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

Publikationstyp
Journal Article
Publikationsdatum
2016-05-20
Sprache
English
Author
Herwig, Heinz 
Institut
Technische Thermodynamik M-21 
DOI
10.15480/882.1417
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1420
Lizenz
https://creativecommons.org/licenses/by/4.0/
Enthalten in
Entropy 
Citation
Entropy 18 (2016), 5: 198
Publisher DOI
10.3390/e18050198
Scopus ID
2-s2.0-85028464500
Publisher
Multidisciplinary Digital Publishing Institute
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.
Schlagworte
dimensional analysis
energy devaluation
entropic potential
DDC Class
530: Physik