J055011 3次元気泡後流の可視化と物質移動([J05501]混相流の多次元ビジュアリゼーション〜流動場の光・電磁場・超音波センシング〜)

概要

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For a deep understanding of a bubbly flow, a detailed knowledge of a single bubble motion is essential. A purpose of the present study is to discuss a motion mechanism of the zigzag motion and its relations with the mass transfer. The dimensionless bubble properties, Deg, Re and We, are 2.9 [mm], 850 [-] and 3.4 [-], respectively. We focused on a relation between the bubble motion and the wake motion. In order to visualize them, we employed LIF/HPTS method (the wake and the dissolution process) combined with IST method (the bubble motion). For the pseudo 3-D visualization of the wake, the method was retrofitted with two high-speed cameras and tomographic measurement system. At first we qualitatively discuss a relation between the bubble motion and the wake motion. Secondly we quantified them by employing our original definitions, and then, the quantitative relation between them is discussed. Based on the discussions, we suggest a mechanism of the bubble motion; i.e. the difference between the linear motion and the zigzag motion. Finally, a relation between the flow structure including bubble and the mass transfer was quantitatively discussed.
一般社団法人日本機械学会の論文
2011-09-11