Abstract
The present study is concerned with the spatial variation of the frost thickness as well as the pattern of the frost crystals formed on a cold plate in atmospheric air. Experimental results regarding the two-dimensional variation of the frost thickness at the leading edge and observation on the growth of the frost crystals on the frost formation are provided. A microscopic image system is used to observe the structure of the frost layer. The environmental variables considered in this study include the velocity, temperature, and relative humidity of the air ( V, T a, and φ), as well as the surface temperature of the cold plate ( T w), which is varied by adjusting the cooling refrigerant temperature ( T ref). The ranges of the physical variables considered in this study are 2⩽ V⩽8 m/s, 18⩽ T a⩽30 °C, 40%⩽ φ⩽70%, − 18⩽T ref ( and T w )⩽0 °C.
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