The Effect of Surface Wettability on the Defrost Process by Yang Liu & Francis A. Kulacki

Author:Yang Liu & Francis A. Kulacki
Language: eng
Format: epub
ISBN: 9783030026165
Publisher: Springer International Publishing

The Force Balance During Meltwater Accumulation

During meltwater accumulation, when the frost layer is either saturated with meltwater or under the condition that the melting rate is greater than the permeation rate, meltwater can accumulate at the solid surface. A thin water film then stands between the solid surface and the frost layer (Fig. 3.10). The maximum thickness of the water film is determined by a force balance. The water film is subject to gravity and shear forces at the solid–water and water–frost interfaces. The frost column is subject to the body force and the shear force at the water–frost interface. The bulk mass is attached to the solid surface by surface tension. The shear force at the solid surface is associated with the surface wettability and surface temperature. The force balance for water film is

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