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针对传统微机械开关存在信号跳变、触点易磨损等缺点,设计了一种基于MEMS技术的水银微流体惯性开关。为了更准确地反映微通道中水银液滴在惯性力作用下的动态响应历程,基于Bracke、Jiang和Seebergh动态接触角模型编写用户自定义函数(UDF),并根据VOF-CSF多相流数值计算方法,采用FLUENT软件讨论了动态接触角对开关阈值特性和响应时间的影响,模拟了水银液滴在微通道中连续变形的动态过程。仿真结果表明,分别采用Bracke、Jiang和Seebergh模型所得阈值加速度之间的偏差较小,另外与设置静态接触角相比,三种不同模型使得阈值加速度分别增大了4.3%、3.2%和5.4%。
Aiming at the shortcomings of traditional micro-mechanical switches, such as signal jump and easy contact wear, a MEMS-based mercury microfluidic inertial switch was designed. In order to more accurately reflect the dynamic response of mercury droplets in the microchannels under inertial force, a user-defined function (UDF) was prepared based on the dynamic contact angle model of Bracke, Jiang and Seebergh. Based on the numerical calculation of the multiphase flow of VOF-CSF Method, the influence of dynamic contact angle on the switching threshold characteristics and response time was discussed by FLUENT software, and the dynamic process of continuous deformation of mercury droplets in microchannels was simulated. The simulation results show that the difference between the threshold accelerations obtained by the Bracke, Jiang and Seebergh models is small, and the three different models increase the threshold accelerations by 4.3%, 3.2% and 5.4% respectively compared with the static contact angles. .