Abstract
In order to clarify the hydrodynamic performance of the gas-liquid mixture above a gas distributor, the gas void fraction and the froth height for the foam layer with a low clear liquid height on a perforated plate under liquid stagnant flow were studied theoretically. In the present work, it was assumed that the shape of a bubble in the foam layer was a spherical capped bubble. Further, it was considered that the bubble rising through the liquid was accompanied by some volume of liquid as the wake behind it. As a result, it was found that the gas void fraction and the froth height are given by a function of the Froude number based on the clear liquid height and the liquid hold-up. Furthermore, these equations were compared with the results obtained by Azbel and Kim.
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