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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
The SLA (Second Law Analysis) in Convective Heat Transfer Processes
Author(s)
Heinz Herwig
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DOI:10.17265/1934-8975/2016.05.002
Affiliation(s)
Institute of Thermo-Fluid Dynamics, Hamburg University of Technology, Hamburg D-21073, Germany
ABSTRACT
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).
KEYWORDS
Second law analysis, energy devaluation number, entropic potential.
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