二次元せん断流における粒子挙動の検討

概要

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Experiments were performed in a two-phase, two-freestream plane mixing layer to study the behaviour of heavy spheres in an intermittent shear flow. Particles with three different diameters were employed in these experiments. Comparisons are presented between data on streamwise and transverse components of particle and gas velocities. These data, as well as flow visualization images, suggest that the ratio of the particle time-constant τ_p and the large-scale eddy turnover time plays an important role in the cross-stream transport of a heavy dispersed phase. When the τ_p/τ was approximately 0 (1), heavy particles began to move with gas flow. There exists movement of heavy spheres back toward the particle feedstream. The transverse component of large particle turbulent velocity, v', in the interior of the layer was observed to be significantly smaller than the corresponding streamwise component, u'. <v^2>/<u^2> reaches an asymptotic value, 0.2, around the high-speed side of the mixing layer.
1990-08-25