霜層厚さに及ぼす冷却面姿勢の影響

抄録

Frosting is the formation of a porous layer consisting of ice and air on a cooled surface, and it is an unsteady phenomenon involving both simultaneous heat and mass transfer. This phenomenon is complex and has not yet been systematically understood. In this work, the objective is to investigate the fundamentals of the frosting phenomenon. In order to do so, we focused on the frost layer thickness, which is one of the quantifying variables of the frosting phenomenon and investigated the effect of cooling surface’s orientation on the frost layer thickness at different wettabilities of the cooling surface, the reason being the wettability is considered as effective for frost reduction. Results show that frost layer thickness is drastically affected by the cooling surface’s orientation. Our research found that the followings are the factors that affect the frost layer thickness: effect of gravity on the rate of linear crystal growth, the mutual relationship between heat and mass transfer, and detachment of crystals.