Defect and Diffusion Forum Vol. 415

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on-hover-arrow-left-red"></i> </div> </div> </a> </div> </div> <div class="right-content col-md-8 col-sm-7 col-xs-12"> <div class="bread-crumbs hidden-xs"> <a class="bread-crumbs-first" href="/">Home</a><i class="inline-icon arrow-breadcrumbs"></i><a class="bread-crumbs-first" href="/DDF">Defect and Diffusion Forum</a><i class="inline-icon arrow-breadcrumbs"></i><span class="bread-crumbs-second">Defect and Diffusion Forum Vol. 415</span></div> <div class="page-name-block underline-begin"> <h1 class="page-name-block-text">Defect and Diffusion Forum Vol. 415</h1> </div> <div class="clearfix title-details"> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>DOI:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="https://doi.org/10.4028/v-p2e31i">https://doi.org/10.4028/v-p2e31i</a></p> </div> </div> </div> </div> <div id="titleMarcXmlLink" style="display: none" class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>Export:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.415/marc.xml">MARCXML</a></p> </div> </div> </div> </div> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>ToC:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.415_toc.pdf">Table of Contents</a></p> </div> </div> </div> </div> </div> <div class="volume-tabs"> </div> <div class=""> <div class="volume-papers-page"> <div class="block-search-pagination clearfix"> <div class="block-search-volume"> <input id="paper-search" type="search" placeholder="Search" maxlength="65"> </div> </div> <div class="block-volume-title normal-text-gray"> <p> Paper Title <span>Page</span> </p> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.3">Thermophoretic and Suction/blowing Effects on MHD Mixed Convection Flow over an Inclined Plate Combined with Heat Generation, Chemical Reaction and Radiation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Boualem Khemissat, Amina Manel Bouaziz, M.N. Bouaziz </div> </div> <div id="abstractTextBlock550007" class="volume-info volume-info-text volume-info-description"> Abstract: This paper examined the thermophoresis effect and suction/injection process on steady MHD in a semi-infinite inclined porous plate. Chemical reaction, heat generation and thermal radiation are taking into account. The governing partial diﬀerential equations are transformed via similarity technique into a system of nonlinear ordinary diﬀerential similarity equations, which are solved numerically by applying the Lobbato IIIa-finite-difference method. Favorable comparisons with previously published work are performed. Numerical pertinent results for the velocity, temperature and concentration profiles as well as for the skin-friction coefficient, wall heat transfer and mass transfer rates are obtained and reported graphically for various parametric conditions to show interesting aspects of the solution. The main results are the dominant influence of suction/injection process to control the principal boundary layers and the role played by the combined chemical reaction, heat generation and thermal radiation on the changes in the quantities of interest. </div> <div> <a data-readmore="{ block: '#abstractTextBlock550007', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 3 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.21">Entropy Generation Minimization for Radiative Casson Fluid Flow through Permeable Walls and Convective Heating: A Comprehensive Numerical Investigation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Adebowale Martins Obalalu, Adebayo Olusegun Ajala, Akintayo Oladimeji Akindele, Oluwasanjo Adisa Areo, Saheed Dolapo Ogundiran, Kafilat Adebimpe Salaudeen, Saheed Alao </div> </div> <div id="abstractTextBlock575077" class="volume-info volume-info-text volume-info-description"> Abstract: Entropy generation minimization is a method that helps to improve the efficiency of real processes and devices. This study investigates the heat transfer in an electrically conducting Casson fluid flow between parallel plates under the influence of thermal radiation and convective boundary conditions. The thermodynamics first and second laws were employed to examine the problem. The present study provides a fast convergent method on the finite parallel plates, namely the Optimal Homotopy Analysis method (OHAM) and Collocation Method (CM) are used to analyzes the fluid flow, heat, transport. The impacts of governing parameters on Casson flow velocity, temperature profile, local skin friction, and Nusselt number were analysed. The obtained solutions were used to determine the heat transfer irreversibility and bejan number of the model. The method employed in this paper offers excellently convergence solutions with good accuracy. The results of the computation show that the effect of thermophysical properties such as thermal radiation parameter, suction/injection parameter, magnetic field parameter, radiation parameter, and Eckert number has a significant influence on Skin friction coefficient (Cf) and local Nusselt number (Nu) when compared to the Newtonian fluid. The application of this work can be found in polymer synthesis, metallic processing, and electromagnetic crucible systems. </div> <div> <a data-readmore="{ block: '#abstractTextBlock575077', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 21 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.39">Temperature Distribution Comparison in Smooth and Stepped Functions</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Ramoshweu Solomon Lebelo, Willfried Barros, Saheed Ojo Akindeinde </div> </div> <div id="abstractTextBlock582606" class="volume-info volume-info-text volume-info-description"> Abstract: In this article the distribution of temperature in both smooth and stepped functions is compared. The study uses a model of one dimensional <i>N</i>-cross-sections domain of a vase shaped medium, where approximation of the solution in the first case uses smooth functions, and in the second one, stepped functions. The temperature distribution is described by heat equation. Analysis of temperature distribution in both cases is based on finding eigenvalues and their corresponding eigen-functions which satisfy boundary conditions at given endpoints. Mathcad software was applied to determine the eigenvalues and their corresponding eigen-functions, together with the temperature distribution in the media of concern. The temperature distribution in both cases was found to be basically the same. The problem solution for each case is presented and an example of a one-dimensional vase shaped domain of length 4 units for each case is also given. </div> <div> <a data-readmore="{ block: '#abstractTextBlock582606', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 39 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.53">Effect of the Spacing Design of Two Alternate Baffles on the Performance of Heat Exchangers</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Jamal-Eddine Salhi, Kamal Amghar, Abdelkader Filali, Najim Salhi </div> </div> <div id="abstractTextBlock577629" class="volume-info volume-info-text volume-info-description"> Abstract: The present study investigates numerically the heat transfer process based forced convective flow of an incompressible fluid in a two-dimensional rectangular channel. Two baffles are imposed periodically on the lower and upper walls. The study mainly focused on the influence of the arrangement and spacing separating the baffles on the heat transfer's intensification. The values of the Reynolds number for the present turbulent flow regime were chosen in the range of 10<sup>4</sup> to 8.73 × 10<sup>4</sup>. The equations resulting from the three conservation laws, namely continuity, Navier-Stokes, and energy equations, are solved numerically based on the finite volume method. SIMPLE algorithm is used to overcome the pressure-velocity coupling, and k-ε model is used for the computation of turbulent patterns. Numerical simulations are carried out to study the dynamic and thermal behavior influenced by the control parameters. The physical quantities calculated are the axial velocity, the local, mean Nusselt numbers and the friction coefficient. The obtained results show that the friction coefficient decreases proportionally with the increase of Re number, and the local Nusselt number increases with the Reynolds number. As the spacing between the baffles decreases, the N<sub>R</sub> ratio increases, and as the Reynolds number increases, N<sub>R</sub> decreases N<sub>R</sub> = 6.13, 5.31, 4.62, and 4.30 for case P<sub>1</sub>, N<sub>R</sub> = 5.1, 4.5, 3.89, and 3.64, for case P<sub>2</sub>, N<sub>R</sub> = 5.00, 4.45, 8.83, and 3.51, for case P<sub>3</sub>, for equal Reynolds number, 10<sup>4</sup>, 2×10<sup>4</sup>, 4×10<sup>4</sup>, 8.73×10<sup>4</sup>, respectively. </div> <div> <a data-readmore="{ block: '#abstractTextBlock577629', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 53 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.73">Influence of Plaster Coating Thickness on the Thermal Behavior of Brick Masonry Walls</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Pedro Igor Bezerra Batista, Joaquin Humberto Aquino Rocha, Thamires C.M. de França, Fernando Palacios Galarza, Yêda Vieira Póvoas </div> </div> <div id="abstractTextBlock583642" class="volume-info volume-info-text volume-info-description"> Abstract: A ready-witted selection of high-quality construction materials for walls and roofs provides greater well-being and thermal comfort for building co-owners. It also reduces energy consumption with artificial conditioning appliances. This research aimed to analyze the thermal behavior of a ceramic brick masonry prototype composed of an external coating of Portland cement mortar and an internal plaster coating with variable thickness. Tests were carried out in a thermal chamber, and the temperatures were recorded by a non-contact thermographic camera and conduction thermocouples measuring equipment. Hence, the parameters obtained were fourfold: thermal resistance, thermal capacity, thermal transmittance, and thermal delay. The four latter were calculated as per the simplified method proposed in the Brazilian specification for Thermal performance in buildings (i.e., NBR 15220-1). As a result, the thicker plaster-coated block prototype showed a minor temperature variation during the heating process. Thus, the thickness of the plaster coating possesses a direct influence on the thermal response of the brick; The thicker the coating becomes, the better the thermal performance of the structural element. </div> <div> <a data-readmore="{ block: '#abstractTextBlock583642', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 73 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.81">Experimental Investigation of Air Bubble Curtain Effects on Water Wave Field</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Diogo R.C.B. Neves, Moisés Brito, António Alberto Pires-Silva, Conceição Juana Fortes, Jorge Matos </div> </div> <div id="abstractTextBlock567006" class="volume-info volume-info-text volume-info-description"> Abstract: This paper studies the effects of an air bubble curtain on surface water waves. Water particle velocities and free surface elevations were measured simultaneously at two cross-shore locations downstream of the air bubble curtain. Measurements were carried out for regular waves using different air bubble curtain configurations. Free surface elevations were measured using resistive gauges and the instantaneous velocities were acquired using an Acoustic Doppler Velocimeter (ADV). The characteristics of the free surface elevation time series, velocity field and turbulence are analyzed and discussed. The free surface elevation was found to be attenuated by the air bubble curtains. The phase averaged velocity profiles also depict the effect of the air bubbles in the flow field by generating milder longitudinal velocities (u) and by increasing the transverse component of the velocity (w). The increase in the turbulence intensity and the different energy spectrum produced by the air bubble curtain is also observed. The experimental results indicate that the thickness of the air bubble curtain and the total air flow rate affects the wave field. </div> <div> <a data-readmore="{ block: '#abstractTextBlock567006', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 81 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.103">Calculation and Experimental Method of Evaluation of Residual Working Resource of Reinforced Rods of Concrete Structures of Hydrotechnicalreinforced Structures</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Yu. V. Makarenko, Sergey Yu. Maksimov, Viktor Khoruzhiy </div> </div> <div id="abstractTextBlock583783" class="volume-info volume-info-text volume-info-description"> Abstract: The work carried out complex and systematic studies based on of which the causes of accidental destruction of reinforcement of reinforced concrete structures of hydraulic structures is established, which is that corrosion damage to metal reinforcement is accompanied by its active flooding and embrittlement, resulting in reduced material properties against corrosion and mechanical destruction of reinforced concrete structures, especially after 20-40 years of operation. Based on existing approaches to the assessment of ageing equipment, developed in various branches of mechanical engineering, including the construction industry, identified trends and shortcomings in determining the efficiency of metal structures and their residual life, in connection with which the calculation and experimental methods of using the criteria of crack resistance, sensitive to changes in the structure of the metal during long-term operation. It is established that the decrease in crack resistance characteristics in the surface layers of reinforcement of reinforced concrete structures in contact with the aggressive environment is caused by the degrading effect of hydrogen on the crystal structure of the metal. The calculated-experimental method is offered, allowing to carry out engineering forecast estimation of residual (working) resource of the reinforced concrete designs operated in corrosive-aggressive environments of hydraulic engineering constructions, which adequately reflects physical and mechanical processes in metal which occur during its long operation. </div> <div> <a data-readmore="{ block: '#abstractTextBlock583783', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 103 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.109">Using the Simplified Concrete Damage Plasticity Model in Studying the Penetration Depth in Concrete</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Xuan Bang Nguyen, Tri Ta Nguyen </div> </div> <div id="abstractTextBlock583075" class="volume-info volume-info-text volume-info-description"> Abstract: This paper, with the simplified concrete damage plasticity (SCDP) model, studying the penetration depth of steel projectile in the concrete block by Abaqus software. Comparing the results calculated by Abaqus software with the Modified NDRC formula to check the reliability of the computational model and material model. From there, studying the effect of concrete strength on penetration depth in concrete B20, B30, B40, B50. </div> <div> <a data-readmore="{ block: '#abstractTextBlock583075', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 109 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.115">Evaluation of Cyclic Tensile Stress Effect in Boiler Tube Failure</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Ariyana Dwiputra Nugraha </div> </div> <div id="abstractTextBlock583817" class="volume-info volume-info-text volume-info-description"> Abstract: Boiler is one of the critical parts and plays an important role in Steam Generation Power Plant. It transforms the chemical energy of fuel into heat or thermal energy. During plant operations, some problems occurred in the boiler and Superheater leakage is the heaviest problem that interfered the whole operations, and the units needed to stopped for maintenaces outages. Failure analysis is necessary to determine the cause of failure. Root Caused Failure Analysis methods was through mechanical tests in the laboratory, which is Visual Observation included Macrofractography Structure examination, Metallographic or Microstructure Examination, Hardness Test. The metallographic examination result shows that the microstructure of the base metal is ferrite pearlite, and there is no indication of microstructure changes in tube as effect from high operation temperature. Likewise, microstructure in the weld region is in normal conditions, no weld failure phenomenon. Hardness value for base metal, weld and HAZ area are still in a good condition. Macrofractrography structure examination shows that the fracture is in mechanical fatigue condition. Based on those results the source of the tube leak is not caused by operating errors, inside or outside deposit nor weld failure. Superheater tube failures caused by mechanical factors, namely due to cyclic tensile stress as result in vibration by gas flow coupled with an increase in the local area due to the welding heat, therefore, increases the rate of crack propagation. To verified the data from mechanical test, CFD simulation will be used. CFD can detect the direction of the gas flow around the Superheater tube. The simulation result shows the possibility of turbulence flow around the tube, which creates the vibrations on the tube due to gas flow velocity. Thus, the superheater tube leakage mostly because vibration that create cyclic tensile stress. </div> <div> <a data-readmore="{ block: '#abstractTextBlock583817', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 115 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.415.121">Effect of External Load on Stress Distribution of a Pipeline Subjected to Indentation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Faradilla F. Risnawati, Rachmat Sriwijaya </div> </div> <div id="abstractTextBlock585375" class="volume-info volume-info-text volume-info-description"> Abstract: Pipelines are widely used in industry for transporting oil and gas. Dents are one of the most common mechanical damage to pipelines due to external factors and significantly affect the performance of the pipelines. A dent is a permanent deformation of the circular cross-section of the pipelines. In this paper, numerical simulation using finite element analysis on API 5L X52 pipelines subjected to denting by a spherical indenter was carried out to determine the distribution of Von-Mises stress and permanent deformation. The given load was between the yield strength and ultimate strength of API 5L X52. The effect of indenter diameter and indenter displacement was studied. The results show that the indenter diameter and indenter displacement affect the value and area distribution of Von-Mises stress and permanent deformation. </div> <div> <a data-readmore="{ block: '#abstractTextBlock585375', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 121 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> <p>Showing 1 to 10 of 10 Paper Titles</p> </div> </div> </div> </div> </div> </div> </div> </div> <div class="social-icon-popup"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-popup-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-popup-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-popup-icon social-icon"></i></a> </div> </div> <div class="sc-footer"> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="footer-menu col-md-12 col-sm-12 col-xs-12"> <ul class="list-inline menu-font"> <li><a href="/ForLibraries">For Libraries</a></li> <li><a href="/ForPublication/Paper">For Publication</a></li> <li><a href="/insights" target="_blank">Insights</a></li> <li><a href="/DocuCenter">Downloads</a></li> <li><a href="/Home/AboutUs">About Us</a></li> <li><a href="/PolicyAndEthics/PublishingPolicies">Policy & Ethics</a></li> <li><a href="/Home/Contacts">Contact Us</a></li> <li><a href="/Home/Imprint">Imprint</a></li> <li><a href="/Home/PrivacyPolicy">Privacy Policy</a></li> <li><a href="/Home/Sitemap">Sitemap</a></li> <li><a href="/Conferences">All Conferences</a></li> <li><a href="/special-issues">All Special Issues</a></li> <li><a href="/news/all">All News</a></li> <li><a href="/open-access-partners">Open Access Partners</a></li> </ul> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-footer-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-footer-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-footer-icon social-icon"></i></a> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12 footer-copyright"> <p> © 2025 Trans Tech Publications Ltd. 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Defect and Diffusion Forum Vol. 415 | Scientific.Net