Non-dimensional modeling and experimental evaluation of a MR squeeze mode rheometer

Squeeze mode flow in MR fluids has recently become an interest to many researchers. In squeeze mode, MR fluids can generate a wide range of force associated with a small displacement. The generated force is controllable by means of a variable magnetic field. This is promising for applications that require variable forces along short strokes. There are not many published data on the behavior of MR fluids in squeeze mode. Many of the basic properties of MR fluids in squeeze mode are still unknown. The presented research here focuses on modeling and testing MR fluids in squeeze mode. A novel squeeze mode rheometer was designed and built. The results show that MR fluid can deliver a force that is comparable in magnitude to the force in shear mode. A non-dimensional mathematical model was developed and validated experimentally.