Kim Dong, Kim Dae Yeon, Shim Jaesool, Kim Kyung Chun
Rolls-Royce University Technology Center, Pusan National University, Busan, 46241, Republic of Korea.
School of Mechanical Engineering, Pusan National University, Busan, 46241, Republic of Korea.
Sci Rep. 2021 Dec 6;11(1):23426. doi: 10.1038/s41598-021-02964-y.
A liquid droplet oscillating between two plane electrodes was visualized, and the electrical power generation based on the reverse-electrowetting-on-dielectric (REWOD) phenomenon was measured. For the upper plate, a hydrophobic surface treated by PTFE was used, and the lower plate was tested using the hydrophilic surface properties of ITO glass. To analyze the dynamic behavior of an oscillating liquid bridge, a modeling study was carried out using the phase field method based on the finite element method. The dynamic contact angle of the oscillating liquid bridge was modeled based on advancing and receding contact angles. The variable interfacial areas between the liquid and solid surfaces were calculated and agreed well with the experimental results within a 10% error band. Furthermore, experimental and analytical studies were carried out to examine the REWOD energy harvesting characteristics of the glycerol-water mixtures in various concentrations. As a result, the peak voltage output was obtained at a specific concentration of the glycerol mixture, and the power density of the oscillating liquid bridge at this point was up to 2.23 times higher than that of pure water.
可视化了在两个平面电极之间振荡的液滴，并测量了基于介电反向电润湿（REWOD）现象的发电情况。上极板使用经聚四氟乙烯处理的疏水表面，下极板利用氧化铟锡（ITO）玻璃的亲水表面特性进行测试。为了分析振荡液桥的动态行为，基于有限元法采用相场法进行了建模研究。基于前进和后退接触角对振荡液桥的动态接触角进行了建模。计算了液固表面之间的可变界面面积，其与实验结果在10%的误差范围内吻合良好。此外，还进行了实验和分析研究，以考察不同浓度甘油 - 水混合物的REWOD能量收集特性。结果，在甘油混合物的特定浓度下获得了峰值电压输出，此时振荡液桥的功率密度比纯水高出2.23倍。
