Abstract
The behavior of a slightly rarefied vapor gas flowing around its spherical condensed phase is investigated on the basis of the linearized BKW (or BGK) equation and the diffuse reflection boundary condition. It is shown that the pressure field induced by velocity field plays an important role. The condensation occurs over the front part of the condensed phase and the evaporation over the rear due to this pressure field. This interphase transfer process reduces the total drag acting on the spherical condensed phase.
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