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Unsteady Volumetric Entropy Generation Rate in Laminar Boundary Layers

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Author(s): E. J. Walsh | D. Hernon

Journal: Entropy: International and Interdisciplinary Journal of Entropy and Information Studies
ISSN 1099-4300

Volume: 8;
Issue: 1;
Start page: 25;
Date: 2006;
Original page

Keywords: laminar flow | unsteady entropy generation | dissipation coefficient.

ABSTRACT
The prediction of the entropy generation rate in laminar shear layers is treated as steady, even in the presence of high levels of free stream turbulence. Here we highlight the deficiencies of this approach by quantifying the magnitude of entropy generation rate fluctuations in the laminar boundary layer subjected to free stream turbulence. We find fluctuation levels in excess of 100% in the near wall region, thereby indicating the need to account for the unsteadiness in laminar boundary layers subjected to free stream turbulence.
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