Experimental and Numerical Studies on Microbubble Generation and Flow Behavior in a Microchannel with Double Flow Junctions

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• 作者：Dongren Liu ; Xiang Ling ; Hao Peng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：November 30, 2016
• 年：2016
• 卷：55
• 期：47
• 页码：12276-12286
• 全文大小：724K
• ISSN：1520-5045

文摘

Experimental visualizations and numerical simulations were carried out to investigate the bubble generation mechanisms in a microchannel with double flow junctions. Two kinds of flow patterns could be observed from the experiments and simulations: slug-bubble flow and split flow. When 0.00554 < Ca₂ < 0.025 and 0.25 < Q_G/Q_L < 6, slug-bubble flow can be observed. When Ca₂ < 0.00554 and 6 ≤ Q_G/Q_L ≤ 8, split flow will occur. Bubble length and velocities were also analyzed experimentally and theoretically. The relationship between bubble length, Ca and flow rate ratio Q_G/Q_L was obtained by regression, and the correlation could predict the data within an RMS error of 20%. Bubble velocity data correlated with the drift flux model showed that the distribution parameter of the two flow junctions C₀₁ andC₀₂ had values of 1.0654 and 1.1123, respectively.