Torque Measurements in Spin-Up Flow of Ferrofluids

Adam D. Rosenthal; Carlos Rinaldi; Thomas Franklin; Markus Zahn

doi:10.1115/1.1669030

Journal of Fluids Engineering | Volume 126 | Issue 2 | TECHNICAL PAPERS

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TECHNICAL PAPERS

Torque Measurements in Spin-Up Flow of Ferrofluids

Adam D. Rosenthal, Carlos Rinaldi, Thomas Franklin and Markus Zahn

[+] Author and Article Information

Adam D. Rosenthal, Thomas Franklin, Markus Zahn

Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Laboratory for Electromagnetic and Electronic Systems, Cambridge, MA 02139

Carlos Rinaldi

Massachusetts Institute of Technology, Department of Chemical Engineering, Cambridge, MA 02139

J. Fluids Eng 126(2), 198-205 (May 03, 2004) (8 pages) doi:10.1115/1.1669030 History: Received January 17, 2003; Revised June 14, 2003; Online May 03, 2004

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Magnetization curves for water-based and Isopar-M ferrofluids obtained using a DMS Vibrating Sample Magnetometer at room temperature, T=299 K

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Linear region (low-field) of the magnetization curves obtained for water-based and Isopar-M ferrofluids at room temperature, T=299 K

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Torque required to restrain the ferrofluid-filled plastic spindle as a function of magnetic field amplitude at various frequencies for the (a) water-based and (b) Isopar-M ferrofluids in a clockwise rotating uniform magnetic field generated by a two-pole induction motor stator winding. Interpolating lines have been added to aid the reader in distinguishing trends in the data

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Re-plot of Fig. 3 torque data as a function of magnetic field frequency at various magnetic field amplitudes for (a) water-based and (b) Isopar-M ferrofluids

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Comparison between torque experimental measurements and predictions (solid lines) of (18) for the water-based ferrofluid (obtained using χ=0.65,η=7×10⁻³ Nsm⁻²,ζ=1.4×10⁻³ Nsm⁻²,τ=10⁻⁵ s, and κ=100). (a) Corresponds to clockwise rotation of the magnetic field and (b) corresponds to counterclockwise rotation of the magnetic field

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Comparison between torque experimental measurements and predictions (solid lines) of (18) for the Isopar-M ferrofluid (obtained using χ=2.2,η=11×10⁻³ Nsm⁻²,ζ=2.0×10⁻³ Nsm⁻²,τ=2×10⁻⁶ s, and κ=100). (a) Corresponds to clockwise rotation of the magnetic field and (b) corresponds to counterclockwise rotation of the magnetic field.

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Rosenthal AD, Rinaldi C, Franklin T, Zahn M. Torque Measurements in Spin-Up Flow of Ferrofluids. ASME. J. Fluids Eng. 2004;126(2):198-205. doi:10.1115/1.1669030.

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Torque Measurements in Spin-Up Flow of Ferrofluids

References

Figures

Magnetization curves for water-based and Isopar-M ferrofluids obtained using a DMS Vibrating Sample Magnetometer at room temperature, T=299 K

Linear region (low-field) of the magnetization curves obtained for water-based and Isopar-M ferrofluids at room temperature, T=299 K

Re-plot of Fig. 3 torque data as a function of magnetic field frequency at various magnetic field amplitudes for (a) water-based and (b) Isopar-M ferrofluids

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