G203 気大口径管内気泡流におけるボイド率の時空間変動と液相流動構造の関係(GS-2 キャビテーション・マイクロバブル・数値計算1,一般セッション)

概要

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Quantitatively characterizing long-period fluctuations, which reflect the large-scale structure of a bubbly flow in a bubble column reactor, is essential to improving the reactor efficiency. First, in order to extract long-period fluctuations of bubbly flow, we proposed a newly developed method to extract the long-period fluctuations based on point-wise void fraction measurements. Analyzing the time-series point-wise void fractions measured via Four-Tip Optical-fiber Probe (F-TOP), we demonstrate that the long-period fluctuations can be extracted via wave form analysis. Second, we measured point-wise liquid-phase motion via Laser Doppler Anemometry (LDA) at the same time with the point-wise void fraction measurements. As a result, we observed that the characteristic bubble-swarm forms surrounding liquid-phase motion.
2009-11-06