A dissipative process in ferrofluid in non-homogeneous magnetic field

Equations of motion of ferrofluid in non-homogenious magnetic field are derived, and it is shown that due to the orientational relaxation of suspesion particles, additional dissipative terms appear in this equations proportional to the velocity and the angular velocity of ferrofluid. Additional kinetic coefficients are found as functions of magnetic field and temperature by means of the approximate solution of rotational Fokker-Plank equation.