微流道交流电水力泵的数值模拟及优化

The Simulation and Optimization on AC Electro Hydrodynamic Pumping in Microchannels

描述了微通道内交流电水力泵(EHD)的工作原理,并用IntelliSuite的Microfluidic模块对电水力泵进行数值模拟.并分析了影响电水力泵速度场分布的因素,包括流体电导率、驱动交流电频率和相位、电极维度以及电极间隙和数量等.通过数值模拟不同参数下的电水力泵,比较驱动压力大小,最后给出优化的设计结果,为给电水力泵设计参数的选择提供依据.本文对流道长度为5mm,宽0.4mm,厚度0.4mm的电水力泵做了优化设计的数值模拟,最后得到驱动电极宽度为0.01mm,电极间距为0.02mm.

This paper describes the principle of AC Electrohydrodynamic （EHD） pumping in microchannels, the application of IntelliSuite Microfluidic module on EHD pumps simulation, and the analyses of the factors that influence the fluid velocity of EHD pump, including the conductivity of the fluid, the frequency of the driving AC voltage, the phase of the driving signal, the dimensions of the electrode, the gap between the electrodes and the number of driving electrodes. The optimized results attained from the comparison of different pumping pressure based on simulations with different parameters have provided a dependence to choose the parameters for the EHD pump. The EHD pump is designed as a microchannel with a length of 5mm, a width of 0.4 mm and a thickness of 0.4 mm. Through the optimized simulation of this EHD pump, the width of the driving electrodes presented at the bottom of the channel is 0.01 mm and the gap between the electrodes is 0.02 mm.