粘弾性流体中を沈降する剛体球の速度と球体積の関係

抄録

Velocity-volume data of sedimenting rigid spheres in viscoelastic liquids were experimentally obtained. The flow fields around a sphere were also measured by using a particle image velocimetry (PIV). No discontinuity in terminal velocity was observed. However, there was a discontinuity in the rate of change of terminal velocity with volume at a shear-wave-based sphere Mach number of unity. It was found that the formation of Mach cones around a sphere plays a key role in the sedimenting velocity of the rigid spheres.