Title: Numerical investigation of entropy generation in an unsteady flow through a porous pipe with suction

Authors: Oluwole Daniel Makinde; Tirivanhu Chinyoka; Adetayo S. Eegunjobi

Addresses: Institute for Advance Research in Mathematical Modeling and Computations, Cape Peninsula University of Technology, P.O. Box 1906, Bellville 7535, South Africa ' Center for Research in Computational and Applied Mechanics, University of Cape Town, Rondebosch 7701, South Africa ' Institute for Advance Research in Mathematical Modeling and Computations, Cape Peninsula University of Technology, P.O. Box 1906, Bellville 7535, South Africa

Abstract: This paper investigates the entropy generation rates in an unsteady flow of a variable viscosity incompressible fluid through a porous pipe with uniform suction at the surface. The nonlinear governing equations for momentum and energy balance are derived and solved numerically using a semi-implicit finite difference scheme in order to obtain the fluid velocity and temperature profiles. Numerical results for volumetric entropy generation numbers, irreversibility distribution ratio and the Bejan number are presented graphically and discussed quantitatively for various values of the embedded parameters.

Keywords: porous pipe flow; heat transfer; irreversibility analysis; entropy generation; unsteady flow; porous pipes; suction; variable viscosity; incompressible fluids; finite difference; fluid velocity; temperature profile.

DOI: 10.1504/IJEX.2013.054114

International Journal of Exergy, 2013 Vol.12 No.3, pp.279 - 297

Received: 28 Mar 2012
Accepted: 07 Jun 2012
Published online: 23 May 2013 *

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