Study MHD mixed convective flow of a vertical porous surface in the presence viscous dissipation

We investigate the steady boundary layer mixed convective flow over a horizontal impermeable wall embedded in a porous medium filled with a water-based nanofluid. The model used for the nanofluid incorporates the effects of the volume fraction parameter. The main objective of the present study is to investigate viscous dissipation and Soret effects on heat and mass transfer in a nanofluid containing Al2O3 and TiO2 nanoparticles. The temperature and concentrations at the wall were kept constant. A similarity transformation was used to obtain a system of nonlinear ordinary differential equations. The resulting nonlinear governing equations with associated boundary conditions were solved numerically using the Matlab bvp4c solver. The effects of viscous dissipation and the Soret parameter on dimensionless temperature, concentration, heat and mass transfer are presented graphically. It was observed that the heat transfer rate decreased with an increase in nanoparticle volume fraction. Comparison of current and previously published results (Lai and Kulaki [10], Arfin et al. [12]) showed a good agreement.

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RADIATION ABSORPTION AND VISCOUS-DISSIPATION EFFECTS ON MAGNETOHYDRODYNAMIC FREE-CONVECTIVE FLOW PAST A SEMI-INFINITE, MOVING, VERTICAL, POROUS PLATE

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.2018024790 ◽

2018 ◽

Vol 45 (5) ◽

pp. 439-458 ◽

Cited By ~ 1

Author(s):

K. V. B. Rajakumar ◽

K. S. Balamurugan ◽

Ch. V. Ramana Murthy

Keyword(s):

Viscous Dissipation ◽

Convective Flow ◽

Porous Plate ◽

Radiation Absorption ◽

Free Convective Flow ◽

Vertical Porous Plate ◽

Flow Past

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Entropy Optimization in Nonlinear Mixed Convective Flow of Nanomaterials Through Porous Space

Journal of Non-Equilibrium Thermodynamics ◽

10.1515/jnet-2019-0048 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Tasawar Hayat ◽

Ikram Ullah ◽

Ahmad Alsaedi ◽

Shaher Momani

Keyword(s):

Convective Flow ◽

Second Law Of Thermodynamics ◽

Second Law ◽

Porous Space ◽

Arrhenius Activation Energy ◽

Suction Parameter ◽

Electrically Conducting ◽

Entropy Optimization ◽

Dimensionless Variables ◽

Mixed Convective Flow

Abstract Our intention in this article is to investigate entropy optimization in nonlinear mixed convective unsteady magnetohydrodynamic flow of nanomaterials in porous space. An exponentially stretched sheet creates the liquid flow. Nanomaterial is considered electrically conducting. The concentration and energy expressions comprise viscous dissipation, Joule heating, thermophoresis and Brownian motion aspects. Arrhenius activation energy is considered. Computation of entropy generation based upon the second law of thermodynamics is made. Nonlinear partial expressions are obtained via suitable dimensionless variables. Resultant expressions are tackled by the OHAM technique. Features of numerous variables on entropy, temperature, velocity and concentration are graphically visualized. Skin friction and the temperature gradient at the surface are also elaborated. Comparative analysis is deliberated in tabulated form to validate the previously published outcomes. Velocity is reduced significantly via the suction parameter. The entropy rate increases for higher values of Brinkman, Biot and Hartmann numbers.

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