Abstract

A novel analytical investigation of magneto-rheological (MR) fluids in squeezingflows is performed and the results are validated with experimental test data. Thesqueeze flow of MR fluids has recently been of great interest to researchers. Thisis due to the large force capacity of MR fluids in squeeze mode compared toother modes (valve and shear modes), which makes the squeeze mode appropriatefor a wide variety of applications such as impact dampers and engine mounts.Tested MR fluids were capable of providing a large range of controllable forcealong a short stroke in squeeze mode. A mathematical model was developed usingperturbation techniques to predict closed-form solutions for velocity field, shear ratedistribution, pressure distribution and squeeze force. Therefore, the obtained solutionsgreatly help with the design process of intelligent devices that use MR fluids insqueeze mode. The mathematical model also reduces the need for complicatedand computationally expensive numerical simulations. The analytical results arevalidated by performing experimental tests on a novel MR device called an ‘MRpouch’ in an MR squeeze mode rheometer, both designed and built at CVeSS.

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