Bubble Formation on Porous Media Surfaces

  • R. Teppner
  • U. Schaflinger
Conference paper
Part of the CISM International Centre for Mechanical Sciences book series (CISM, volume 456)


In metal casting gas purging is used for impurity reduction. The impurities concentrate on the surface of the gas bubbles and are transported towards the slag by the ascending bubbles. Therefore, efficient flotation requires an optimal bubble volume, i.e. an optimal surface size.

In this context it is known that the bubble formation is strongly influenced by the non-wettability between the porous refractory and the melt. In our experiments we investigated the air bubble formation on aluminium and teflon surfaces in water. We studied the influence of non-wettability, surface inclination and surface roughness on the bubble shape and the bubble volume.


Inclination Angle Contact Line Bubble Formation Capillary Length Bubble Volume 
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  1. Kumar, R., Kuloor, N. (1970). The formation of bubbles and drops. Advances in Chemical Engineering 8:255–368.Google Scholar
  2. Teppner, R., and Schaflingert, U. (2000). Bubble formation on non-wetted porous media surfaces. In Proceedings of the Ninth International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, Aachen, Germany, 238–245.Google Scholar
  3. Wang, L., Lee, H., and Hayes, P., (1996). Prediction of the Optimum Bubble Size for Inclusion Removal from Molten Steel by Flotation. ISIJ International 36:7–16.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Wien 2002

Authors and Affiliations

  • R. Teppner
    • 1
  • U. Schaflinger
    • 1
  1. 1.Christian Doppler Laboratory for Continuous Solidification Processes, Institute of Fluid Mechanics and Heat TransferTechnical University GrazAustria

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