演講公告 90年3月26日 (星期一)

摘要

The behavior of steady flows of a vapor with evaporation and condensation on the boundary is investigated on the basis of kinetic theory. The special attention is focused on the behavior in the continuum limit, the limit where the mean free path of the vapor molecules goes to zero, when an infinitesimal amount of a noncondensable gas (another gas that neither evaporates nor condenses on the boundary) is contained in the domain. First, the simple one-dimensional case (the two-surface problem of evaporation and condensation) is investigated with the aid of asymptotic and numerical analyses of the Boltzmann equation. It is shown that, in the continuum limit, the infinitesimal amount of the noncondensable gas accumulates inside the infinitely thin Knudsen layer on the condensing surface and gives a finite effect on the vapor flows. Then, the case of general geometry is discussed briefly.