Magnetohydrodynamic instability of the surface metal layer melted by pulsed current
Samuilov S D.
1, Shcherbakov I. P.
1, Bocharov Y.N.
2, Krivosheev S. I.
2, Magazinov S. G.
21Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
Email: sam.mhd@mail.ioffe.ru, Unbocharov@yandex.ru, ksi.mgd@spbstu.ru, magazinov_sg@mail.ru
It is shown that the results of dispersion of various materials in the mode of pulsed current action correspond to theoretical estimates of the wavelength of MHD instability. The sizes of the obtained metal grain, including refractory ones, correspond to the modes of exposure, and their microstructure corresponds to the conditions of formation. Modeling in the Comsol Multiphysics environment at a qualitative level revealed the influence of the thickness of the surface layer of the current flow on the dynamics of the formation and separation of liquid metal droplets. It is shown that one of the operating factors that create and increase instabilities is the heterogeneity of the distribution of Lorentz forces in the current supply zone. Keywords: electric explosion, surface effect, grain (micro-ingots), numerical simulation.
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