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Permalloy inductor based instrument that measures the sedimentation constant of magnetorheological fluids

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2 Author(s)
Chen, L.S. ; Department of Instrumentation Engineering, Shanghai Jiaotong University, Shanghai 200030, China ; Chen, D.Y.

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An instrument, which incorporates a permalloy inductor, an acid buret, a z-axis translating stage, and a multifunctional inductance meter, has been designed and built to measure the sedimentation constant of magnetorheological (MR) fluids. The permalloy inductor is able to sense the tiny settling distance and thus eliminates measurement dependence on the centrifuge. Usage of the device is described and performance of the instrument is validated by measurement on a MRF-132LD MR fluid with a sedimentation constant of about 4.7×10-10s obtained within 5 h. © 2003 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:74 ,  Issue: 7 )