4224 振動格子乱流場での気液間相互干渉による乱流特性変化(G05-12 気泡・液滴(1),G05 流体工学)  [in Japanese] 4224 A Change of Turbulence Characteristic by Bubble-Liquid Mutual Interference in the Oscillating-grid Turbulence  [in Japanese]

This study focuses on a change of turbulence characteristics caused by bubble swarm in the homogeneous isotropic turbulence. The approximately homogeneous isotropic turbulence is generated by oscillating-grid system, and the ten audio speakers are used to precisely control the injection of bubble swarm. The liquid velocity was measured via two LDV probes. Bubble-Liquid interaction and turbulence structure were discussed on the basis of the turbulence intensity and integral scale (calculated by spatial correlation coefficient). As a result, it was confirmed that the vertical turbulence intensity was decreased by the interaction between the bubble swarm and oscillating-grid turbulence, in the range studied. It is conceivable that there are intensive relationships between this phenomenon and integral scale.