水平の狭い矩形拡大流路内の気泡挙動に関する実験

概要

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This study investigates a bubble which is placed such that it bridges a cross section of a horizontal narrow divergent passage under the Earth gravity condition(1-G). In a narrow passage,inertia forces are known to be small compared with viscous forces. Also,gravity force is not dominant for bubble behavior in a horizontal narrow passage under the 1-G condition. In this sense,the bubble behavior in the passage is similar to that under a low-gravity condition. It is important to understand the bubble behavior in relation to separating gas from a gas-liquid two-phase flow and controllong a gas-liquid interfase under a low-gravity condition. A single bubble was placed such that it bridged the cross section of a horizontal narrow passage under 1-G condition. The bubble geometry and its behavior were studied experimentally for gap sizes ranging from 0.5mm to 2mm,divergent angles of 1 to 5 degrees,and using ethyl alcohol as a working fluid. the follwing results were obtained:(1)bubble was found to move to greater cross sectional area,(2)the gas-liquid interface geometry from the top view could be expressed as a "contrant circle model"which takes the maximum radius in the passage,and(3)effects of the gap size and the bubble projected area on the bubble behavior were claified.
一般社団法人日本機械学会の論文
1995-01-25