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Entropy 2015, 17(12), 8187-8206; doi:10.3390/e17127874

Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration

Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg “Otto von Guericke”, Universitätsplatz 2, 39106 Magdeburg, Germany
Starter Motors and Generators, Robert Bosch GmbH, Robert-Bosch Strasse 2, 71701 Schwieberdingen, Germany
Author to whom correspondence should be addressed.
Academic Editors: Morin Celine, Bernard Desmet and Fethi Aloui
Received: 23 October 2015 / Revised: 26 November 2015 / Accepted: 27 November 2015 / Published: 15 December 2015
(This article belongs to the Special Issue Entropy Generation in Thermal Systems and Processes 2015)
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The present paper analyzes numerically the entropy generation induced by forced convection in a canonical configuration. The configuration itself includes two well known fluid dynamic problems: (1) an external flow (flow around a cylinder, Kármán flow); and (2) an internal flow (flow between two concentric rotating cylinders, Couette flow). In many daily engineering issues (e.g., cooling of electric machines), a combination of these problems occurs and has to be investigated. Using the canonical configuration, the fields of entropy generation are analyzed in this work for a constant wall heat flux but varying two key parameters (Reynolds numbers Re and Re0). The entropy generation due to conduction shows an absolute minimum around Re0 = 10,000. The same minima can be found by a detailed analysis of the temperature profile. Thus, entropy generation seems to be a suitable indicator for optimizing heat exchange processes and delivers a large amount of information concerning fluid and heat transport. View Full-Text
Keywords: entropy generation; second-law analysis; transport phenomena; exergy; cooling entropy generation; second-law analysis; transport phenomena; exergy; cooling

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Eger, T.; Bol, T.; Thévenin, D.; Schroth, R.; Janiga, G. Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration. Entropy 2015, 17, 8187-8206.

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