鉛直管内に設けられたオリフィス近傍での単一上昇気泡に関する２次元数値シミュレーション
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概要
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The purpose of this paper is to numerically investigate behavior of a rising bubble near an orifice set in a stagnant water-filled vertical pipe. The orifice is selected in two kinds of the contraction ratio β between the pipe diameter <I>D</I> and the orifice one <I>D<SUB>0</SUB>:β=D<SUB>0</SUB>⁄D</I>=0.4 and 0.7. The rising bubble, of the area equivalent diameter being <I>d<SUB>B</SUB>=0.5 D</I>, whose wake-width is wider than <I>D</I> moves upward through the orifice of β = 0.7 with being elongated and contracted, whereas a small bubble of <I>d<SUB>B</SUB> = 0.25 D = 0.36 D<SUB>0</SUB> totally behaves like a bubbly flow even inside the orifice (i.e., the bubble rises with a zigzag motion). At the contraction ratio of β = 0.4, two kinds of patterns are successfully observed for a bubble captured at the orifice; (i) the bubble is settled behind the orifice under a hydrophilic condition, (ii) the bubble is settled inside the orifice under a hydrophobic condition. The physical discussion is addressed on the force balance of the meniscus.
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