Modelling of frost growth and densification

A one-dimensional transient formulation is derived to predict frost growth and densification on a cold wall submitted to a moist air flow. The model is based on a local volume averaging technique that allows the computation of temperature and density distributions throughout the entire frost layer a...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1997-09, Vol.40 (13), p.3177-3187
Main Authors: Le Gall, R., Grillot, J.M., Jallut, C.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical engineering
Chemical Sciences
Energy
Energy. Thermal use of fuels
Engineering Sciences
Exact sciences and technology
Heat transfer
Theoretical studies. Data and constants. Metering
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Summary:A one-dimensional transient formulation is derived to predict frost growth and densification on a cold wall submitted to a moist air flow. The model is based on a local volume averaging technique that allows the computation of temperature and density distributions throughout the entire frost layer according to time. It is particularly shown that the effective vapour mass diffusivity throughout frost should reach values several times larger than the molecular diffusivity, so that the model is in agreement with experimental data. In order to represent this phenomenon, a new expression for the so-called diffusion resistance factor is proposed. Values of an adjustable parameter appearing in this expression are correlated to heat and mass transfer boundary conditions, and to the global rate of densification. Two possible interpretations of the phenomenon are proposed.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(96)00359-6