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What exactly is the Nusselt Number in convective heat transfer problems and are there alternatives?

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Published in: Entropy volume:18; 18(2016), 5, Artikel-ID 198, Seite 1-15; elocationid:198; pages:1-15; number:5; year:2016
Authors and Corporations: Herwig, Heinz (Author), Technische Universität Hamburg (Other, Sonstige Körperschaft), Technische Universität Hamburg Institut für Technische Thermodynamik (Other, Sonstige Körperschaft)
Type of Resource: E-Book Component Part
Language: English
published:
2016
Series: Entropy, 18(2016), 5, Artikel-ID 198, Seite 1-15
Subjects:
dimensional analysis
energy devaluation
entropic potential
dimensional analysis
energy devaluation
entropic potential
Source: Verbunddaten SWB
Lizenzfreie Online-Ressourcen
ISSN: 1099-4300
Description
Summary: The often used Nusselt number is critically questioned with respect to its physical meaning. Based on a rigorous dimensional analysis, alternative assessment numbers are found that in a systematic way separately account for the quantitative and qualitative aspect of a heat transfer process. The qualitative aspect is related to the entropy generated in the temperature field of a real, irreversible heat transfer. The irreversibility can be quantified by referring it to the so-called entropic potential of the energy involved in the transfer process.
Physical Description: Illustrationen
ISSN: 1099-4300
DOI: 10.3390/e18050198