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A Rheological Model for Magneto-rheological Fluids

Department of Physics, West University of Timioara, Bvd. Vasile Pârvan, No. 4, Timioara 300223, Romania, dana_resiga{at}yahoo.com

The article presents a rheological model for magnetorheological fluids (MRF) by blending a quasi-newtonian behavior at very low shear stress with a Herschel—Bulkley model for large shear stress value where the suspension displays a shear-thinning behavior. The model parameters allow the identification of a yield point on the flow curve, where the shear stress reaches a local maximum for large magnetic field intensity. It is shown that our model accurately fits the experimental data over a wide range of shear rate and coil electric current intensity values. A main advantage of our model is that it can be used in regular CFD codes to compute the MRF flow in practical applications. We present such a numerical example, and validate the numerical results against a quasi-analytical solution.

Key Words: magnetorheological fluid • rheological model • continuous flow curve.

This version was published on May 1, 2009

Journal of Intelligent Material Systems and Structures, Vol. 20, No. 8, 1001-1010 (2009)
DOI: 10.1177/1045389X08100979


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