The effects of ultrasound on the hydrodynamic and mass transfer behaviors of immiscible liquid–liquid two-phase flow was investigated in a domestic ultrasonic microreactor. Under ultrasonic irradiation, cavitation bubble was generated and underwent violent oscillation. Emulsification of immiscible phases was initiated by virtue of oscillating bubbles shuttling through the water/oil interface. The pressure drop was found to decrease with increasing ultrasound power, with a maximum decrement ratio of 12% obtained at power 30 W. The mass transfer behavior was characterized by extraction of Rhodamine B from water to 1-octanol. An enhancement factor of 1.3–2.2 on the overall mass-transfer coefficient was achieved under sonication. The mass transfer performance was comparable to passive microreactor at similar energy dissipation rate (61–184 W/kg). The extraction equilibrium was reached under a total flow velocity 0.01 m/s and input power 20 and 30 W, exhibiting its potential use in liquid-liquid extraction process. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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超声微反应器中的液-液两相流：空化，乳化和传质增强

在家用超声微反应器中研究了超声对不相溶的液-液两相流的流体力学和传质行为的影响。在超声辐射下，产生空化气泡并经历剧烈振荡。不混溶相的乳化是通过振荡气泡在水/油界面中穿梭而引发的。发现压降随超声功率的增加而降低，在功率30 W时最大降压比为12％。传质行为的特征是从水中罗丹明B萃取到1-辛醇中。在超声处理下，总传质系数提高了1.3–2.2。在相似的能量耗散率（61–184 W / kg）下，传质性能可与无源微反应器相媲美。在总流速为0.01 m / s且输入功率为20和30 W的情况下达到了萃取平衡，显示了其在液-液萃取过程中的潜在用途。©2017美国化学工程师学会AIChE的Ĵ，2017年