球状気液界面における蒸発係数(相変化,一般講演)

概要

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Kinetics of phase change at spherical interface between an argon nanodroplet and its vapor is studied by molecular dynamics simulation. The evaporation coefficient is evaluated at spherical control surface around the nanodroplet at 85K, however it depends on not only a radius of the nanodroplet but also that of control surface. Thus we define a new specific control surface, where the mass flux of evaporating molecules from the nanodroplet into vacuum is equal to that from the planar liquid film. The specific surface is found to be in a few nanometers distance from the center of the vapor-liquid transition layer. We adopt this surface as a interface for evaluating evaporation coefficient and successfully determine the evaporation coefficients for argon nanodroplets ranging from 1 to 4nm in radius. As a result, the evaporation coefficient decreases with decreasing in the radius of the nanodroplet.
日本流体力学会の論文
2010-09-09