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Research Papers: Multiphase Flows

Experiments and Models of the Magneto Rheological Behavior of High Weight Percent Suspensions of Carbonyl Iron Particles in Silicone Oil

[+] Author and Article Information
Farzad Ahmadkhanlou, Monon Mahboob, Stephen Bechtel, Gregory Washington

Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210

J. Fluids Eng 130(12), 121301 (Oct 24, 2008) (7 pages) doi:10.1115/1.2979001 History: Received September 06, 2007; Revised July 24, 2008; Published October 24, 2008

Flow properties of magnetorheological (MR) fluids are greatly altered by the application of a magnetic field. The design, optimization, and control of novel devices that exploit MR fluid behavior in multidegree of freedom applications require three dimensional models characterizing the coupling of magnetic behavior to mechanical behavior in MR fluids. The authors have derived 3D MR fluid models based on multiscale kinetic theory. The underlying bases of the models are summarized, with phenomenological empiricism distinguished from multiscale first principles, and the models’ ability to capture the experimentally measured mechanical response of a MR fluid-based damper to specified magnetic fields is assessed. The results of this comparison are that the kinetic theory-based models both relate macroscale MR fluid behavior to a first-principles description of magnetomechanical coupling at the microscale and possess the flexibility to best match the measured behavior of a particular MR fluid device observed in our experiments.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

2D force feedback device using a MR fluid (using MR fluid in the gap between steel ball and socket)

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Figure 2

Sections of the rectilinear foam-based damper

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Figure 3

(a) Hypothesized velocity profile of the MR fluid in the foam and gap; (b) effective simple shear flow

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Figure 4

Tensile testing machine test results for sinusoidal input

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Figure 5

Tensile test results for a sinusoidal input

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Figure 6

Experimental measurements tensile testing machine: shear stress as a function of shear rate and magnetic field strength

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Figure 7

The same experimental measurements as Fig. 6 but expressed as yield shear stress versus magnetic field

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