Theoretical investigation of droplet splitting due to electrowetting on dielectric in a Hele-Shaw cell
Theoretical investigation of droplet splitting due to electrowetting on dielectric in a Hele-Shaw cell
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DOI：
10.1063/5.0095846
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发表时间：
2022-06
影响因子：
4.6
通讯作者：
K. Katoh;T. Wakimoto;T. Ito;Jyobu Matsuura
中科院分区：
文献类型：
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作者：
K. Katoh;T. Wakimoto;T. Ito;Jyobu Matsuura
在这项研究中，我们研究了电介质上的电润湿（EWOD）诱导的分裂行为的液滴放置在Hele-Shaw细胞。实验观察了不同外加电压下液滴的变形行为。提出了一个理论模型来表达液滴的行为平衡的表面张力，粘性力，和压力作用的液滴。考虑了动态接触角的影响，并利用动态接触角估算了沿着移动接触线上的毛细力。从理论模型中得到的结果与所观察到的液滴的变形行为定性一致。提出了一个近似模型来验证观察结果，该观察结果表明，在正电极和负电极之间的边界处的接触线宽度在分裂过程中保持几乎恒定。基于分裂过程中液滴变形所需的最小功，使用该模型解释了接触线宽度的行为。
In this study, we investigated the electrowetting on dielectric (EWOD)-induced splitting behavior of droplets placed in a Hele-Shaw cell. The deformation behavior of the droplet was experimentally observed under various applied voltages. A theoretical model was proposed to express droplet behavior by balancing the surface tension, viscous force, and pressure acting the droplet. The effect of the dynamic contact angle was considered and used to estimate the capillary force along on the moving contact line. The results obtained from the theoretical model showed a qualitative agreement with the deformation behavior of the observed droplets. An approximate model was proposed to verify the observations that demonstrated that the contact line widths at the boundary between the positive and negative electrodes remain almost constant during the splitting process. The behavior of the contact line width was explained using the model, based on the minimum work required for droplet deformation during the splitting process.