Abstract
This paper describes velocity measurements of the micro-scale three-phase flow containing micro-bubbles and micro-particles in a vertical channel. A Particle Tracking Velocimetry (PTV) technique is used to estimate the velocities of micro-bubbles and micro-particles. The measurement shows that the probability distribution of the bubble location in the vicinity of the wall for the three-phase flow is lower than that for the two-phase flow. The measurement also shows that the RMS value of the bubble fluctuation velocity in the streamwise direction for the three-phase flow is high compared with that for the two-phase flow. This is related to the suppression of bubble motion in the wall-normal direction resulting from the existence of particles.
