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TECHNICAL PAPERS

Estimation of Equivalent Permeability in Magnetorheological Fluid Considering Cluster Formation of Particles

[+] Author and Article Information
Toshihiko Shiraishi

Graduate School of Engineering, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan e-mail: shira@neuman.jks.ynu.ac.jp

Shin Morishita

Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japane-mail: mshin@ynu.ac.jp

Henri P. Gavin

Department of Civil and Environmental Engineering, Duke University, Box 90287, Durham, NC 27708-0287e-mail: hpgavin@duke.edu

J. Appl. Mech 71(2), 201-207 (May 05, 2004) (7 pages) doi:10.1115/1.1667530 History: Received October 09, 2002; Revised July 21, 2003; Online May 05, 2004
Copyright © 2004 by ASME
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References

Figures

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Microscopic photograph of an MR fluid; (a) without a magnetic field (B=0 T), (b) with a magnetic field (B=1×10−2 T), (c) with a magnetic field (B=8×10−2 T)
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Typical characteristics of MR fluids
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Simulation area and state variables
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Decomposition of velocity vi
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Calculation of velocity of particles considering contact force
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Direction of a moving particle
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Simulation results of cluster formation; (a) t=0 s, (b) t=1×10−3 s, (c) t=1×10−2 s, (d) t=2×10−1 s
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Schematic view of the viscometer
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Meshing in the viscometer; (a) around the gap, (b) around the MR fluid in the gap
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Magnetic flux lines around the gap in the viscometer; (a) t=0 s, (b) t=2×10−1 s
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Magnetic field strength and flux density in the gap area at t=0 s; (a) Hx, (b) Bx, (c) Hy, (d) By
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Magnetic field strength and flux density in the gap area at t=2×10−1 s; (a) Hx, (b) Bx, (c) Hy, (d) By
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Magnetic flux lines around the MR fluid in the gap; (a) t=0 s, (b) t=1×10−3 s, (c) t=1×10−2 s, (d) t=2×10−1 s
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Time evolution of average of magnetic field strength and flux density in the gap area; (a) Hx, (b) Bx, (c) Hy, (d) By
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Time evolution of specific permeability in the MR fluid
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B-H curve considering the cluster structure

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