Measurements of magnetic-field-induced torque in applied uniform rotating magnetic fields are presented and compared to theoretical analyses for water- and oil-based ferrofluids. These experiments measure the viscous torque on the inner wall of a stationary hollow polycarbonate spindle that is completely filled with ferrofluid and attached to a viscometer functioning as a torque meter. The spindle remains stationary and is centered inside a three-phase AC 2-pole motor stator winding, creating uniform time-varying rotating magnetic fields. The viscous torque is measured as a function of magnetic field amplitude, frequency, and direction of rotation. These measurements demonstrate that ferrofluid flow and torque are present even in the absence of free surfaces and agree with a recently derived analysis of the torque during spin-up flow of ferrofluids.
Torque Measurements in Spin-Up Flow of Ferrofluids
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division January 17, 2003; revised manuscript received June 14, 2003. Associate Editor: D. Siginer
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Rosenthal, A. D., Rinaldi, C., Franklin , T., and Zahn, M. (May 3, 2004). "Torque Measurements in Spin-Up Flow of Ferrofluids ." ASME. J. Fluids Eng. March 2004; 126(2): 198–205. https://doi.org/10.1115/1.1669030
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