中国物理B ›› 2004, Vol. 13 ›› Issue (7): 1065-1069.doi: 10.1088/1009-1963/13/7/017

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Many-body dipole-induced dipole model for electrorheological fluids

余建华1, 黄吉平2   

  1. (1)Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China; (2)Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China; Laboratory of Computational Engineering, Helsinki University of Technology, PO Box 9203, FIN-02015 HUT, Finland
  • 收稿日期:2003-07-16 修回日期:2003-12-24 出版日期:2004-07-05 发布日期:2005-07-05
  • 基金资助:
    Project supported by the Research Grants Council of the Hong Kong SAR Government under project nos CUHK 4245/01P and CUHK 403303.

Many-body dipole-induced dipole model for electrorheological fluids

Huang Ji-Ping (黄吉平)ab, Yu Kin-Wah (余建华)a   

  1. 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
  • Received:2003-07-16 Revised:2003-12-24 Online:2004-07-05 Published:2005-07-05
  • Supported by:
    Project supported by the Research Grants Council of the Hong Kong SAR Government under project nos CUHK 4245/01P and CUHK 403303.

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摘要： 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.

关键词: electrorheological fluid, many-body (local-field) effect, multipolar interaction

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.

Key words: electrorheological fluid, many-body (local-field) effect, multipolar interaction

中图分类号:  (Electro- and magnetorheological fluids)

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