Salient features of the flow of a magnetic liquid that pushes down an air cavity in an oncoming magnetic field are considered. The jet mechanism of liquid flow is detected and its experimental and theoretical explanations are suggested for the model of the instability of the free magnetic liquid surface in magnetic field perpendicular to it. For an approximate model of a weakly magnetic medium, the geometry of the free surface is described in the initial stage of cavity pushing down. Experimental data on the dependence of the volume of cavity being pushed down on the velocity of the descending magnetic field source are presented for magnetic liquids with different viscosities. A kinetic model of pushing down of the air cavity, according to which the jet mechanism is replaced by the pit one with increasing velocity of the descending magnet, is suggested.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 47–53, October, 2014.
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Boev, M.L., Polunin, V.M., Ryapolov, P.A. et al. Instability of the Flow of a Magnetic Liquid Pushing Down an Air Cavity. Russ Phys J 57, 1348–1355 (2015). https://doi.org/10.1007/s11182-015-0388-x
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DOI: https://doi.org/10.1007/s11182-015-0388-x