Electrokinetic actuation of low conductivity dielectric liquids

Rohan Raghavan, Jiaxing Qin, Leslie Y. Yeo, James R. Friend, Kenjiro Takemura, Shinichi Yokota, Kazuya Edamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

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 tbe 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.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
Pages459-466
Number of pages8
EditionPART A
DOIs
Publication statusPublished - 2008 Dec 1
Event6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008 - Darmstadt, Germany
Duration: 2008 Jun 232008 Jun 25

Publication series

NameProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
NumberPART A

Other

Other6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
CountryGermany
CityDarmstadt
Period08/6/2308/6/25

ASJC Scopus subject areas

  • Process Chemistry and Technology

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  • Cite this

    Raghavan, R., Qin, J., Yeo, L. Y., Friend, J. R., Takemura, K., Yokota, S., & Edamura, K. (2008). Electrokinetic actuation of low conductivity dielectric liquids. In Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008 (PART A ed., pp. 459-466). (Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008; No. PART A). https://doi.org/10.1115/ICNMM2008-62239