We presented the study of magnetic fluid viscosity using a capillary viscometer of our own design and the method of oscillating volume of magnetic fluid in a magnetic field. Samples were studied on various carrier liquids: kerosene and polyethylsiloxane, with a volume concentration of the solid phase φ from 19 to 2.5%. The developed installation based on a capillary viscometer allows viscosity measurements in the magnetic field strength range from 20 to 350 kA/m. Measurements based on system oscillations occur in the range from 150 to 900 kA/m. It was experimentally established that the results obtained using these methods are consistent with each other, which allows us to conclude that both methods provide an identical estimate of the viscosity of a magnetic fluid in a magnetic field.
Shel'deshova et al. (Wed,) studied this question.