Differences in the electrorheological response of a particle suspension under direct current and alternating current electric fields |
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| Authors: | H See A Kawai F Ikazaki |
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| Institution: | (1) Department of Chemical Engineering The University of Sydney NSW 2006, Australia e-mail: howards@chem.eng-usyd.edu.au Tel.: +61 2 9351 38 32 Fax: +61 2 9351 2854, AU;(2) Institute for Materials and Chemical Process AIST Tsukuba Central 5 Higashi 1-1-1 Tsukuba Ibaraki 305-8565, Japan, JP |
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| Abstract: | We have observed an unusual reduction of shear stress with increasing shear rate under direct current electric fields, for
an electrorheological fluid composed of sulfonated poly(styrene-co-divinylbenzene) particles dispersed in silicone oil. At all shear rates, the shear stress under the electric field is larger
than that in the absence of the field, indicating that there is still some field-induced agglomeration of the particles. In
contrast, the behavior under alternating current electric fields is the Bingham-fluid-type response commonly observed with
electrorheological fluids. It is suggested that the conventional dipole–dipole interaction approach based on simplified microstructural
models would be unable to explain these phenomena.
Received: 27 November 2000 Accepted: 22 May 2001 |
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| Keywords: | Electrorheological fluid Flow curve Electric current |
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