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Proceedings of CHT-17 ICHMT International Symposium on Advances in Computational Heat Transfer
May 28 - June 1, 2017, Napoli, Italy

DOI: 10.1615/ICHMT.2017.CHT-7


ISBN Print: 9781-56700-4618

ISSN: 2578-5486

POROUS MEDIA MODELIZATION OF MICRO SCALE, GAS-GAS HEAT EXCHANGER

pages 1267-1276
DOI: 10.1615/ICHMT.2017.CHT-7.1350
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RÉSUMÉ

Microscale heat exchangers usually include a large number of microtubes. Complete CFD description of the flow requires, thus, a large number of points and an amount of computational resources that make it unpractical for routine analysis, optimization or analysis of complex system where the heat exchanger is only one of the main components. Here, an efficient equivalent porous media model is adopted in order to reduce by orders of magnitude such computational effort. Similar models are often used in macroscale environment: however, the present implementation addresses some specific issue related to micro scaling effects. In particular, three, coupled, solutions are carried out throughout the whole domain, for the hot fluid temperature, cold fluid temperature, and solid temperature. Coupling is given by source terms redistributing in the computational volume the heat transfer between wall and fluids. This allows to take into account the conjugate heat transfer effects. Furthermore, specific microscale correlations are used for the determination of heat transfer coefficients and friction factors, using local values and properly taking into account compressibility effects. The model is validated against previous full CFD results for the complete conjugate heat transfer problem.

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