Diffuser and nozzle design optimization by entropy generation minimization

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Bibliographic Details
Published in:	Entropy pages:1380-1402; 13(2011), Seite 1380-1402; volume:13; year:2011
Authors and Corporations:	Schmandt, Bastian (Author), Herwig, Heinz (Author), Technische Universität Hamburg-Harburg Institut für Thermofluiddynamik (Other), Technische Universität Hamburg-Harburg (Other, Sonstige Körperschaft)
Other Authors:	Herwig, Heinz [Author]
Type of Resource:	E-Book Component Part
Language:	English
published:	2011
Series:	Entropy, 13(2011), Seite 1380-1402
Subjects:	second law analysis entropy generation optimization diffuser
Source:	Verbunddaten SWB Lizenzfreie Online-Ressourcen
ISSN:	1099-4300

Description
Summary:	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.
Physical Description:	Illustrationen, Diagramme
ISSN:	1099-4300
DOI:	10.3390%2Fe13071380