ラグランジアン計測による矩形管内流中の固体粒子群間乱れ歪構造

概要

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Turbulence distortion by solid particles in a fully-developed channel flow was investigated by Lagrangian measurement technique. Digital particle image velocimetry and a high-speed CCD camera mounted on a shuttle moving with particle mean streamwise velocity were used to simultaneously detect particle and fluid information amongst particles. Two classes of particles at particle volumetric fraction up to 3.32×10^<-4> were employed to provide characteristic values of length ratio and distance between particles, i.e., inter-particle spacing. Turbulence augmentation by particles greater than the Kolmogorov micro length scale was induced by the region of the high-strain rate and high vorticity on both sides of particles. The Rapid Distortion Theory applied to dispersed two-phase turbulent flows indicated that the directional non-isotropic structure was observed with an increase in particle volumetric fraction. The enstrophy production was enhanced with decreasing values of inter-particle spacing, yieding an increase in the enstrophy amongst particles.
一般社団法人日本機械学会の論文
2000-02-25