Mixed convection flow through a rectangular duct with at least one of the sides of the walls of the rectangle being isothermal under\nthe influence of transversely applied magnetic field has been analyzed numerically in this study.Thegoverning differential equations\nof the problem have been transformed into a system of nondimensional differential equations and then solved numerically. The\ndimensionless velocity, microrotation components, and temperature profiles are displayed graphically showing the effects of various\nvalues of the parameters present in the problem. The results showed that the flow field is notably influenced by the considered\nparameters. It is found that increasing the aspect ratio increases flow reversal, commencement of the flow reversal is observed after\nsome critical value, and the applied magnetic field increases the flow reversal in addition to flow retardation. The microrotation\ncomponents flow in opposite direction; also it is found that one component of the microrotation will show no rotational effect\naround the center of the duct.
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