気液二層薄膜の挙動を記述する長波方程式(界面現象(3),一般講演)
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概要
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We study thin liquid-vapor layers bounded by rigid parallel walls from both below and above. A set of equations describing the temporal evolution of the interface of the liquid-vapor layers is derived. In this system, the interfacial instability is induced by lateral vapor pressure fluctuation, which is in turn attributed to the effect of phase change: evaporation occurs at the hotter portion of the interface and condensation at the colder one. The high vapor pressure drives the liquid away and the low one pulls it up. The result of linear stability analysis shows that the presence of the pressure dependence of the local saturation temperature suppresses the growth of long-wave disturbances. The instability is enhanced for the thinner vapor layer.
- 2008-09-04