types of structures can be used to construct large cylindrical shell structures in existing structures, which greatly limits the development and application of such antennas. Aiming at high structural efficiency, the geometrical characteristics of parabolic cylinders and mechanism topological mapping law to the expandable truss are studied, and the basic configuration of deployable truss with cylindrical shell is structured. Then a modular truss parabolic cylindrical antenna is designed in this paper. The antenna has the characteristics of stable structure, high precision of reflecting surface formation, controllable motion process, high storage rate, and lightweight, etc. On the basis of the overall configuration comprehensive theory and optimization method, the structural stiffness of the modular truss parabolic cylindrical antenna is improved. And the bearing density and impact resistance of support structure are improved based on the internal tension optimal distribution method of reflector forming. Finally, a truss-type cylindrical deployable support structure with high constriction-deployment ratio, high stiffness, controllable deployment, and low mass is successfully developed, laying the foundation for the application of large-diameter parabolic cylindrical antennas in satellite antennas. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=linear%20array%20feed%20antenna" title="linear array feed antenna">linear array feed antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=truss%20type" title=" truss type"> truss type</a>, <a href="https://publications.waset.org/abstracts/search?q=parabolic%20cylindrical%20antenna" title=" parabolic cylindrical antenna"> parabolic cylindrical antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=spaceborne%20antenna" title=" spaceborne antenna"> spaceborne antenna</a> </p> <a href="https://publications.waset.org/abstracts/108903/research-on-configuration-of-large-scale-linear-array-feeder-truss-parabolic-cylindrical-antenna-of-satellite" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108903.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">158</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">344</span> Numerical Investigation of Heat Transfer Characteristics of Different Rib Shapes in a Gas Turbine Blade</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Naik%20Nithesh">Naik Nithesh</a>, <a href="https://publications.waset.org/abstracts/search?q=Andre%20Rozek"> Andre Rozek</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The heat transfer and friction loss performances of a single rib-roughened rectangular cooling channel having four novel rib shapes were evaluated through numerical investigation using Ansys CFX. The investigation was conducted on a rectangular channel of aspect ratio (AR) = 4:1 with rib height to hydraulic diameter ratio (e/Dh) of 0.1 and rib pitch to height ratio (e/P) of 10 at Re = 30,000. The computations were performed by solving the RANS equation using k-ε turbulence model. Fluid flow simulation results of stationery case for different configuration are presented in terms of thermal performance parameter, Nusselt number and friction factor. These parameters indicate that a particular configuration of novel shaped ribs provides better heat transfer characteristics over the conventional 45° ribs. The numerical investigation undertaken in this study indicates an increase in overall efficiency of gas turbine due to increased thermal performance parameter, heat transfer co-efficient and less pumping pressure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gas%20turbine" title="gas turbine">gas turbine</a>, <a href="https://publications.waset.org/abstracts/search?q=rib%20shapes" title=" rib shapes"> rib shapes</a>, <a href="https://publications.waset.org/abstracts/search?q=nusselt%20number" title=" nusselt number"> nusselt number</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20performance%20parameter" title=" thermal performance parameter"> thermal performance parameter</a> </p> <a href="https://publications.waset.org/abstracts/19812/numerical-investigation-of-heat-transfer-characteristics-of-different-rib-shapes-in-a-gas-turbine-blade" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19812.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">518</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">343</span> Effect of Installation of Long Cylindrical External Store on Performance, Stability, Control and Handling Qualities of Light Transport Aircraft</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ambuj%20Srivastava">Ambuj Srivastava</a>, <a href="https://publications.waset.org/abstracts/search?q=Narender%20Singh"> Narender Singh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents the effect of installation of cylindrical external store on the performance, stability, control and handling qualities of light transport category aircraft. A pair of long cylindrical store was installed symmetrically on either side of the fuselage (port and starboard) ahead of the wing and below the fuselage bottom surface running below pilot and co-pilot window. The cylindrical store was installed as hanging from aircraft surface through specially designed brackets. The adjoining structure was sufficiently reinforced for bearing aerodynamic loads. The length to diameter ratio of long cylindrical store was ~20. Based on academic studies and flow simulation analysis, a considerable detrimental effect on single engine second segment climb performance was found which was later validated through extensive flight testing exercise. The methodology of progressive flight envelope opening was adopted. The certification was sought from Regional airworthiness authorities and for according approval. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=second%20segment%20climb" title="second segment climb">second segment climb</a>, <a href="https://publications.waset.org/abstracts/search?q=maximum%20operating%20speed" title=" maximum operating speed"> maximum operating speed</a>, <a href="https://publications.waset.org/abstracts/search?q=cruise%20performance%20%28single%20engine%20and%20twin%20engine%29" title=" cruise performance (single engine and twin engine)"> cruise performance (single engine and twin engine)</a>, <a href="https://publications.waset.org/abstracts/search?q=minimum%20control%20speed" title=" minimum control speed"> minimum control speed</a>, <a href="https://publications.waset.org/abstracts/search?q=and%20additional%20trim%20required" title=" and additional trim required"> and additional trim required</a> </p> <a href="https://publications.waset.org/abstracts/42474/effect-of-installation-of-long-cylindrical-external-store-on-performance-stability-control-and-handling-qualities-of-light-transport-aircraft" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42474.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">233</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">342</span> Effect of Control Lasers Polarization on Absorption Coefficient and Refractive Index of a W-Type 4- Level Cylindrical Quantum Dot in the Presence Of Electromagnetically Induced Transparency (ETI)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Marziehossadat%20Moezzi">Marziehossadat Moezzi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, electromagnetically induced transparency (EIT) is investigated in a cylindrical quantum dot (QD) with a parabolic confinement potential. We study the effect of control lasers polarization on absorption coefficient, refractive index and also on the generation of the double transparency windows in this system. Considering an effective mass method, the time-independent Schrödinger equation is solved to obtain the energy structure of the QD. Also, we study the effect of structural characteristics of the QD on refraction and absorption of the QD in the presence of EIT. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electromagnetically%20induced%20transparency" title="electromagnetically induced transparency">electromagnetically induced transparency</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20quantum%20dot" title=" cylindrical quantum dot"> cylindrical quantum dot</a>, <a href="https://publications.waset.org/abstracts/search?q=absorption%20coefficient" title=" absorption coefficient"> absorption coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=refractive%20index" title=" refractive index"> refractive index</a> </p> <a href="https://publications.waset.org/abstracts/140374/effect-of-control-lasers-polarization-on-absorption-coefficient-and-refractive-index-of-a-w-type-4-level-cylindrical-quantum-dot-in-the-presence-of-electromagnetically-induced-transparency-eti" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/140374.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">198</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">341</span> Analysis of Soft and Hard X-Ray Intensities Using Different Shapes of Anodes in a 4kJ Mather Type Plasma Focus Facility</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mahsa%20Mahtab">Mahsa Mahtab</a>, <a href="https://publications.waset.org/abstracts/search?q=Morteza%20Habibi"> Morteza Habibi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of different anode tip geometries on the intensity of soft and hard x-ray emitted from a 4 kJ plasma focus device is investigated. For this purpose, 5 different anode tips are used. The shapes of the uppermost region of these anodes have been cylindrical-flat, cylindrical-hollow, spherical-convex, cone-flat and cone-hollow. Analyzed data have shown that cone-flat, spherical-convex and cone-hollow anodes significantly increase X-ray intensity respectively in comparison with cylindrical-flat anode; while the cylindrical-hollow tip decreases. Anode radius reduction at its end in conic or spherical anodes enhance SXR by increasing plasma density through collecting a greater mass of gas and more gradual transition phase to form a more stable dense plasma pinch. Also, HXR is enhanced by increasing the energy of electrons colliding with the anode surface through raise of induced electrical field. Finally, the cone-flat anode is introduced to use in cases in which the plasma focus device is used as an X-ray source due to its highest yield of X-ray emissions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=plasma%20focus" title="plasma focus">plasma focus</a>, <a href="https://publications.waset.org/abstracts/search?q=anode%20tip" title=" anode tip"> anode tip</a>, <a href="https://publications.waset.org/abstracts/search?q=HXR" title=" HXR"> HXR</a>, <a href="https://publications.waset.org/abstracts/search?q=SXR" title=" SXR"> SXR</a>, <a href="https://publications.waset.org/abstracts/search?q=pinched%20plasma" title=" pinched plasma"> pinched plasma</a> </p> <a href="https://publications.waset.org/abstracts/30370/analysis-of-soft-and-hard-x-ray-intensities-using-different-shapes-of-anodes-in-a-4kj-mather-type-plasma-focus-facility" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30370.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">400</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">340</span> The Light-Effect in Cylindrical Quantum Wire with an Infinite Potential for the Case of Electrons: Optical Phonon Scattering</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hoang%20Van%20Ngoc">Hoang Van Ngoc</a>, <a href="https://publications.waset.org/abstracts/search?q=Nguyen%20Vu%20Nhan"> Nguyen Vu Nhan</a>, <a href="https://publications.waset.org/abstracts/search?q=Nguyen%20Quang%20Bau"> Nguyen Quang Bau</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The light-effect in cylindrical quantum wire with an infinite potential for the case of electrons, optical phonon scattering, is studied based on the quantum kinetic equation. The density of the direct current in a cylindrical quantum wire by a linearly polarized electromagnetic wave, a DC electric field, and an intense laser field is calculated. Analytic expressions for the density of the direct current are studied as a function of the frequency of the laser radiation field, the frequency of the linearly polarized electromagnetic wave, the temperature of system, and the size of quantum wire. The density of the direct current in cylindrical quantum wire with an infinite potential for the case of electrons – optical phonon scattering is nonlinearly dependent on the frequency of the linearly polarized electromagnetic wave. The analytic expressions are numerically evaluated and plotted for a specific quantum wire, GaAs/GaAsAl. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=the%20light%E2%80%93effect" title="the light–effect">the light–effect</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20quantum%20wire%20with%20an%20infinite%20potential" title=" cylindrical quantum wire with an infinite potential"> cylindrical quantum wire with an infinite potential</a>, <a href="https://publications.waset.org/abstracts/search?q=the%20density%20of%20the%20direct%20current" title=" the density of the direct current"> the density of the direct current</a>, <a href="https://publications.waset.org/abstracts/search?q=electrons-optical%20phonon%20scattering" title=" electrons-optical phonon scattering"> electrons-optical phonon scattering</a> </p> <a href="https://publications.waset.org/abstracts/75022/the-light-effect-in-cylindrical-quantum-wire-with-an-infinite-potential-for-the-case-of-electrons-optical-phonon-scattering" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/75022.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">340</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">339</span> Thinned Elliptical Cylindrical Antenna Array Synthesis Using Particle Swarm Optimization</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rajesh%20Bera">Rajesh Bera</a>, <a href="https://publications.waset.org/abstracts/search?q=Durbadal%20Mandal"> Durbadal Mandal</a>, <a href="https://publications.waset.org/abstracts/search?q=Rajib%20Kar"> Rajib Kar</a>, <a href="https://publications.waset.org/abstracts/search?q=Sakti%20P.%20Ghoshal"> Sakti P. Ghoshal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper describes optimal thinning of an Elliptical Cylindrical Array (ECA) of uniformly excited isotropic antennas which can generate directive beam with minimum relative Side Lobe Level (SLL). The Particle Swarm Optimization (PSO) method, which represents a new approach for optimization problems in electromagnetic, is used in the optimization process. The PSO is used to determine the optimal set of ‘ON-OFF’ elements that provides a radiation pattern with maximum SLL reduction. Optimization is done without prefixing the value of First Null Beam Width (FNBW). The variation of SLL with element spacing of thinned array is also reported. Simulation results show that the number of array elements can be reduced by more than 50% of the total number of elements in the array with a simultaneous reduction in SLL to less than -27dB. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thinned%20array" title="thinned array">thinned array</a>, <a href="https://publications.waset.org/abstracts/search?q=Particle%20Swarm%20Optimization" title=" Particle Swarm Optimization"> Particle Swarm Optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=Elliptical%20Cylindrical%20Array" title=" Elliptical Cylindrical Array"> Elliptical Cylindrical Array</a>, <a href="https://publications.waset.org/abstracts/search?q=Side%20Lobe%20Label." title=" Side Lobe Label."> Side Lobe Label.</a> </p> <a href="https://publications.waset.org/abstracts/4068/thinned-elliptical-cylindrical-antenna-array-synthesis-using-particle-swarm-optimization" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/4068.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">443</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">338</span> Yield Onset of Thermo-Mechanical Loading of FGM Thick Walled Cylindrical Pressure Vessels</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Ansari%20Sadrabadi">S. Ansari Sadrabadi</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20H.%20Rahimi"> G. H. Rahimi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, thick walled Cylindrical tanks or tubes made of functionally graded material under internal pressure and temperature gradient are studied. Material parameters have been considered as power functions. They play important role in the elastoplastic behavior of these materials. To clarify their role, different materials with different parameters have been used under temperature gradient. Finally, their effect and loading effect have been determined in first yield point. Also, the important role of temperature gradient was also shown. At the end the study has been results obtained from changes in the elastic modulus and yield stress. Also special attention is also given to the effects of this internal pressure and temperature gradient in the creation of tensile and compressive stresses. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=FGM" title="FGM">FGM</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20pressure%20tubes" title=" cylindrical pressure tubes"> cylindrical pressure tubes</a>, <a href="https://publications.waset.org/abstracts/search?q=small%20deformation%20theory" title=" small deformation theory"> small deformation theory</a>, <a href="https://publications.waset.org/abstracts/search?q=yield%20onset" title=" yield onset"> yield onset</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20loading" title=" thermal loading"> thermal loading</a> </p> <a href="https://publications.waset.org/abstracts/10627/yield-onset-of-thermo-mechanical-loading-of-fgm-thick-walled-cylindrical-pressure-vessels" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/10627.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">419</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">337</span> Optimal Design of Composite Cylindrical Shell Based on Nonlinear Finite Element Analysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Haider%20M.%20Alsaeq">Haider M. Alsaeq</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present research is an attempt to figure out the best configuration of composite cylindrical shells of the sandwich type, i.e. the lightest design of such shells required to sustain a certain load over a certain area. The optimization is based on elastic-plastic geometrically nonlinear incremental-iterative finite element analysis. The nine-node degenerated curved shell element is used in which five degrees of freedom are specified at each nodal point, with a layered model. The formulation of the geometrical nonlinearity problem is carried out using the well-known total Lagrangian principle. For the structural optimization problem, which is dealt with as a constrained nonlinear optimization, the so-called Modified Hooke and Jeeves method is employed by considering the weight of the shell as the objective function with stress and geometrical constraints. It was concluded that the optimum design of composite sandwich cylindrical shell that have a rigid polyurethane foam core and steel facing occurs when the area covered by the shell becomes almost square with a ratio of core thickness to facing thickness lies between 45 and 49, while the optimum height to length ration varies from 0.03 to 0.08 depending on the aspect ratio of the shell and its boundary conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=composite%20structure" title="composite structure">composite structure</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20shell" title=" cylindrical shell"> cylindrical shell</a>, <a href="https://publications.waset.org/abstracts/search?q=optimization" title=" optimization"> optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=non-linear%20analysis" title=" non-linear analysis"> non-linear analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element" title=" finite element"> finite element</a> </p> <a href="https://publications.waset.org/abstracts/11228/optimal-design-of-composite-cylindrical-shell-based-on-nonlinear-finite-element-analysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11228.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">391</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">336</span> Mathematical Model for Output Yield Obtained by Single Slope Solar Still</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=V.%20Nagaraju">V. Nagaraju</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Murali"> G. Murali</a>, <a href="https://publications.waset.org/abstracts/search?q=Nagarjunavarma%20Ganna"> Nagarjunavarma Ganna</a>, <a href="https://publications.waset.org/abstracts/search?q=Atluri%20Pavan%20Kalyan"> Atluri Pavan Kalyan</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Sree%20Sai%20Ganesh"> N. Sree Sai Ganesh</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20S.%20V.%20S.%20Badrinath"> V. S. V. S. Badrinath</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present work focuses on the development of a mathematical model for the yield obtained by single slope solar still incorporated with cylindrical pipes filled with sand. The mathematical results obtained were validated with the experimental results for the 3 cm of water level at the basin. The mathematical model and results obtained with the experimental investigation are within 11% of deviation. The theoretical model to predict the yield obtained due to the capillary effect was proposed first. And then, to predict the total yield obtained, the thermal effect model was integrated with the capillary effect model. With the obtained results, it is understood that the yield obtained is more in the case of solar stills with sand-filled cylindrical pipes when compared to solar stills without sand-filled cylindrical pipes. And later model was used for predicting yield for 1 cm and 2 cm of water levels at the basin. And it is observed that the maximum yield was obtained for a 1 cm water level at the basin. It means solar still produces better yield with the lower depth of water level at the basin; this may be because of the availability of more space in the sand for evaporation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=solar%20still" title="solar still">solar still</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20pipes" title=" cylindrical pipes"> cylindrical pipes</a>, <a href="https://publications.waset.org/abstracts/search?q=still%20efficiency" title=" still efficiency"> still efficiency</a>, <a href="https://publications.waset.org/abstracts/search?q=mathematical%20modeling" title=" mathematical modeling"> mathematical modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=capillary%20effect%20model" title=" capillary effect model"> capillary effect model</a>, <a href="https://publications.waset.org/abstracts/search?q=yield" title=" yield"> yield</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20desalination" title=" solar desalination"> solar desalination</a> </p> <a href="https://publications.waset.org/abstracts/132116/mathematical-model-for-output-yield-obtained-by-single-slope-solar-still" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/132116.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">119</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=cylindrical%20ribs&page=2">2</a></li> <li class="page-item"><a class="page-link" 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