Title: Unsteady coupled heat and mass transfer by mixed convection flow of a micropolar fluid near the stagnation point on a vertical surface in the presence of radiation and chemical reaction

Authors: Ali J. Chamkha; S.M.M. EL-Kabeir; A.M. Rashad

Addresses: Manufacturing Engineering Department, The Public Authority for Applied Education and Training, Shuweikh, 70654, Kuwait ' Department of Mathematics, Faculty of Science, Aswan University, Aswan, 81528, Egypt; Department of Mathematics, College of Science and Humanity Studies, Salman bin Abdulaziz University, AL-Kharj, 11942, Saudi Arabia ' Department of Mathematics, Faculty of Science, Aswan University, Aswan, 81528, Egypt

Abstract: The effects of radiation and chemical reaction on coupled heat and mass transfer by unsteady mixed convection boundary-layer flow of a micropolar fluid near the region of the stagnation point on a double-infinite vertical flat plate are studied. The free stream velocity and the surface temperature and concentration are assumed to vary linearly with the distance along the surface. The flow is impulsively set into motion and both of the temperature and concentration at the surface are also suddenly changed from that of the ambient fluid. The governing partial differential equations are transformed into a set of non-similar equations and solved numerically by an efficient implicit, iterative, finite-difference method. Various comparisons with previously published work are performed and the results are found to be in excellent agreement. A representative set of numerical results for the velocity, angular velocity, temperature and concentration profiles as well as the skin-friction coefficient, wall couple stress, Nusselt number and the Sherwood number is presented graphically for various parametric conditions and discussed.

Keywords: heat transfer; mass transfer; micropolar fluids; thermal radiation; chemical reactions; unsteady mixed convection; stagnation point; vertical surfaces; free stream velocity; surface temperature; finite difference method; FDM; concentration profile; skin friction coefficient; wall couple stress; Nusselt number; Sherwood number.

DOI: 10.1504/PCFD.2015.069576

Progress in Computational Fluid Dynamics, An International Journal, 2015 Vol.15 No.3, pp.186 - 196

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 26 May 2015 *

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