https://doi.org/10.1140/epjst/e2013-01808-1
Regular Article
Influence of an electromagnetic field on the formation of wet metal foam
Institut für Strömungsmechanik, Technische Universität Dresden, 01069 Dresden, Germany
a e-mail: sascha.heitkam@tu-dresden.de
Received:
17
December
2012
Revised:
5
February
2013
Published online:
26
March
2013
This paper presents a method of floating bubbles in liquid metal by applying an electromagnetic field. The aim of this method is to distribute the bubbles more homogeneously and to stop drainage in the generation process of metal foam. A horizontal electric current, combined with an orthogonal, horizontal magnetic field creates an upward Lorentz force that counteracts gravitational acceleration. Phase-resolving numerical simulations have been applied in order to investigate the complex behavior of a large number of bubbles exposed to these fields. Controlled by the strength of the electromagnetic fields, the bubbles can ascend more slowly, stagnate, or even descend. Due to the influence of the bubbles on the electric current, however, rotating flows are induced which prevent the bubbles from becoming immobile and induce an interesting mixing structure. Consequently, the applied electromagnetic field offers the opportunity to manipulate the bubble distribution and the drainage in the generation process of wet metal foam.
© EDP Sciences, Springer-Verlag, 2013
