微粒子混合気体流れの衝撃波後方における速度非平衡境界層 : 層流境界層の構造に関する数値解析

概要

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A shock tube wall boundary layer of a dilute dusty gas is studied by a numerical analysis. Transverse motion of particles are taken into account by introducing the Saffman type lift force, which is induced in shear flows if a considerable slip of velocities exists between the gas and the particle motions. The result indicates that in case of large particles the boundary layer is constituted with a particle concentrated layer at a considerable distance from the wall, a clean gas layer on the wall, and a strayed particle layer between the two. While in case of fine particles, typically smaller than 10 μm diameter, the effect of the boundary layer mass sink is superior to the particle lift force, and the boundary layer takes a particle dispersed profile. In both cases, however, the wall heat transfer indicates monotonous change similarly to a clean gas heat transfer, since the process is almost determined in the clean gas wall layer.
1990-10-25