波状流域での臭化リチウム水溶液膜への水蒸気の吸収

概要

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A model of laminar flow with a smooth surface was proposed for the prediction of the absorption rate of water vapor into an absorbent film flowing down a vertical plate simulating a cooling pipe in the absorber of an absorption chiller. However, the falling fi1m begins to show a wavy surface as the film Reynolds number exceeds 20. In this paper, the process is numerically analyzed by assuming sinusoidal wave motion over the falling film. The velocity profile inside the film is determined following Kapitza's analysis. The wave phase velocity and the wavelength are determined from Pierson's equations which are derived from the stability analysis. The wave amplitude is assumed to be 30% of average film thickness. The results are compared with those of a laminar flow with a smooth surface. It is found that the absorption rates increased by a factor of more than 1.7-2.4 over the film Reynolds number range of 20-100.
一般社団法人日本機械学会の論文
1990-06-25