D111 ベンチュリ管式微細気泡発生装置のボイド率特性 : 定電流法を用いたボイド率計測(OS9 混相流動),動力エネルギーシステム部門20周年,次の20年への新展開)

概要

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Recently, microbubbles are utilized in various engineering fields. We focus on one of the microbubble generator which is shaped a Venturi tube. Microbubbles are generated with breakup of bubbles due to the rapid pressure recovery in it even under the high void fraction conditions. In order to clarify the mechanism of the bubble breakup and to optimize the generator to apply in various fields, changing of void fraction through a Venturi tube and the generated bubbly are necessary. We applied an electro-void fraction meter proposed in nuclear power engineering field to measure void fraction of microbubbles. The principle of the meter is that electrical resistance of air-water two-phase flow changes with the void fraction. In this study, we discussed possibility of measurement of bubbly flow with microbubbles by Constant-Electric-Current-Method (CECM) and effectiveness of Maxwell's theory. As a result, it was confirmed that the void fraction measurement of microbubbles with the present method was possible with Maxwell's theory which is used for estimation of the correlation between void fraction and resistance.
2010-06-20