Piston rheometer tests magnetorheological fluids

Piston rheometer tests magnetorheological fluids

The piston slit-flow rheometer enables long-term testing of the behaviour of magnetorheological (MR) fluids in the real operational conditions of damping equipment, including data analysis for use in durability testing.

Moreover, the new rheometer meets the requirements for easy installation to any mechanical or hydraulic pulsator. It achieves high shear speeds, precisely measures fluid temperatures, is easy to disassemble and decontaminate, and has low purchase and operational costs.

No commercially available rheometer can be used for monitoring the degradation of MR fluids under long-term loading. The reason is that rheometers cannot monitor the behaviour of magnetorheological fluids in conditions which correspond to operational conditions, i.e. at high shear gradients and variable temperatures. Even a piston flow-rheometer does not meet the requirement for long-term loading. The advantage of the new solution is the rheometer’s construction, which enables long-term uninterrupted measuring, thus enabling the durability of magnetorheological fluids to be tested.

The basic component of magnetorheological hydraulic dampers is a special fluid. The fluid is called magnetorheological fluid and consists of three basic components: carrier fluid, ferromagnetic particles and additives. As the carrier fluid can be used water, oil or some other liquid. The basic source for evaluating the behaviour of magnetorheological fluids are flow and viscosity curves.

The originators of this invention (patent and utility model) are: Doc. Ing. Ivan Mazůrek, CSc. and Ing. Jakub Roupec, Ph.D. of the Institute of Machine and Industrial Design – Department of Machine Design.

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