Effect
of a static magnetic field on the ultrasonic propagation in magnetic
fluids
I. E. Ovchinnikov
Moscow State University of Instrument Engineering
and Computer Sciences
Received
January 15, 2013
Abstract: The propagation of
hydrodynamic waves of small amplitude in magnetic fluid was considered with
taking into account the process of relaxation of the magnetic field to its
equilibrium value. The expressions for phase velocities and absorption
coefficients were obtained for the fast magnetohydrodinamic wave and the Alfven
type wave under propagation in parallel to magnetic field. It was shown by the theoretical
analysis of the experimental data on the ultrasonic velocity in magnetic
nanofluids based on water and kerosene should: absorption coefficients of these
types of waves almost vanish by prolonged exposure of the homogeneous static
magnetic field.
Key words: magnetic fluid, magnetic
field, ultrasonics, nanoparticles, magnetite.