H104 単一ジグザグ上昇気泡の運動メカニズム(OS11 温暖化対策とCO_2削減技術)

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In the present study, the motion mechanism of a single zigzag bubble and the relations with the mass transfer process were experimentally investigated. To clarify the motion mechanism, we focused on a relation between the periodical bubble surface oscillation (bubble shape deformation at side edges) and the dynamical wake motion defined as PPHVL (Position of the point of the hairpin like vortex leg). We visualized the bubble dissolution process via LIF/HPTS combined with IST method and obtained quantitative knowledge of them. We discuss a relation between them. Furthermore, a relation between the wake motion and the lift force (calculated from the displacement of the gravity center) was investigated. Based on these results, we concluded that the wake motion, so called wake instability characterized the zigzag motion; i.e. the wake instability induces the lift force acting on the bubble. The relationship between the zigzag motion and the mass transfer process was also discussed.
一般社団法人日本機械学会の論文
2011-06-22