Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 47, Issue 10-11, Pages 2205-2215Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2003.11.025
Keywords
entropy production; dissipation; turbulent flow; asymptotic considerations; CFD; k-epsilon model; wall-functions; second law analysis
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Entropy production in incompressible turbulent shear flows of Newtonian fluids is analysed systematically and incorporated into a CFD code. There are four different mechanisms of entropy production: dissipation in a mean and fluctuating velocity field and heat flux in a mean and fluctuating temperature field. Based on asymptotic considerations wall functions for the four production terms are developed. These wall functions are mandatory when high-Reynolds number turbulent models are used since peak values of entropy production occur in the immediate vicinity of a wall. As an example pipe flow with heat transfer is analysed and compared to results from a direct numerical simulation with special emphasis on the entropy production in the near wall region. (C) 2003 Elsevier Ltd. All rights reserved.
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