The dynamic oscillatory response of electrorheological suspensions is investigated using a molecular dynamics‐like simulation method, where suspensions are modeled as hard, monodisperse, neutrally buoyant, dielectric spheres contained in a dielectric, Newtonian fluid between parallel‐plate electrodes. The response is described by frequency‐dependent moduli, which display a significant relaxation due to competition between hydrodynamic and electrostatic forces on spheres within thick clusters. For small amplitude deformation of monodisperse suspensions, the direct electrostatic contribution to the response obeys time‐electric field strength superposition analogous to time–temperature superposition in polymer rheology. The response for monodisperse suspensions is dominated by a single relaxation time, in contrast to the broad dispersions commonly observed. Possible explanations for this discrepancy are discussed.
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March 1993
Research Article|
March 01 1993
Simulation of the dynamic oscillatory response of electrorheological suspensions: Demonstration of a relaxation mechanism
D. J. Klingenberg
D. J. Klingenberg
Department of Chemical Engineering and Rheology Research Center, University of Wisconsin, Madison, Wisconsin 53706
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D. J. Klingenberg
Department of Chemical Engineering and Rheology Research Center, University of Wisconsin, Madison, Wisconsin 53706
J. Rheol. 37, 199–214 (1993)
Article history
Received:
June 01 1992
Accepted:
October 24 1992
Citation
D. J. Klingenberg; Simulation of the dynamic oscillatory response of electrorheological suspensions: Demonstration of a relaxation mechanism. J. Rheol. 1 March 1993; 37 (2): 199–214. https://doi.org/10.1122/1.550441
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