The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium

• Main Authors: Rosali, Haliza, Ishak, Anuar, Nazar, Roslinda, Merkin, John H., Pop, Ioan
• Format: Article
• Published: Elsevier 2014
• Online Access: http://psasir.upm.edu.my/id/eprint/35682/; http://www.sciencedirect.com/science/article/pii/S001793101400372X
• Institution: Universiti Putra Malaysia

The unsteady mixed convection boundary-layer flow towards a stagnation point on a heated vertical surface embedded in a porous medium is considered. The governing partial differential equations are reduced to a system of nonlinear ordinary differential equations using a similarity transformation. These are then solved numerically using the Keller-box method. These numerical results are complemented by asymptotic solutions for large values of A . The influence of dimensionless parameters λλ (mixed convection), A (time variation), n (wall temperature variation) on the flow field and heat transfer is analyzed and discussed, dual solutions being found for both assisting and opposing buoyant flows.