Title: Entropy generation due to heat and fluid flow in backward facing step flow with various expansion ratios

Authors: Eiyad Abu-Nada

Addresses: Department of Mechanical Engineering, Hashemite University, Zarqa, 13115, Jordan

Abstract: The present research investigated second law analysis of laminar flow over a backward facing step with various expansion ratios (ER). As Reynolds number (Re) increased the value of total entropy generation (Ns) increased. For smaller values of Re as the expansion ratio increased the value of Ns decreased. However, for higher values of Re as ER increased the value of Ns decreased but at smaller rates. The total Bejan number increased as the ER increased. At the bottom wall the minimum value of Ns occurred at the step location and the maximum value of Ns occurred inside the recirculation zone.

Keywords: entropy generation; second-law analysis; separated flow; heat transfer; fluid flow; exergy.

DOI: 10.1504/IJEX.2006.010234

International Journal of Exergy, 2006 Vol.3 No.4, pp.419 - 435

Available online: 11 Jul 2006 *

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