Many-body dipole-induced dipole model for electrorheological fluids

Details Many-body dipole-induced dipole model for electrorheological fluids Many-body dipole-induced dipole model for electrorheological fluids

2002-09-21

arxiv.org/abs/cond-mat/0209505v1

Chinese Phys. 13, 1065 (2004)

Physics

Condensed Matter

Soft Condensed Matter

RevTeX, 3 eps figures

Scientific paper

10.1088/1009-1963/13/7/017

Theoretical investigations on electrorheological (ER) fluids usually rely on computer simulations. An initial approach for these studies would be the point-dipole (PD) approximation, which is known to err considerably when the particles approach and finally touch due to many-body and multipolar interactions. Thus various work attempted to go beyond the PD model. Being beyond the PD model, previous attempts have been restricted to either local-field effects only or multipolar effects only, but not both. For instance, we recently proposed a dipole-induced-dipole (DID) model which is shown to be both more accurate than the PD model and easy to use. This work is necessary because the many-body (local-field) effect is included to put forth the many-body DID model. The results show that the multipolar interactions can indeed be dominant over the dipole interaction, while the local-field effect may yield an important correction.

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