直線並びに螺旋上昇気泡運動に及ぼす混入微細粒子の影響

抄録

LDV, PIV and some methods using ultrasonic sound have been often employed to measure multiphase flows. Fine particles are usually added into flows as tracer or scattering particles. The effect of particles added in on the flow characteristics is, however, not examined in detail. In this study, the authors measured the movement of linearly and helically rising bubbles to investigate the effect of fine particles mixed into liquid phase. Polyethylene particles of 160μm medium diameter were used. The bubble size, terminal rising velocity, migration velocity of bubbles, diameter and wave length of helix, and helical period were measured. The reductions of bubble diameter, velocities of bubbles, and helical sizes were recognized by adding particles for some cases.