The effects of radiation optical properties on the unsteady 2D boundary layer MHD flow and heat transfer over a stretching plate
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论文类型：期刊论文
发表时间：2017-02-01
发表刊物：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
收录刊物：SCIE、EI
卷号：105
页面范围：109-123
ISSN号：0017-9310
关键字：Boundary layer; Chebyshev collocation spectral method (CCSM); Magnetohydrodynamics (MHD); Optical properties; Viscous dissipation; Joule heating
摘要：In this work, the effects of radiation optical properties and Lorentz force on the 2D unsteady laminar boundary magnetohydrodynamic (MHD) fluid flow and heat transfer along a semi-infinite stretching plate are numerically investigated, the Joule heating effect and viscous dissipation are considered. The heat flux caused by the thermal radiation is obtained by solving the radiation transfer equation (RTE) instead of the Rosseland approximation. All the governing equations, including continuous equation, momentum equation, energy equation, and RTE subject to the boundary radiative emission, are transformed into dimensionless forms. The dimensionless governing equations together with the corresponding boundary conditions are solved numerically via Chebyshev collocation spectral method (CCSM). The effects of various physical parameters, say, Ha, Pr, Ec and Pl, especially the optical properties such as the optical thickness, the scattering albedo, and the wall emissivity of the plate, on the flow and heat transfer are depicted graphically and analyzed in detail. It is found that, due to the thermal radiation, the overall average temperature within the boundary layer becomes much higher and the boundary layer becomes thicker. The magnetic force can suppress the fluid flow significantly and stop the convective heat transfer effectively. Viscous dissipation and Joule heating greatly enhance the temperature distribution with the help of the magnetic field. (C) 2016 Elsevier Ltd. All rights reserved.
发表时间：2017-02-01