マイクロ気泡流とその圧力損失特性

概要

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A "Micro-bubble" means the minute air bubbles which diameter are 10-40 micrometers on generating. Since the diameter of air bubble is very small, the gas-liquid mixture including micro-bubbles has many useful characteristics such as high dissoloved oxygen and high fluidity. Therefore micro-bubbles have been used in mainly fishery and improvement of water quality. In the present study, micro-bubbles were used in a pipe, and frictional pressure drops were investigated. The volumetric fluxes of liquid phase and gas phase were <j_L>=0.104-0.924 m/s and <j_G>=4.38×10^<-5>-1.17×10^<-3> m/s, respectively. As a result, reduction of pressure drop was occurred and it was about 40-50% in the turbulent flow region. The qualitative tendency was clarified in the relation between friction coefficient of pipe, λ ,and Reynolds number, Re. The value of λ. decreased with increasing <j_L> or <j_G>. The decrement by <j_G> was much larger than that by <JL>.
神戸市立工業高等専門学校の論文
2004-03-01