基于电热耦合效应的插入式电极有限元仿真及优化

Finite element simulation and optimization of insertion electrode based on electrothermal coupling effect

为提高插入式电极的测量精度,减小测试区域电场及焦耳热对纳米颗粒Zeta电位测量结果稳定性的影响,通过对插入式电极进行多物理场的数值模拟,研究电极底部极片结构布置对测试区域电场及温度分布的影响,并通过实验对所选电极结构进行验证。结果表明:当插入式电极极片长度为8 mm,极片宽度为6 mm,极片间距为4 mm时测试结果的标准偏差更小,所检测颗粒Zeta电位的标准差为0.98 mV,测试稳定性及测量精度更高。

In order to improve the measurement accuracy of the insertion electrode and reduce the influence of electric field and Joule heat on the stability of Zeta potential measurement results,multi-physical field numerical simulation of the insertion electrode was carried out to study the influence of the electrode bottom electrode layout on the electric field and temperature distribution in the test area,and the accuracy and stability of the selected electrode were verified by experiments.The results show that when the electrode length is 8 mm,the electrode width is 6 mm,and the electrode spacing is 4 mm,the standard deviation of the test results is smaller.The standard deviation of Zeta potential was 0.98 mV and the insertion electrode has better stability and accuracy.