Bubble splitting under gas-liquid-liquid three-phase flow in a double T-junction microchannel
Bubble splitting under gas-liquid-liquid three-phase flow in a double T-junction microchannel
复制标题
双T形连接微通道内气-液-液三相流下的气泡分裂
DOI：
10.1002/aic.15920
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发表时间：
2018-01-01
期刊：
影响因子：
3.7
通讯作者：
Chen, Guangwen
中科院分区：
文献类型：
--
作者：
Liu, Yanyan;Yue, Jun;Chen, Guangwen
在具有双T形结的微通道中产生了气-水-液-油三相流动。在第二个T结(T2)处分散水相的挤压下，研究了第一个T结(T1)产生的气泡的分裂。在气泡裂解过程中，上游油气两相流和T2处的水相流呈反相波动，根据操作条件的不同，气泡的下游和上游瞬时速度之间存在独立或同步的关系。与两相流相比，引入了修正的毛细管数和上行速度与水相速度之比来预测气泡破裂时间。由此提出了子体气泡/弹状物的临界气泡破碎长度和尺寸规律。这些结果为设计精确操纵气液液三相流的微通道结构提供了重要指导，在化学合成等领域具有潜在的应用前景。(C)2017美国化学工程师学会学报，63：376-388,2018
Gas-aqueous liquid-oil three-phase flow was generated in a microchannel with a double T-junction. Under the squeezing of the dispersed aqueous phase at the second T-junction (T2), the splitting of bubbles generated from the first T-junction (T1) was investigated. During the bubble splitting process, the upstream gas-oil two-phase flow and the aqueous phase flow at T2 fluctuate in opposite phases, resulting in either independent or synchronous relationship between the instantaneous downstream and upstream bubble velocities depending on the operating conditions. Compared with two-phase flow, the modified capillary number and the ratio of the upstream velocity to the aqueous phase velocity were introduced to predict the bubble breakup time. The critical bubble breakup length and size laws of daughter bubbles/slugs were thereby proposed. These results provide an important guideline for designing microchannel structures for a precise manipulation of gas-liquid-liquid three-phase flow which finds potential applications among others in chemical synthesis. (c) 2017 American Institute of Chemical Engineers AIChE J, 63: 376-388, 2018