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

Entropy

Toni Eger¹  Thomas Bol³  Dominique Thévenin¹  R࿍iger Schroth³  Gปor Janiga¹  Morin Celine²  Bernard Desmet² 

[1] Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg “Otto von Guericke”, Universitätsplatz 2, 39106 Magdeburg, Germany;;Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg “Otto von Guericke”, Universitätsplatz 2, 39106 Magdeburg, GermanyStarter Motors and Generators, Robert Bosch GmbH, Robert-Bosch Strasse 2, 71701 Schwieberdingen, Germany;

关键词: entropy generation;    second-law analysis;    transport phenomena;    exergy;    cooling;   

DOI  :  10.3390/e17127874

来源: mdpi

【 摘 要 】

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 . 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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.