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建立了一种对称电极组交流电渗流微泵结构,通过改变相邻电极间的AC信号相位,可以方便地实现对微通道流向的控制。根据双电层离子数的空间位阻效应修正,数值求解了双电层Poisson-Boltzmann方程和液体流动Navier-Stokes方程,得到了对称电极组交流电渗微泵的流动特性。分析了微泵流速与交流电压幅值、频率等参数的关系特性,并与双电层Debye-Hückel线性解进行比较。结果表明,空间位阻效应修正在低电压时与Debye-Hückel线性解一致,但是在高电压时会产生高频反向流。
A kind of symmetrical electrode group AC micro-pump structure was established. By changing the phase of AC signal between adjacent electrodes, the control of micro-channel flow can be conveniently realized. According to the steric hysteresis effect of the electric double-layer ion number, Poisson-Boltzmann equation and Navier-Stokes equation of the electric double layer are numerically solved, and the flow characteristics of the AC / The relationship between the flow rate of micropump and the amplitude and frequency of AC voltage was analyzed and compared with the Debye-Hückel linear solution. The results show that the steric hysteresis correction is consistent with the Debye-Hückel linear solution at low voltages, but produces high-frequency reverse currents at high voltages.