Magnetic fluid with a spherical ferromagnetic body in a uniform magnetic field. Theory and experiment

D. Pelevina² - V. Naletova² - V. Bashtovoi¹ - A. Motsar¹ - A. Reks¹

¹ UNESCO Chair, Belorussian National Technical University, 65 Nezavisimosti Ave., Minsk, 220013, Belarus
² Institute of Mechanics, Lomonosov Moscow State University, 1 Michurinskiy Pr., 119192, Moscow, Russia

Abstract
The shape of a magnetic fluid free surface containing a spherical body with a magnetizable material in an applied uniform magnetic field is studied experimentally and theoretically. It is shown that a distortion of the applied uniform magnetic field by the spherical body leads to a deformation of the magnetic fluid free surface. The dependences of the free surface height on the magnetic field strength for different thicknesses of the magnetic fluid layer in a vertical and in a horizontal applied magnetic field were obtained. Jump-like changes of the magnetic fluid surface at critical values of the applied magnetic field are observed. Tables 1, Figs 7, Refs 2.