The principal aim of this study was to analyze the effect of slip velocity at the microchannel wall on an alternating current electrothermal (ACET) flow micropump fitted with several pairs of electrodes. Using the finite element method (FEM), the coupled momentum, energy, and Poisson equations with and without slip boundary conditions have been solved to compute the velocity, temperature, and electrical field in the microchannel. The effects of the frequency and the voltage, and the electrical and thermal conductivities, respectively, of the electrolyte solution and the substrate material, have been minutely analyzed in the presence and absence of slip velocity. The slip velocity was simulated along the microchannel walls at different values of slip length. The results revealed that the slip velocity at the wall channel has a significant impact on the flow field. The existence of slip velocity at the wall increases the shear stress and therefore enhances the pumping efficiency. It was observed that higher average pumping velocity was achieved for larger slip length. When a glass substrate was used, the effect of the presence of the slip velocity was more manifest. This study shows also that the effect of slip velocity on the flow field is very important and must be taken into consideration in an ACET micropump.

中文翻译：

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交流电热微型泵中滑移速度效应的模拟。

这项研究的主要目的是分析微通道壁上的滑移速度对装有几对电极的交流电热（ACET）流量微型泵的影响。使用有限元方法（FEM），求解了带有和不带有滑移边界条件的耦合动量，能量和泊松方程，以计算微通道中的速度，温度和电场。在存在和不存在滑动速度的情况下，已经分别仔细分析了电解质溶液和基底材料的频率和电压的影响以及电导率和导热率。沿微通道壁以不同的滑移长度值模拟滑移速度。结果表明，壁通道处的滑移速度对流场有重大影响。壁上滑移速度的存在增加了剪切应力，因此提高了泵送效率。观察到，对于较大的滑移长度，实现了较高的平均泵送速度。当使用玻璃基板时，滑移速度的存在的影响更加明显。该研究还表明，滑移速度对流场的影响非常重要，在ACET微型泵中必须予以考虑。滑移速度的存在的影响更加明显。该研究还表明，滑移速度对流场的影响非常重要，在ACET微型泵中必须予以考虑。滑移速度的存在的影响更加明显。该研究还表明，滑移速度对流场的影响非常重要，在ACET微型泵中必须予以考虑。