Abstract A simple and effective method was conducted for preparing microdispersed droplets with decreased size and increased uniformity, in which phase inversion in high-phase-ratio liquid/liquid system was combined with addition of microbubbles. Five typical flow patterns were observed, including W/O, O/W/O, transition regime, O/W and G/W/O regimes. Flow regime transition was observed, according to which physical properties of systems and operating conditions for preparing single-oil-droplet-in-water emulsion were determined in different liquid/liquid and gas/liquid/liquid modes. Effects of liquid viscosities as well as interfacial tension on droplet size (DO) and its standard deviation (SD) were studied systematically and the most effective gas/liquid/liquid mode was recommended. Mathematical models were established for correlating DO in five different modes, which show relatively good agreement with experimental results. DO decreases by 42% via introducing phase inversion and further reduces to 25% by addition of microbubbles, both under the same operating conditions.

中文翻译：

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在气/液/液微分散体系中通过相转化制备微分散液滴

摘要 通过在高相比液/液体系中的相转化与添加微泡相结合，提出了一种简单有效的制备尺寸减小、均匀性增加的微分散液滴的方法。观察到五种典型的流动模式，包括 W/O、O/W/O、过渡状态、O/W 和 G/W/O 状态。观察流态转变，根据流态转变，在不同的液/液和气/液/液模式下确定制备水包单油滴乳液的体系的物理性质和操作条件。系统研究了液体粘度和界面张力对液滴尺寸 (DO) 及其标准偏差 (SD) 的影响，并推荐了最有效的气/液/液模式。建立了五种不同模式下DO相关的数学模型，与实验结果吻合较好。在相同的操作条件下，通过引入相转化使溶解氧减少 42%，通过添加微泡进一步减少到 25%。