Experimental Results on the Fluid Flow in an Electromagnetically Driven Metallic Melt

摘要

Electromagnetic processing of materials comprises the influence of Lorentz forces in the molten state. Whereas the action of static magnetic fields is solely damping in most cases, alternating fields offer the potentiality of active control mechanisms such as pumping, stirring, homogenization, and the like. Among the latter, various field types have to be distinguished based on the number of poles and geometric arrangement. Neither for one type, and more than ever for a combination thereof, might the resulting flow tagged well known. Numerous, often non-validated numerical simulations overwhelm the few experiments done on liquid metals. In the present work, the ultrasonic Doppler velocimetry and local potential probes have been employed to study the flow of a metallic melt in single-phase, traveling, and rotating magnetic fields. The area-wide results conveyed by the UDV technique will be presented as flow visualization whereas potential probe measurements may answer questions of a more quantitative nature and those regarding turbulence characteristics.