Frosting is a phenomenon that takes place on a surface that has been cooled to a temperature below solidification temperature of water vapor in air. Frosting occurs by either sublimation or by solidification of condensate on the surface, and frost layer is a porous layer of ice and air. Advances in air-conditioning and refrigeration technology have brought about frosting issues in several fields as well as a broadening of the temperature range in which frosting occurs. In the present work, we investigated mass transfer characteristics in frosting phenomenon under natural convection condition in order to establish mass transfer in the process of frosting; the parameter of study was the cooling surface temperature, which was changed between −10 to −114°C. The effects of the cooling surface temperature and absolute humidity on the mass transfer characteristics in the frosting process were clarified.

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