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Publisher DOI: 10.3390/e16062959
Title: How to determine losses in a flow field: A paradigm shift towards the second law analysis
Language: English
Authors: Herwig, Heinz 
Schmandt, Bastian 
Keywords: second law analysis; entropy generation; entropic potential
Issue Date: 26-May-2014
Publisher: Multidisciplinary Digital Publishing Institute
Source: Entropy 16 (6): 2959-2989 (2014)
Abstract (english): 
Assuming that CFD solutions will be more and more used to characterize losses in terms of drag for external flows and head loss for internal flows, we suggest to replace single-valued data, like the drag force or a pressure drop, by field information about the losses. These information are gained when the entropy generation in the flow field is analyzed, an approach that often is called second law analysis (SLA), referring to the second law of thermodynamics. We show that this SLA approach is straight-forward, systematic and helpful when it comes to the physical interpretation of the losses in a flow field. Various examples are given, including external and internal flows, two phase flow, compressible flow and unsteady flow. Finally, we show that an energy transfer within a certain process can be put into a broader perspective by introducing the entropic potential of an energy.
DOI: 10.15480/882.1411
ISSN: 1099-4300
Journal: Entropy
Other Identifiers: doi: 10.3390/e16062959
Institute: Technische Thermodynamik M-21 
Thermofluiddynamik (M-21H) 
Document Type: Article
License: CC BY 3.0 (Attribution) CC BY 3.0 (Attribution)
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