Title: Entropy analysis of laminar-forced convection in a pipe with wall roughness

Authors: A. Alper Ozalp

Addresses: Department of Mechanical Engineering, University of Uludag, 16059 Gorukle, Bursa, Turkey

Abstract: Momentum and heat transfer rates, as well as entropy generation have been numerically investigated for fully developed, forced convection, laminar flow in a micro-pipe. Compressible and variable fluid property continuity, Navier-Stokes and energy equations are solved for various Reynolds number, constant heat flux and surface roughness cases; entropy generation is discussed in conjunction with the velocity and temperature profiles, boundary layer parameters and heat transfer-frictional characteristics of the pipe flow. Simulations concentrated on the impact of wall roughness based viscous dissipation on the heat transfer behaviour and so occurring heating/cooling activity and the resulting overall and radial entropy generation.

Keywords: entropy analysis; laminar flow; forced convection; pipes; wall roughness; micropipes; entropy generation; Bejan number; momentum transfer; heat transfer; Reynolds number; constant heat flux; surface roughness.

DOI: 10.1504/IJEX.2009.024001

International Journal of Exergy, 2009 Vol.6 No.2, pp.249 - 275

Available online: 22 Mar 2009 *

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