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Modeling of frosting behavior on a cold plate
Authors:Dong-Keun Yang  Kwan-Soo Lee  
Affiliation:aDepartment of Mechanical Engineering, Graduate School, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, South Korea;bSchool of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, South Korea
Abstract:
This paper proposes a mathematical model to predict the frost properties and heat and mass transfer within the frost layer formed on a cold plate. Laminar flow equations for moist air and empirical correlations for local frost properties are employed to predict the frost layer growth. Correlations for local frost density and effective thermal conductivity of the frost layer, derived from various experimental data, are expressed as a function of the various frosting parameters: the Reynolds number, frost surface temperature, absolute humidity and temperature of the moist air, cooling plate temperature, and frost density. The numerical results are compared with experimental data to validate the proposed model, and those agree well with the experimental data within a maximum error of 10%. Heat and mass transfer coefficients obtained from the numerical analyses are also presented. The results show that the model for the frost growth using the correlation of the heat transfer coefficient without considering the air flow has a limitation in its application.
Keywords:Modelling   Frost formation   Heat transfer   Mass transfer   Flat plate   Correlation   Density   Thermal conductivityMots clé  s: Modé  lisation   Givrage   Transfert de chaleur   Transfert de masse   Plaque plane   Corré  lation   Densité     Conductivité   thermique
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