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在交流电渗流(ACEO)泵的研究中,一般采用Debye-Huckel(D-H)线性近似法。但该方法只在电压很小时才成立,这和实际情况不符;此外,交流电渗流泵在大电压、高频率下的反向流现象也不能由D-H近似法给出正确的预测。当电压较大时,一般采用非线性的Poisson-Boltzmann(P-B)模型。但是,P-B模型也无法对交流电渗流泵在大电压、高频率下的反向流现象进行预测。在P-B模型中,溶液粒子被当作一个空间点,忽略了粒子间的相互作用以及粒子本身的空间体积效应。实际的粒子都有一定的空间体积,当电压较大、溶液浓度较高时,粒子的空间体积不应被忽略。由于粒子的空间体积,通过引入粒子空间效应对P-B模型进行修正后,给出了交流电渗流泵在较大电压下的数值模型,并对交流电渗流泵在较大电压下的高频率反向流现象进行了成功的预测。
In the study of ACO pumps, Debye-Huckel (D-H) linear approximation is generally used. However, this method is only valid when the voltage is very small, which is not in accordance with the actual situation. In addition, the reverse flow phenomenon of AC pumps at high voltage and high frequency can not be correctly predicted by D-H approximation. When the voltage is larger, the non-linear Poisson-Boltzmann (P-B) model is generally used. However, the P-B model can not predict the reverse flow phenomenon of AC pumps at high voltage and high frequency. In the P-B model, the solution particles are treated as a space point, ignoring the interaction between the particles and the space volume effect of the particles themselves. The actual particles have a certain volume of space, when the voltage is large, the solution concentration is high, the particle volume should not be neglected. Due to the space volume of the particle, the PB model is modified by introducing the particle space effect, and the numerical model of the AC pump at high voltage is given. The high frequency reverse flow of the AC pump at higher voltage is also given A successful prediction was made.