10.15480/882.1417
Herwig, Heinz
Heinz
Herwig
11010224X
What exactly is the Nusselt Number in convective heat transfer problems and are there alternatives?
Multidisciplinary Digital Publishing Institute
2016
Journal Article
dimensional analysis
energy devaluation
entropic potential
Physik
TUHH Universitätsbibliothek
TUHH Universitätsbibliothek
2017-08-28
2017-08-28
2016-05-20
2017-08-24
en
Entropy 18 (2016), 5: 198
http://tubdok.tub.tuhh.de/handle/11420/1420
urn:nbn:de:gbv:830-882w02226
11420/1420
10.3390/e18050198
1099-4300
Entropy
2016
Multidisciplinary Digital Publishing Institute
Creative Commons Attribution 4.0 International
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.
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.