Wang Meng, Kong Chuang, Liang Qisen, Zhao Jianxiang, Wen Maolin, Xu Zhongbin, Ruan Xiaodong
Institute of Process Equipment, College of Energy Engineering, Zhejiang University Zheda Road No.38 Hangzhou 310027 China
The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University Hangzhou 310007 China
RSC Adv. 2018 Sep 25;8(58):33042-33047. doi: 10.1039/c8ra06837b. eCollection 2018 Sep 24.
Terrace-based microfluidic devices are currently used to prepare highly monodisperse micro-droplets. Droplets are generated due to the spontaneous pressure drop induced by the Laplace pressure, and so the flow rate of a dispersed phase has little effect on droplet size. As a result, control over the droplet is limited once a step emulsification device has been fabricated. In this work, a terrace model was established to study the effect of the wall contact angle on droplet size based on computational fluid dynamics simulations. The results for contact angles from 140° to 180° show that a lower contact angle induces wall-wetting, increasing the droplet size. The Laplace pressure equations for droplet generation were determined based on combining pressure change curves with theoretical analyses, to provide a theoretical basis for controlling and handling droplets generated through step emulsification.
基于台阶的微流控装置目前用于制备高度单分散的微滴。由于拉普拉斯压力引起的自发压降而产生微滴，因此分散相的流速对微滴尺寸影响很小。因此，一旦制造出台阶乳化装置，对微滴的控制就会受到限制。在这项工作中，基于计算流体动力学模拟建立了一个台阶模型，以研究壁面接触角对微滴尺寸的影响。接触角在140°至180°范围内的结果表明，较低的接触角会导致壁面湿润，从而增大微滴尺寸。通过将压力变化曲线与理论分析相结合，确定了用于微滴生成的拉普拉斯压力方程，为控制和处理通过台阶乳化产生的微滴提供了理论依据。
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