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Entropy 2011, 13(7), 1380-1402;

Diffuser and Nozzle Design Optimization by Entropy Generation Minimization

Institute of Thermo-Fluid Dynamics, Hamburg University of Technology, Denickestr. 17, 21073 Hamburg, Germany
Author to whom correspondence should be addressed.
Received: 10 June 2011 / Revised: 1 July 2011 / Accepted: 15 July 2011 / Published: 20 July 2011
(This article belongs to the Special Issue Entropy Generation Minimization)


Diffusers and nozzles within a flow system are optimized with respect to their wall shapes for a given change in cross sections. The optimization target is a low value of the head loss coefficient K, which can be linked to the overall entropy generation due to the conduit component. First, a polynomial shape of the wall with two degrees of freedom is assumed. As a second approach six equally spaced diameters in a diffuser are determined by a genetic algorithm such that the entropy generation and thus the head loss is minimized. It turns out that a visualization of cross section averaged entropy generation rates along the flow path should be used to identify sources of high entropy generation before and during the optimization. Thus it will be possible to decide whether a given parametric representation of a component’s shape only leads to a redistribution of losses or (in the most-favored case) to minimal values for K. View Full-Text
Keywords: second law analysis; entropy generation; optimization; diffuser second law analysis; entropy generation; optimization; diffuser

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Schmandt, B.; Herwig, H. Diffuser and Nozzle Design Optimization by Entropy Generation Minimization. Entropy 2011, 13, 1380-1402.

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