Abstract
Abstract We report here the first studies of the electrorheological (ER) effect in a liquid-liquid emulsion, which is composed of a silicone oil and a chlorinated paraffin oil, with a thousand-fold difference between the bulk conductivities of the two components. Transient response of the viscous shear stress exerted by the emulsion is examined following step changes (on or off) of an external DC electric field oriented perpendicular to the original flow direction. For emulsions with a volume fraction of silicone oil Φ within the range 0.10 ≤ Φ ≤ 0.90, the relative change in the shear stress is found to increase with the volume fraction of silicone oil at low values of imposed shear rate. Large differences exist between the relative ER response strengths of an emulsion with volume fraction Φ and the corresponding phase reversed system of volume fraction (1 − Φ).
Published Version
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