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  • Open Access

    ARTICLE

    INFLUENCE OF CRITICAL PARAMETERS OF THERMOPHOROSIS ON MHD NON-DARCY FLOW OF A CASSON FLUID PAST A PERMEABLE STRETCHING SHEET

    Kolli Vijayaa,* , G. Venkata Ramana Reddya

    Frontiers in Heat and Mass Transfer, Vol.14, pp. 1-8, 2020, DOI:10.5098/hmt.14.12

    Abstract Present investigation aims at analyzing the properties of heat and transport phenomena of thermal energy and species mass in a non-Darcy Casson fluid flow induced by a erected porous elongated surface considering the effect of non-linear radioactive heat, thermophorosis, first order chemical reaction, Newtonian heating, thermo diffusion, permeability and slip conditions. Influence of critical parameters are widely studied. By inducing the variables of similarity the basic boundary layer equations are transmuted into dimensionless equations and are resolved arithmetically using Runge – Kutta – Fehlberg shooting techniques method. The dominance of critical parameters against velocity, temperature, More >

  • Open Access

    ARTICLE

    EFFECTS OF VARIABLE VISCOSITY ON HEAT AND MASS TRANSFER BY MHD MIXED CONVECTION FLOW ALONG A VERTICAL CYLINDER EMBEDDED IN A NON-DARCY POROUS MEDIUM

    Saddam Atteyia Mohammad*

    Frontiers in Heat and Mass Transfer, Vol.14, pp. 1-10, 2020, DOI:10.5098/hmt.14.7

    Abstract An analysis was performed to study the effects of variable viscosity on steady, laminar, hydromagnetic simultaneous heat and mass transfer by mixed convection flow along a vertical cylinder embedded in a non-Darcy porous medium. The analysis was performed for the case of power-law variations of both the surface temperature and concentration. The viscosity of the fluid is assumed to be an inverse linear function of temperature. Certain transformations were employed to transform the governing differential equations to non-similar form. The transformed equations were solved numerically by finite difference method. The entire regime of mixed convection… More >

  • Open Access

    ARTICLE

    HALL AND ION SLIP EFFECTS ON AG - WATER BASED MHD NANOFLUID FLOW OVER A SEMI-INFINITE VERTICAL PLATE EMBEDDED IN A POROUS MEDIUM

    CH. Baby Rania , N. Vedavathib , K.S. Balamuruganc, G. Dharmaiahd,*

    Frontiers in Heat and Mass Transfer, Vol.14, pp. 1-11, 2020, DOI:10.5098/hmt.14.6

    Abstract The present work provides an analysis of the Dufour, radiation absorption, Hall and ion slip effects on MHD free convective rotating flow of Agwater based nanofluid past a semi-infinite permeable moving plate with constant heat source. In this regard, metal will be considered as nanoparticles with water as base fluid. Governing nonlinear boundary layer equations and boundary conditions are transformed into a system of nonlinear ordinary coupled differential equations and are solved by perturbation technique. Effects of different parameters on skin friction coefficient, local Nusselt number and Local Sherwood number are also discussed. More >

  • Open Access

    ARTICLE

    OPTIMIZATION STUDIES OF TRANSPIRATION COOLING USING POROUS MEDIUM WITH GRADUALLY-CHANGED STRUCTURE

    Yu Chena , Shen Dua, Dong Lia, Yang Gaob, Ya-Ling Hea,*

    Frontiers in Heat and Mass Transfer, Vol.15, pp. 1-13, 2020, DOI:10.5098/hmt.15.19

    Abstract Non-uniform heating and vapor blockage deteriorate the effectiveness of transpiration cooling, and an optimization method by using porous media with a gradually-changed structure is proposed. The numerical tool based on a two-phase mixture model and local thermal non-equilibrium assumption considering variable properties of coolant is applied. Porous media with linearly-changed porosity or particle diameter is analyzed. The transient results presented that the structure of gradually-changed porosity (or particle diameter) with appropriate parameters can delay the heat transfer deterioration. And it is confirmed that the present theoretical model is an effective tool for optimization design of More >

  • Open Access

    ARTICLE

    Thermal Analysis of MHD Non-Newtonian Nanofluids over a Porous Media

    Asad Ejaz1, Imran Abbas1, Yasir Nawaz1, Muhammad Shoaib Arif1, Wasfi Shatanawi2,3,4,*, Javeria Nawaz Abbasi5

    CMES-Computer Modeling in Engineering & Sciences, Vol.125, No.3, pp. 1119-1134, 2020, DOI:10.32604/cmes.2020.012091 - 15 December 2020

    Abstract In the present research, Tiwari and Das model are used for the impact of a magnetic field on non-Newtonian nanofluid flow in the presence of injection and suction. The PDEs are converted into ordinary differential equations (ODEs) using the similarity method. The obtained ordinary differential equations are solved numerically using shooting method along with RK-4. Part of the present study uses nanoparticles (NPs) like TiO2 and Al2O3 and sodium carboxymethyl cellulose (CMC/water) is considered as a base fluid (BF). This study is conducted to find the influence of nanoparticles, Prandtl number, and magnetic field on velocity More >

  • Open Access

    ARTICLE

    Heat Transfer in MHD Flow of Maxwell Fluid via Fractional Cattaneo-Friedrich Model: A Finite Difference Approach

    Muhammad Saqib1, Hanifa Hanif1, 2, T. Abdeljawad3, 4, 5, Ilyas Khan6, *, Sharidan Shafie1, Kottakkaran Sooppy Nisar7

    CMC-Computers, Materials & Continua, Vol.65, No.3, pp. 1959-1973, 2020, DOI:10.32604/cmc.2020.011339 - 16 September 2020

    Abstract The idea of fractional derivatives is applied to several problems of viscoelastic fluid. However, most of these problems (fluid problems), were studied analytically using different integral transform techniques, as most of these problems are linear. The idea of the above fractional derivatives is rarely applied to fluid problems governed by nonlinear partial differential equations. Most importantly, in the nonlinear problems, either the fractional models are developed by artificial replacement of the classical derivatives with fractional derivatives or simple classical problems (without developing the fractional model even using artificial replacement) are solved. These problems were mostly… More >

  • Open Access

    ARTICLE

    Heat and Mass Transfer Characteristics of Alkali Metals in a Combined Wick of High-Temperature Heat Pipe

    Ping Yu1, *, Chuanhui Huang1, Lei Liu1, Huafeng Guo1, Chengqiang Liu1

    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 267-280, 2020, DOI:10.32604/fdmp.2020.06528 - 21 April 2020

    Abstract To study the heat and mass transfer characteristics of alkali metals in a combined porous wick in high-temperature heat pipes, a three-dimensional (3-D) numerical model is constructed by using the finite volume method, Darcy’s theory, and the theory of local thermal equilibrium. The research finds that the pressure drop of fluids flowing through a combined porous wick exhibits an increasing trend with increasing flow velocity at the inlet and with decreasing permeability of the porous media; a combined porous wick of lower porosity and permeability and larger fluid velocity at the inlet is found to More >

  • Open Access

    ARTICLE

    NUMERICAL SOLUTION ON NON-UNIFORM MESH OF DARCY-BRINKMAN-FORCHHEIMER MODEL FOR TRANSIENT CONVECTIVE HEAT TRANSFER OVER FLAT PLATE IN SATURATED POROUS MEDIUM

    Elyazid Flilihi, Mohammed Sriti, Driss Achemlal

    Frontiers in Heat and Mass Transfer, Vol.12, pp. 1-10, 2019, DOI:10.5098/hmt.12.12

    Abstract A numerical investigation is performed to analyze the transient laminar free convection over an isothermal inclined plate embedded in a saturated porous medium with the viscous dissipation effects. The flow in the porous medium is modeled with the Darcy-Brinkman- Forchheimer model, taking into account the convective term. The dimensionless nonlinear partial differential equations are solved numerically using an explicit finite difference method. The effects of different parameters: (1 ≤ Re ≤ 10 ; 10−2 ≤ Da ≤ 10 ; 0 ≤ Gr ≤ 50 ; 0 ≤ F r ≤ 3 ; 0 ≤ Ec ≤ More >

  • Open Access

    ARTICLE

    EFFECTS OF NON-UNIFORM SLOT SUCTION/INJECTION AND CHEMICAL REACTION ON MIXED CONVECTIVE MHD FLOW ALONG A VERTICAL WEDGE EMBEDDED IN A POROUS MEDIUM

    M. Ganapathiraoa,∗ , Ali J. Chamkhab, N. Srinivasa Raoc

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-13, 2019, DOI:10.5098/hmt.13.15

    Abstract In this investigation, our objective is to study the effect of non-uniform slot suction or injection into a steady mixed convective MHD boundary layer flow over a vertical wedge embedded in a porous medium in the presence of chemical reaction. The wall of the wedge is embedded in a uniform porous medium in order to allow possible fluid wall suction or injection. The surface of the wedge is maintained at a variable wall temperature and concentration. The fluid is assumed to be viscous, incompressible and electrically conducting; and the magnetic field is applied transversally in… More >

  • Open Access

    ARTICLE

    Unsteady MHD Free Convective Flow Past a Vertical Porous Plate with Span-Wise Fluctuating Heat and Mass Transfer Effects

    S . Samantha Kumari1,*, G. Sankara Sekhar Raju2

    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.5, pp. 471-489, 2019, DOI:10.32604/fdmp.2019.04222

    Abstract This paper investigates the chemical reaction and thermal radiation effects on unsteady MHD free convective flow past a vertical porous plate in the presence of heat absorption/generation. The novelty of present investigation is that the temperature and concentration of the plate are span wise cosinusoidally unsteady with time. The second order perturbation technique is employed to study the non-linear partial differential equations which govern the fluid flow. The effects of magnetic parameter, radiation, Eckert number, Schmidt number and chemical reaction parameters on velocity, temperature and concentration distributions as well as skin friction coefficients, the rate More >

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