Abstract
Electrorheological fluid (ER fluid) is a kind of two-phase fluid. It shows rheological behavior when an electric field is applied to it. Although numerous theoretical and experimental studies have been conducted at many laboratories and institutions, there is still an unsettling controversy regarding the fundamental mechanism involved in the ER effect. In this investigation, first, the effects of electric fields, shear rates and concentrations of dispersed particles on shear stress acting in the fluid were studied. Then, under various strengths for applied electric fields, the velocity profiles of ER fluid between electrodes were measured with a laser Doppler velocimeter. These measurements show that the fluid flow is divided into three layers : an almost-solid-state layer, two-phase layer and pure-liquid layer.
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