Bubble formation in a step-emulsification microdevice: hydrodynamic effects in the cavity
Bubble formation in a step-emulsification microdevice: hydrodynamic effects in the cavity
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DOI：
10.1016/j.jiec.2020.12.013
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发表时间：
2021-02
影响因子：
6.1
通讯作者：
Zhiwei Zhang;Zhong-Zheng Wang;F. Bao;Mengyu Fan;Shaokun Jiang;Chunying Zhu;Youguang Ma;Taotao Fu
中科院分区：
文献类型：
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作者：
Zhiwei Zhang;Zhong-Zheng Wang;F. Bao;Mengyu Fan;Shaokun Jiang;Chunying Zhu;Youguang Ma;Taotao Fu
本研究的重点是通过两个角度的摄影方法在一个步骤乳化微装置中产生的气泡。结果表明，在临界毛细管数以下，气泡的生成机制主要受界面张力控制;在临界毛细管数以上，气泡的生成机制主要受粘性力、惯性力和气泡群扰动的控制。采用双角度摄影法，考虑气液界面与壁面的动态接触角，以及通过用空腔内气体体积分数量化阻力来反映空腔对气泡形成的流体动力学反馈，建立了预测气泡尺寸的模型。
This study focuses on the generation of bubbles in a step-emulsification microdevice via a two-angle photography method. It's found that the bubble generation mechanism is controlled by the interfacial tension, below a critical capillary number; while controlled by viscous force, inertial force and the disturbance induced by the bubble swarm, above the critical capillary number. From the two-angle photography method, a model is established for predicting the bubble size, by taking into account of the dynamic contact angle between gas-liquid interface and wall, and the hydrodynamic feedback of the cavity on bubble formation via the quantification of resistance by the volume fraction of gas in the cavity.