To explore the optoelectronic wetting droplet transport mechanism, a transient numerical model of optoelectrowetting (OEW) under the coupling of flow and electric fields is established. The study investigates the impact of externally applied voltage, dielectric constant of the dielectric layer, and interfacial tension between the two phases on the dynamic behavior of droplets during transport. The proposed model employs an improved Young's equation to calculate the instantaneous voltage and contact angle of the droplet on the dielectric layer. Results indicate that, under the influence of OEW, significant variations in the interface contact angle of droplets occur in bright and dark regions, inducing droplet movement. Moreover, the dynamic behavior of droplet transport is closely associated with various parameters, including externally applied voltage, dielectric layer material, and interfacial tension between the two phases, all of which impact the contact angle and, consequently, the transport process. By summarizing the influence patterns of the three key parameters studied, the optimization of droplet transport performance is achieved. The study employs two‐dimensional simulation models to emulate the droplet motion under the influence of the electric field, investigating the OEW droplet transport mechanism. The continuous movement of droplets involves three stages: initial wetting, continuous transport, and reaching a steady position. The findings contribute theoretical support for the efficient design of digital microfluidic devices for OEW droplet movement and the selection of key parameters for droplet manipulation.

中文翻译：

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光电润湿液滴传输机制的研究

为了探索光电润湿液滴传输机制，建立了流场耦合下的光电润湿（OEW）瞬态数值模型。该研究研究了外部施加的电压、介电层的介电常数以及两相之间的界面张力对液滴在传输过程中动态行为的影响。该模型采用改进的杨氏方程来计算介电层上液滴的瞬时电压和接触角。结果表明，在OEW的影响下，亮区和暗区的液滴界面接触角发生显着变化，从而引起液滴运动。此外，液滴传输的动态行为与各种参数密切相关，包括外部施加的电压、介电层材料和两相之间的界面张力，所有这些都会影响接触角，从而影响传输过程。通过总结所研究的三个关键参数的影响模式，实现了液滴传输性能的优化。该研究采用二维仿真模型来模拟电场影响下的液滴运动，研究OEW液滴传输机制。液滴的连续运动涉及三个阶段：初始润湿、连续传输和到达稳定位置。研究结果为有效设计用于 OEW 液滴运动的数字微流控装置以及液滴操纵关键参数的选择提供了理论支持。