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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

FROST FORMATION ON COOLED PARALLEL PLATES IN LAMINAR FORCED CONVECTION

Get access (open in a dialog) DOI: 10.1615/IHTC11.1010
pages 157-162

Resumo

In this study, frost deposition on cooled parallel plates in laminar forced convection was investigated both, theoretically and by experiment. The independent parameters varied were air velocity or Reynolds number, air temperature, air humidity ratio, and plate temperature. In the experiments time variation of the frost layer thickness was measured at several locations downstream along the test section which was positioned in an open-loop wind tunnel. The process was simulated numerically using a two-dimensional transient model based on the conservation equations of mass, momentum, energy, and species. The physical domain of interest was divided into two subdomains, one for the moist air stream between the plates (gaseous phase), and one for the frost layer (solid phase). The two sets of governing equations were coupled by boundary conditions at the moving interface which required an iterative solution strategy.
With this approach, the local distribution of temperature and porosity in the frost layer, which is nearly impossible to obtain in the experiments, could be predicted at any time. The results of the total heat and mass transfer rates as well as the frost growth rates were compared with the experimental findings.