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The SLA (second law analysis) in convective heat transfer processes
Publikationstyp
Journal Article
Date Issued
2016-05-31
Sprache
English
Author(s)
Institut
TORE-URI
Volume
10
Issue
5
Start Page
283
End Page
286
Publisher DOI
Publisher
David Publ.
In all convective heat transfer situations, losses occur in the flow field (by dissipation) as well as in the temperature field (by conduction). Typically these losses are more or less quantified by the friction factor f with respect to losses in the flow field, and the Nusselt number Nu for the heat transfer quality. Assessing the process of convective heat transfer as a whole, then becomes problematic because two different non-dimensional quantities, f and Nu, have to be combined somehow. From a thermodynamics point of view, there is a reasonable alternative: Since all losses become manifest in corresponding entropy generation rates, these rates are determined in the velocity as well as in the temperature field. Based on the integration of the entropy generation fields, an energy devaluation number is introduced. It basically determines how much of the so-called entropic potential of the energy involved in a convective heat transfer process is used within it. This approach is called SLA (second law analysis).
Subjects
Second Law Analysis
Energy Devaluation Number
Entropic Potential
DDC Class
530: Physik
600: Technik
620: Ingenieurwissenschaften