Comprehensive flow and magnetization data obtained previously on the behavior of ferrofluid based magnetorheological fluids (FF-MRF) [Susan-Resiga and Vékás, Rheol. Acta 55(7), 581–595 (2016)] were correlated using a Mason number () defined for these nano-micro composite fluids and the corresponding Casson (Ca) number, instead of the Bingham number used for conventional magnetorheological (MR) fluids. Practically, agglomerate-free, high colloidal stability ferrofluids with Newtonian behavior in the absence of a magnetic field were used as carrier to keep the off-state viscosity as low as possible and to ensure the reproducibility of the MR response of the composite fluid. The apparent viscosities and magnetization values for samples with various nanosized magnetites and micrometer range iron particle volume fractions (from 2.75% to 22.90% and from 4% to 44%, respectively) at different values of magnetic induction and shear rate collapsed on a master curve by using the nondimensional and Ca numbers to correlate the measured data. By controlling the volume fraction both at nano- and microlevels, the magnetic and MR properties of the resulting composite fluids can be tailored to offer a high-performance lubricant for semiactive dampers and brakes, as well as for magnetofluidic rotating seals. The and Ca numbers offer a design metric based solely on the properties of FF-MRFs and can be reliably scaled to devices of different sizes and operating conditions.
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May 2017
Research Article|
May 01 2017
Ferrofluid based composite fluids: Magnetorheological properties correlated by Mason and Casson numbers
Daniela Susan-Resiga;
Daniela Susan-Resiga
a)
Laboratory of Magnetic Fluids-Center for Fundamental and Advanced Technical Research,
Romanian Academy-Timisoara Branch
, Timisoara, Romania
and Faculty of Physics, West University of Timisoara, Timisoara, Romania
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Ladislau Vékás
Ladislau Vékás
b)
Laboratory of Magnetic Fluids-Center for Fundamental and Advanced Technical Research,
Romanian Academy-Timisoara Branch
, Timisoara, Romania
and Research Center for Engineering Systems with Complex Fluids, University Politehnica Timisoara, Timisoara, Romania
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a)
Present address: Faculty of Physics, West University of Timisoara, Timisoara, Romania. Electronic mail: [email protected]
b)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 61, 401–408 (2017)
Article history
Received:
August 29 2016
Accepted:
February 13 2017
Citation
Daniela Susan-Resiga, Ladislau Vékás; Ferrofluid based composite fluids: Magnetorheological properties correlated by Mason and Casson numbers. J. Rheol. 1 May 2017; 61 (3): 401–408. https://doi.org/10.1122/1.4977713
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