Stabilization of a Molten-Metal/Coolant-Gas Interface by Electromagnetic Fields.

摘要

One of the critical issues affecting the cooling of a liquid-metal free surface with a high-velocity gas is the threshold gas velocity for wave formation. In electromagnetic levitation casting, the presence of high-frequency magnetic fields affects the onset and character of waves formed on the interface. A series of experiments was conducted in which nitrogen gas flowed at uniform velocity in a rectangular channel over the surface of a shallow horizontal dish containing liquid tin. The threshold gas velocity was determined when 10-kHz magnetic fields were applied to the surface. The magnetic fields were oriented both parallel and perpendicular to the gas flow. The threshold velocity increased as magnetic field strength increased. Substantial suppression of wave formation was observed with the magnetic field perpendicular to the gas flow, which contradicts previous theoretical predictions. 10 refs., 7 figs. (ERA citation 14:008029)