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Published on: May 2, 2014
High-speed videomicroscopy and magnetorheology under triaxial unsteady magnetic fields
O Martínez-Cano1, J R Morillas1, J Ruiz-Nievas1
1University of Granada, F2N2Lab, Magnetic Soft Matter Group and Excellence Research Unit 'Modeling Nature' (MNat), Department of Applied Physics, Faculty of Sciences, C/Fuentenueva s/n, 18071 - Granada, Spain.
Abstract:
We describe a custom-built device that is capable of superimposing triaxial unsteady magnetic fields on a sample at the same time that its microstructure is visualized using a high-speed camera and its rheological properties are measured with a commercial rheometer. The device reaches field strengths up to 5 kA·m^{-1}, frequencies up to 4 kHz, and its functionality is evaluated by testing magnetorheological fluids under steady shear flow and field transients. Striking differences are found at small Mason numbers by changing the field configuration.
