Journal of Engineering Physics and Thermophysics
is a translation of Inzhenerno-fizicheskii Zhurnal,
a publication of the Academic Scientific Complex
"A. V. Luikov Heat and Mass Transfer Institute"
of the National Academy of Sciences of Belarus
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THE EFFECT OF THE SURFACE STATE OF PARTICLES ON PAIR
INTERACTION IN A MAGNETIC SUSPENSION
B. E. Kashevskii and V. A. Kuz'min
UDC 532.582.7:538.6
The dynamics of a pair of spherical magnetically soft particles
suspended in a fluid under the action of a rotating field is
studied experimentally and theoretically. Hydrodynamic
interaction of the particles and repulsion in the surface layer
are taken into consideration in the theory and the magnetic
field is described in a dipole-dipole approximation. Experiments
confirm the important role of surface roughness, which limits
the increase in viscous friction between the particles that are
coming closer together. The effect of roughness-induced
stochastization of the dynamics of the pair is found in the
frequency range near the cutoff frequency of rotation synchronous
with the field.
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