Electrokinetic Actuation of Low Conductivity Dielectric Liquids-猫眼课题宝

DOI：

10.1115/icnmm2008-62239

发表时间：

2009-06

期刊：

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

R. Raghavan;Jiaxin Qin;L. Yeo;J. Friend;K. Takemura;S. Yokota;K. Edamura

对于在电场存在下驱动介电流体的电流体动力学现象的起源存在一定程度的混乱。先前的研究已经考虑了传导泵浦、离子拖曳泵浦和感应泵浦作为驱动机制的可能性，但忽略了麦克斯韦（电）压力驱动流的可能性。直到最近，人们对这一机制知之甚少，因此常常被忽视。本文演示了麦克斯韦压力梯度如何在存在非均匀场的情况下引起介电液体中的流动。我们根据使用润滑理论的第一原理推导出流速的表达式，该表达式表现出对所施加电压的二次依赖性，并且与介电常数和粘度之比成比例。理论预测得到了实验结果的支持。尽管我们已经研究了一类特定介电液体的现象，但据信这种机制很可能是导致先前归因于传导或离子拖曳泵送的其他低电导率介电流体的驱动的原因。无论如何，我们都会讨论通过比较给定类型流量的显着特征来识别主导机制的方法。版权所有 © 2008 ASME

There has been some amount of confusion over the origin of electrohydrodynamic phenomena responsible for the actuation of dielectric fluids in the presence of an electric field. Previous studies have accounted for the possibility of conduction pumping, ion drag pumping and induction pumping as driving mechanisms but have ignored the possibility of Maxwell (electric) pressure driven flow. Until recently, this mechanism has been poorly understood and as a result has often been overlooked. This paper demonstrates how a Maxwell pressure gradient can induce flow in dielectric liquids in the presence of a non-uniform field. We derive, from first principles using lubrication theory, an expression for the flow velocity which exhibits a quadratic dependence on the applied voltage and also proportionality to the ratio of the permittivity and viscosity. The theoretical predictions are supported by experimental results. Although we have examined the phenomenon for a particular class of dielectric liquids, it is believed that this mechanism could well be responsible for the actuation of other low conductivity dielectric fluids previously attributed to conduction or ion drag pumping. In any case, we discuss ways to identify the dominant mechanism by comparing the salient features for a given type of flow.Copyright © 2008 by ASME

Electrokinetic Actuation of Low Conductivity Dielectric Liquids

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