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Structure and viscoelasticity of an electrorheological fluid in oscillatory shear: computer simulation investigation

Wang, Z., Lin, Z. F. and Tao, R. B. (1997) Structure and viscoelasticity of an electrorheological fluid in oscillatory shear: computer simulation investigation. Journal of Physics D: Applied Physics, 30 (8). pp. 1265-1271. ISSN 1361-6463

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To link to this item DOI: 10.1088/0022-3727/30/8/017

Abstract/Summary

The three-dimensional molecular dynamics simulation method has been used to study the dynamic responses of an electrorheological (ER) fluid in oscillatory shear. The structure and related viscoelastic behaviour of the fluid are found to be sensitive to the amplitude of the strain. With the increase of the strain amplitude, the structure formed by the particles changes from isolated columns to sheet-like structures which may be perpendicular or parallel to the oscillating direction. Along with the structure evolution, the field-induced moduli decrease significantly with an increase in strain amplitude. The viscoelastic behaviour of the structures obtained in the cases of different strain amplitudes was examined in the linear response regime and an evident structure dependence of the moduli was found. The reason for this lies in the anisotropy of the arrangement of the particles in these structures. Short-range interactions between the particles cannot be neglected in determining the viscoelastic behaviour of ER fluids at small strain amplitude, especially for parallel sheets. The simulation results were compared with available experimental data and good agreement was reached for most of them.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:38031
Publisher:IOP Publishing

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