Numerical study on dynamic behaviors of the coalescence between the advancing liquid meniscus and multi-droplets in a microchannel using CLSVOF method
Numerical study on dynamic behaviors of the coalescence between the advancing liquid meniscus and multi-droplets in a microchannel using CLSVOF method
复制标题
采用 CLSVOF 方法对微通道中前进液体弯月面与多液滴之间聚结的动态行为进行数值研究
DOI：
10.1016/j.compfluid.2018.05.014
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发表时间：
2018-07
影响因子：
2.8
通讯作者：
Zhang Biao
中科院分区：
文献类型：
--
作者：
Wang Zhibin;Li Shuzhe;Chen Rong;Zhu Xun;Liao Qiang;Ye Dingding;Zhang Biao
在液体充填过程和基于光热效应的微器件中，经常会遇到推进的液体弯月面与多个液滴之间的聚结。为了阐明推进的液体弯月面与多个液滴之间的结合对液体弯月面推进的影响，本文采用耦合Level Set和流体体积(CLSVOF)方法和连续介质表面力(CSF)模型对其动力学行为进行了数值研究。重点研究了聚结过程中的动态界面现象。还研究了液滴及其体积分布的影响。模拟结果表明，由于诱导了大曲率的凹面，推进的液体弯月面与每个液滴之间的融合能够瞬间加速原始液体的流动。与单液滴聚结相比，多液滴同时聚结时，界面的起伏和变形更大，从而可以进一步降低平均液体压力，从而显示出更显著的液体流动推进。当四个液滴同时与推进的液体弯月面汇合时，速度增量比最大。结果表明，大液滴的聚结由于提供了更多的表面能而导致了较大的速度增量比。推进液段在与液滴汇合之前过长，会削弱推进效果。模拟结果的总体变化趋势与实验结果基本一致。
The coalescence between the advancing liquid meniscus and multiple droplets is usually encountered in the liquid filling process and photothermal effect based microdevices. To shed light on how the coalescence between the advancing liquid meniscus and multiple droplets affects the liquid meniscus advancement, its dynamic behaviors are numerically investigated using the coupled level set and volume-of-fluid (CLSVOF) method along with the continuum surface force (CSF) model in this study. Particular attention is paid to the dynamic interfacial phenomena during the coalescence process. The effect of the droplet and its volume distributions is also investigated. The simulation results show that the coalescence between the advancing liquid meniscus and each droplet is able to instantly accelerate the original liquid flow as a result of the induced concave meniscus with large curvature. As compared to the coalescence with a single droplet, the fluctuation and deformation of the interface is stronger in the case of simultaneous coalescence with multiple droplets, which can further lower the average liquid pressure and thus show more significant advancement of the liquid flow. The velocity increment ratio is the largest when four droplets simultaneously coalesce with the advancing liquid meniscus. It is shown that the coalescence with large droplet can result in large velocity increment ratio because more surface energy is supplied. Large length of the advancing liquid segment before its coalescence with the droplets can weaken the advancing effect. It is also found that the overall variation trend of the simulation results is in agreement with that of the experimental results.
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