Study on flow characteristics of micro-bubble two-phase flow

Abstract

Experimental study was carried out on micro-bubble containing bubbly two-phase flow in a circular pipe. Flow resistance in a pipe reduces relative to single-phase flow, especially in the transient region from laminar to turbulent flow. Local velocity profile shows increase of liquid velocity near the wall, and overall velocity profile is planarized with it. Visual observation with high-speed imaging system shows that comparatively large bubbles with slip velocity tend to be observed more frequently near the wall, and this suggests the existence of the interaction between coherent turbulent structure and micro-bubbles.