少量の不凝縮ガスを含む水蒸気の鉛直面上への層流自由対流凝縮

概要

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Similarity solutions for free-convection condensation of an air-steam mixture, where the bulk air mass concentrations W_<1V∞> are 0.1, 0.01 and 0.001 and the bulk temperatures T_<V∞> are 100, 65.56℃ and 26.67℃, are presented. From the solutions, a new correlation equation for the gradient of W_<1V> at the vapor-liquid interface is obtained. It is confirmed that this equation agrees well with the similarity solutions not only for an air-steam mixture with large W_<1V∞> values but also for mixtures of ethanol-water and CFC114-CFC11. The algebraic solution using the equation compares well with existing experimental results, even for a helium-steam mixture when the absolute value of the buoyancy term is taken. It is also discussed that the discrepancy between the theoretical solution and the experimental results by Slegers and Seban may be caused by the choice of the representative value of the bulk mass concentration rather than by the effect of forced convection.
社団法人日本機械学会の論文
1993-05-25