Chemical entropy generation and magnetohydrodynamic effects on the unsteady heat and fluid flow through a porous medium\nhave been numerically investigated. The entropy generation due to the use of a magnetic field and porous medium effects on\nheat transfer, fluid friction, and mass transfer have been analyzed numerically. Using a similarity transformation, the governing\nequations of continuity, momentum, and energy and concentration equations, of nonlinear system, were reduced to a set of\nordinary differential equations and solved numerically. The effects of unsteadiness parameter, magnetic field parameter, porosity\nparameter, heat generation/absorption parameter, Lewis number, chemical reaction parameter, and Brinkman number parameter\non the velocity, the temperature, the concentration, and the entropy generation rates profiles were investigated and the results were\npresented graphically.
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