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Entropy 2011, 13(9), 1555-1583; doi:10.3390/e13091555

Spectral Entropy in a Boundary-Layer Flow

Professor Emeritus of Mechanical Engineering, University of Utah, 2067 Browning Avenue, Salt Lake City, UT 84108, USA
Received: 15 July 2011 / Revised: 20 August 2011 / Accepted: 23 August 2011 / Published: 26 August 2011
(This article belongs to the Special Issue Entropy Generation Minimization)
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This article presents a comparison of the entropy production in a laminar and transitional boundary layer flow with the spectral entropy produced in a region of instability induced by an imposed periodic disturbance. The objective of the study is exploratory in nature by computing a boundary-layer environment with well-established computer techniques and comparing the predictions of the maximum rate of entropy production in the wall shear layer with the deterministic prediction of the spectral entropy growth within an inceptive instability in the inner region of the upstream boundary-layer flow. The deterministic values of the spectral entropy within the instability are brought into agreement with the computed rate of entropy production inversely along the shear flow with the assumption that the instability is of a span-wise vortex form and that the spectral entropy components are transported into the wall shear layer by vortex down sweep and are processed into thermodynamic entropy in the boundary-layer wall region.
Keywords: boundary-layer computations; boundary layer entropy production; induced flow instabilities; spectral entropy; vortex-induced down sweep boundary-layer computations; boundary layer entropy production; induced flow instabilities; spectral entropy; vortex-induced down sweep
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Isaacson, L.K. Spectral Entropy in a Boundary-Layer Flow. Entropy 2011, 13, 1555-1583.

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