Heat and mass transfer by natural convection in a doubly stratified non-Darcy micropolar fluid

Natural convection heat and mass transfer along a vertical plate embedded in a doubly stratified micropolar fluid saturated non-Darcy porous medium is presented. The governing nonlinear equations are solved numerically using the Keller-box method. The effects of physical parameters on velocity, microrotation, temperature, concentration, local skin friction and wall couple stress coefficient, heat and mass transfer coefficients are illustrated graphically and in tabular form. The results of convection in a micropolar fluid along a vertical plate are obtained as a special case from the present analysis and are found to be in good agreement with the previously published results. (C) 2010 Elsevier Ltd. All rights reserved.