Many-body dipole-induced dipole model for electrorheological fluids
Huang Ji-Ping (黄吉平)ab, Yu Kin-Wah (余建华)a
a Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China; b Laboratory of Computational Engineering, Helsinki University of Technology, PO Box 9203, FIN-02015 HUT, Finland
Abstract 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 each other due to many-body and multipolar interactions. Thus various works have 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 a correction.
Received: 16 July 2003
Revised: 24 December 2003
Accepted manuscript online:
PACS:
83.80.Gv
(Electro- and magnetorheological fluids)
Fund: Project supported by the Research Grants Council of the Hong Kong SAR Government under project nos CUHK 4245/01P and CUHK 403303.
Cite this article:
Huang Ji-Ping (黄吉平), Yu Kin-Wah (余建华) Many-body dipole-induced dipole model for electrorheological fluids 2004 Chinese Physics 13 1065
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