1411 微粒子分散系の集団的挙動と個別的挙動(OS14-2 分散系混相流のダイナミクス,オーガナイズドセッション)

概要

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The sedimentation of partially suspended particles in fluid has been studied experimentally. We have examined whether collective or individual motion of particles is dominant during sedimentation, i.e., whether the particles settle as a continuous suspension or they settle individually relative to surrounding fluid. We observed the settling of a stratified suspension which has both the upper and lower interfaces of concentration in quasi-two dimensional vessel. The experimental observation shows that the gravity-induced instability of suspension-fluid interface governs the particle motion and the suspension behaves as a continuous fluid for high concentration and small particle size. However, individual motion of particle relative to fluid stands out in case of large particles with low concentration. The transition from their collective to individual behaviors can be predicted quantitatively by a new parameter which expresses the border resolution of the concentration interface.
一般社団法人日本機械学会の論文
2009-11-06