Behavior of Two-Dimensional Aerated Bubbly Flows within a Narrow Duct When a Water Jet Is Vertically Injected into a Cahm Water. 2nd Report. Void Fraction and Bubble Distribution.

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In order to clarify the draft-tube-performance of cross-flow-turbines or the submerged-water-jet-performance, in the same two-dimensional aerated-bubbly-flow within a narrow duct reported previously, we experimentally systematically investigate the characteristic behavior of the mean-and the local-void fraction, of the vortical flow and of the bubble distribution, when the jet is vertically injected. It is shown that the mean-void fraction is a control parameter of the hydraulic losses, when the jet velocity is low. The intermediate vortical flow containing huge number of very fine bubbles often results in circulating string bubbles and fluctuates periodically at about 0.6s in period. Owing to the Daily's effects, the bubbles in the up-flow and in the down-flow are considerably concentrated into the intermediate vortical flow.
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