Shapes and Rising Velocities of Single Bubbles rising through an Inner Subchannel

概要

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Shapes and velocities of single air bubbles rising through stagnant and flowing waters in an inner subchannel are measured by making use of fluorocarbon tubes. It is confirmed that (1) bubble shapes and motions in the subchannel are by far different from those in simple geometry, and they depend on the ratio λ of the bubble diameter to the subchannel hydraulic diameter, (2) when λ>0.9, a part of a bubble intrudes into neighboring subchannels, and thereby a kind of void drift takes place even with a single bubble, (3) the terminal velocity VT of a small bubble (λ<0.9) is accurately predicted by a theoretical model proposed by Tomiyama et al., (4) an empirical correlation of VT for cell-Taylor bubbles (λ>0.9) is presented, and (5) the rising velocity VB in laminar and turbulent flow conditions are well evaluated by substituting the proposed VT models and the ratio of the maximum liquid velocity to the mean liquid velocity into the Nicklin correlation.
社団法人日本原子力学会の論文
2003-03-25