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What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives?

Institute for Thermo-Fluid Dynamics, Hamburg University of Technology, 21073 Hamburg, Germany
Academic Editor: Milivoje M. Kostic
Entropy 2016, 18(5), 198; https://doi.org/10.3390/e18050198
Received: 21 March 2016 / Revised: 11 May 2016 / Accepted: 12 May 2016 / Published: 20 May 2016
(This article belongs to the Section Thermodynamics)
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. View Full-Text
Keywords: dimensional analysis; energy devaluation; entropic potential dimensional analysis; energy devaluation; entropic potential
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Herwig, H. What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? Entropy 2016, 18, 198.

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