Defect and Diffusion Forum Vol. 408

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The collection contains peer-reviewed articles covering theoretical and practical aspects of modeling and numerical investigation of the diffusive convection and magnetohydrodynamic mixed convective flows, heat transfer phenomena in the various media and engineering objects, solving other engineering problems related to heat and mass transfer phenomena." /> <link rel="canonical" href="https://www.scientific.net/DDF.408" /> <meta property="og:title" content="Defect and Diffusion Forum Vol. 408 | Scientific.Net" /> <meta property="og:type" content="website" /> <meta property="og:url" content="https://www.scientific.net/DDF.408" /> <meta property="og:image" content="/Content/app/scinet5/images/metadata_logo.png" /> <meta property="og:image:type" content="image/png" /> <meta property="og:image:width" content="261" /> <meta property="og:image:height" content="260" /> <meta property="og:image:alt" content="Scientific.Net Logo" /> <title>Defect and Diffusion Forum Vol. 408 | 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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. 408</span></div> <div class="page-name-block underline-begin"> <h1 class="page-name-block-text">Defect and Diffusion Forum Vol. 408</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/www.scientific.net/DDF.408">https://doi.org/10.4028/www.scientific.net/DDF.408</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.408/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.408_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 class="pagination-container"><ul class="pagination"><li class="active"><span>1</span></li><li><a href="/DDF.408/2">2</a></li><li class="PagedList-skipToNext"><a href="/DDF.408/2" rel="next">></a></li></ul></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.408.-3">Preface</a> </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.1">Arrhenius Activation Energy Effect on a Stagnation Point Slippery MHD Casson Nanofluid Flow with Entropy Generation and Melting Heat Transfer</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Tunde Abdulkadir Yusuf, Akaje Wasiu, Sulyman O. Salawu, Jacob Abiodun Gbadeyan </div> </div> <div id="abstractTextBlock566178" class="volume-info volume-info-text volume-info-description"> Abstract: This study features the entropy generation analysis on a steady two-dimensional flow of an incompressible Casson fluid with heat and mass transfer over a heated linearly stretching surface is investigated using a modified Arrhenius activation energy. The appropriate model governing the physical phenomenon is converted into a dimensionless equation with the aid of appropriate transformation and are numerically solved using the spectral collocation method. The present research model is concerned to study the stagnation point slippery flow, heat, and mass transfer analysis of a Casson fluid flow past an elastic surface with the impact of a magnetic field. The study focuses on the influences of Arrhenius activation energy, melting heat transfer, and heat source on heat and mass transfer behavior posed by Casson fluid. The magnitude of skin becomes lesser for larger values of slip parameter while the rate of mass transfer is enhanced via greater values of the destructive chemical reaction. Also, an excellent agreement is shown with previous studies for the limiting case. </div> <div> <a data-readmore="{ block: '#abstractTextBlock566178', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 1 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.19">Numerical Study of Combined Surface Radiation and Natural Convection in Vertical Conical Annular Enclosure</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Mohamed Amine Medebber, Belkacem Ould Said, Noureddine Retiel </div> </div> <div id="abstractTextBlock552456" class="volume-info volume-info-text volume-info-description"> Abstract: The present study investigates the combined free convection and surface radiation in a conical annular cylinder filled with air (Pr=0.71). The steady-state continuity, Navier–Stokes and energy equations were carried out by the finite volume method, and the Discrete Ordinates Method (DOM) was used to solve the radiative heat transfer equation (RTE). The boundary conditions are such that the inner and the outer radius of cone are maintained at hot (T<sub>h</sub>) and cold (T<sub>c</sub>) isothermal temperature. The horizontal upper and lower walls are assumed to be isolated. Concerning the radiation exchange, we consider that the fluid (air) is transparent, so only the solid surfaces contribute to the radiation exchange and assumed to be diffuse-gray. The computations are performed for Rayleigh number (<i>Ra</i>) in the range 10<sup>3</sup>≤Ra≤10<sup>6</sup> , the surface emissivity (<i>ε</i>) 0≤ε≤1 and the cone angle () 63o, 76o, 80o and 84o. The key parameters for this analysis are considered as Rayleigh number (<i>Ra</i>), surface emissivity (<i>ε</i>) and the cone angle (). Results are presented in terms of isotherms, streamlines and the average Nusselt numbers. </div> <div> <a data-readmore="{ block: '#abstractTextBlock552456', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 19 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.33">Unsteady Magnetohydrodynamic Mixed Convective Flow of a Reactive Casson Fluid in a Vertical Channel Filled with a Porous Medium</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Lazarus Rundora </div> </div> <div id="abstractTextBlock558259" class="volume-info volume-info-text volume-info-description"> Abstract: This article analyses the thermal decomposition in an unsteady MHD mixed convection flow of a reactive, electrically conducting Casson fluid within a vertical channel filled with a saturated porous medium and the influence of the temperature dependent properties on the flow. The fluid is assumed to be incompressible with the viscosity coefficient varying exponentially with temperature. The flow is subjected to an externally applied uniform magnetic field. The exothermic chemical kinetics inherent in the flow system give rise to heat dissipation. A technique based on a semi-discretization finite difference scheme and the shooting method is applied to solve the dimensionless governing equations. The effects of the temperature dependent viscosity, the magnetic field and other important parameters on the velocity and temperature profiles, the wall shear stress and the wall heat transfer rate are presented graphically and discussed quantitatively and qualitatively. The fluid flow model revealed flow characteristics that have profound ramifications including the increased heat transfer enhancement attributes of the reactive temperature dependent viscosity Casson fluid flow. </div> <div> <a data-readmore="{ block: '#abstractTextBlock558259', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 33 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.51">MHD and Stability for Convective Flow of Micropolar Nanofluid over a Moving and Vertical Permeable Plate</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Reda Alouaoui, Samira Ferhat, M.N. Bouaziz </div> </div> <div id="abstractTextBlock563110" class="volume-info volume-info-text volume-info-description"> Abstract: This work mainly studies the effect of the magnetic field, the suction /injection, the Brownian and thermphorese diffusions and the stability on heat transfer in a laminar boundary layer flux of micropolar nanofluids flow adjacent to moving vertical permeable plate. The appropriate governing equations developed are reduced by the transformation of similarity which are solved using the finite difference method that implements the 3-stage Lobatto collocation formula. A parametric study of the physical parameters is carried out to show their influence on the different profiles. The results show that the microrotation of the suspended nanoparticles and the presence of the magnetic field become important on the heat transfer with good chemical stability of the micropolar nanofluids. </div> <div> <a data-readmore="{ block: '#abstractTextBlock563110', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 51 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.67">Impact of Thermal Stratification on Unsteady Natural Convection Couette Flow Formation in a Vertical Channel Filled with Anisotropic Porous Material</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Basant Kumar Jha, Muhammad Kabir Musa, Abiodun O. Ajibade </div> </div> <div id="abstractTextBlock544276" class="volume-info volume-info-text volume-info-description"> Abstract: Recently, heat transfer problems where anisotropic porous medium or stably stratified fluid are taken into account have been separately studied. Developing a mathematical model that combines these physical quantities naturally results to complex coupled differential equations. In this paper, a fully developed time dependent natural convection Couette flow of stably stratified fluid between vertical parallel channels filled with anisotropic porous material is investigated. The governing partial differential equations are transformed into ordinary differential equations using Laplace transform techniques and then decoupled using D’Alembert method. Exact solutions in Laplace domain for the velocity and temperature equations are then obtained. A numerical method: Riemann-sum approximation is then used to invert the expressions for the velocity and temperature profiles, as well as the resulting skin friction, rate of heat transfer and volumetric mass flow rate into their corresponding time domain. The research establishes that both the anisotropic and the stratification parameters aid in regulating the fluid temperature and velocity. The research further reveals that the fluid velocity attains its maximum (or minimum) velocity when θ = 90<sup>0 </sup>(or θ = 0<sup>0</sup>) for k<sup>*</sup><1 and when k<sup>*</sup>>1, the fluid velocity is least (or maximum) when θ = 90<sup>0</sup> (or θ = 0<sup>0</sup>). </div> <div> <a data-readmore="{ block: '#abstractTextBlock544276', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 67 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.83">Numerical Study of Heat Transfer in Rectangular Fins for Different Cases of Thermo-Physical Properties</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Imene Bennia, Tawfik Benabdallah, Samah Lounis </div> </div> <div id="abstractTextBlock547508" class="volume-info volume-info-text volume-info-description"> Abstract: The present work is a contribution to the development of a calculation code that determines the temperature field on fins having rectangular geometry for any bi-dimensional or three-dimensional simulation conditions. Different cases of simulations are presented. An implicit finite volume method, unconditionally stable, is extended in this study for the discretization of the governing equations. The representative results, validated by the Ansys code, show that the fin temperature increases with the increase of the temperature values selected as the boundary conditions, with the addition of a heat flow or any additional heat source. The numerical results are very consistent with the theory and the results obtained from commercialized codes. By increasing the diffusivity one converge more quickly towards the stationary solution. Upon reducing the fin size a very drastic shift occurs from the transient regime to a permanent one. In the case of a refinement of the mesh, the use of a very small epsilon ensures the convergence. Therefore, the results obtained in this study serve as basis of comparison with any other study on heat transfer on rectangular fins. </div> <div> <a data-readmore="{ block: '#abstractTextBlock547508', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 83 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.99">Investigating Thermal Stability in a Two-Step Convective Radiating Cylindrical Pipe</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Ramoshweu Solomon Lebelo, Radley Kebarapetse Mahlobo, Samuel Olumide Adesanya </div> </div> <div id="abstractTextBlock561319" class="volume-info volume-info-text volume-info-description"> Abstract: Thermal stability in a stockpile of reactive materials is analyzed in this article. The combustion process is modelled in a long cylindrical pipe that is assumed to lose heat to the surrounding environment by convection and radiation. The study of effects of different kinetic parameters embedded on the governing differential equation, makes it easier to investigate the complicated combustion process. The combustion process results with nonlinear molecular interactions and as a result it is not easy to solve the differential equation exactly, and therefore the numerical approach by using the Finite Difference Method (FDM) is applied. The numerical solutions are depicted graphically for each parameter’s effect on the temperature of the system. In general, the results indicate that kinetic parameters like the reaction rate promote the exothermic chemical reaction process by increasing the temperature profiles, whilst kinetic parameters such as the order of the reaction show the tendency to retard the combustion process by lowering the temperature of the system. </div> <div> <a data-readmore="{ block: '#abstractTextBlock561319', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 99 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.408.109">Capillary Rise and Oil Recovery under Primary Bjerknes Force Experienced by Bubbles</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Didier Samayoa, E. Reyes de Luna, L.A. Ochoa-Ontiveros, Liliana Álvarez-Romero, J.G. Barbosa, Israel Miguel Andrés </div> </div> <div id="abstractTextBlock574898" class="volume-info volume-info-text volume-info-description"> Abstract: A numerical study of forced imbibition into capillary tubes under primary Bjerknes force is presented. A mathematical model is developed to predict the motion of a meniscus while an external force is applied. Remarkable enhancement in liquid flow attributed to the frequency and intensity of a waveform on primary Bjerknes force and to the viscosity of fluid was observed. It was found that imbibition optimal frequency for each equilibrium height depends on the time as ω(x<sub>eq</sub>)∼e<sup>mt</sup>, where the recovery time is a viscosity function t(x<sub>eq</sub>)∼μ<sup>H</sup>. The results are presented in a set of curves, which reveal the features of enhanced oil recovery of the system under consideration. Some physical implications are discussed. </div> <div> <a data-readmore="{ block: '#abstractTextBlock574898', 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.408.119">An Analytical Study to Compare the Heat Transfer Performances of Water-Based TiO<sub>2</sub>, SiO<sub>2</sub>, TiC and SiC Nanofluids</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Md Yeashir Arafat, Shashwata Chakraborty </div> </div> <div id="abstractTextBlock565726" class="volume-info volume-info-text volume-info-description"> Abstract: The thermophysical properties as well as the thermal performance of a nanofluid can be altered upon varying the nanoparticle type and/or nanoparticle volume concentration. Herein, the effects of variable nanoparticle concentration on water-based TiO<sub>2</sub>, SiO<sub>2</sub>, TiC, and SiC nanofluids have been studied analytically. The dispersion effects of 1-4% nanoparticle on the single-phase forced convection heat transfer performance of the nanofluids have been investigated. The effective thermophysical properties of the nanofluids are determined adopting the general correlations. The flow velocities of the nanofluids relative to their base fluids are assumed to be constant. Mouromtseff number has been employed as a convenient figure of merit to compare the nanofluids under fully developed internal laminar and turbulent flow conditions. The results indicate an increase in effective density, thermal conductivity, and dynamic viscosity of the nanofluids. Nanofluids containing carbide suspensions exhibit superior heat transfer properties compared to those having oxide suspensions. </div> <div> <a data-readmore="{ block: '#abstractTextBlock565726', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 119 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> <p>Showing 1 to 10 of 12 Paper Titles</p> </div> <div class="pagination-container"><ul class="pagination"><li class="active"><span>1</span></li><li><a href="/DDF.408/2">2</a></li><li class="PagedList-skipToNext"><a href="/DDF.408/2" rel="next">></a></li></ul></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="/read-and-publish-agreements">Read & Publish Agreements</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> © 2024 Trans Tech Publications Ltd. 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Defect and Diffusion Forum Vol. 408 | Scientific.Net