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International Heat Transfer Conference 8

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

FLOW FIELD AND HEAT TRANSFER ASSOCIATED WITH LAMINAR FLOW OVER A FORWARD-FACING STEP

Amichal Baron
Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA

Fu-Kang Tsou
Department of Mechanical Engineering, Drexel University, Philadelphia, PA 19104

Win Aung
International Network for Engineering Education and Research, Potomac, MD, USA, National Science Foundation, Arlington, VA, USA

DOI: 10.1615/IHTC8.540
pages 1077-1082

Abstract

Numerical studies are performed for flow and heat transfer associated with a plane laminar flow past a forward-facing step. Such a flow may have one or two separated regions dependent upon the approaching boundary-layer thickness and Reynolds number. Furthermore, the pressure gradient across the step is extremely large and the Nusselt number increases to a highest value at the upper corner of the step.
A power law numerical scheme combined with a false vorticity-stream function approach is employed for computation. Because of the large pressure gradient at the step, there was difficulty in obtaining convergence of the variables in question. A new method based on an accurate description of non-slip wall condition has been developed and utilized to improve the traditional wall vorticity boundary condition. The convergence is then obtained in about 350 iterations for a 56 × 49 grid system.
The computed reattachment distances in the upper separated region agree with the available experimental data for the case of a blunt plate. The heat transfer augmentation is significant across the step; it is however counterbalanced by the deterioration of heat transfer immediately upstream of the step.

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