Magnetic Field, Heat Transfer and Rheological Analysis of a Magnetorheometer using Finite Element Method
Abstract
Magnetorheological (MR) fluids show changes in apparent viscosity under an applied magnetic field. As a result, dramatic and reversible changes in rheological properties occurred, which permits many electromechanical devices to have potential utility in the aerospace, automobile, medical, and another field. Therefore, there is a need to investigate the rheological properties and heat developed due to changes in the rheological properties of MR fluids under the uniform magnetic field. This work presents the numerical simulation of magnetostatic, laminar fluid flow, and thermal field distribution of a plate-plate magnetorheometer using the finite element method. We analyzed the magnetic field distribution and magnitude of the magnetic field along the radius of the plates. We obtained a better uniform magnetic field along the radius of the plate with enhanced the magnitude of the magnetic field at a particular applied current compared to the other existing design of the rheometer. The maximum magnetic flux density at 4A of coil current is 1.3T. Laminar flow simulation gives the shear stress at the applied magnetic field as a function of the shear rate. We obtained the maximum velocity of the magnetic particles at the outer radius between plates. The heat generated due to the electromagnetic coil and slippage heating between the plates (i.e., MR region) is 302.5K and 308.5K at 3A current after 40 minutes of working time of magnetorheometer. The maximum temperature generated due to the combined effect of the electromagnetic coil and slippage is about 318K after 40 minutes of working time of magnetorheometer, much below the operating temperature of MR fluids. Here we enhanced the magnetic field density profile and magnitude of magnetic flux density along the working radius of the plate and minimized the effects of resistive coil heating in the MR fluid region by the coil and location design.
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