What is the molecular weight of MR fluid?
A. MR fluid is a mixture of iron, oil, and other proprietary additives and therefore does not have a molecular weight. See “Desity of MR fluid” above. Q. What determines the viscosity of MR fluid? A. The viscosity of an MR fluid depends on a number of factors, including viscosity of the liquid carrier, the volume fraction of particles, the amount and type of additives and the shear rate at which viscosity is measured. The additives in the fluid play a very big role in the viscosity at low shear rates, causing the viscosity to increase rapidly as one goes to lower shear rate. All MR fluids will display a shear thinning character. This means that their apparent viscosity will drop as shear rates are increased, until eventually a steady-state value is reached. For a hydrocarbon oil-based fluid, this steady state value is reached at a relatively low shear rate of perhaps a few hundred sec-1. For the water-based fluids, the apparent viscosity starts higher at low shear rate and continues to
