乱流境界層中に噴出した気流からの気泡分離機構に関する研究 : 単独気泡の分離機構(流体工学,流体機械)

概要

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The purpose of this study is to evaluate the diameter of small bubbles separated from an air jet injected into a turbulent boundary layer from a hole on the wall. There exist three patterns of bubble separation dependent on the jet velocity, i.e., single bubble, coalesced bubbles, and continuous air jet. The mechanism of bubble separation from the jet is theoretically considered for the single bubble region. First, the bubble volume is calculated when the force separating the bubble such as drag or lift from the free stream overcomes the surface tension acting on the wall. The total volume of separating bubble is estimated from the sum of the volume stated above and that supplied to the bubble during the separation process influenced by the surface tension. The diameter of single bubble was measured for various experimental conditions. The results are approximated well by those obtained from the theoretical consideration proposed in this study.
社団法人日本機械学会の論文
2009-06-25