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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