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Bubble Formation on Porous Media Surfaces

  • Conference paper
Drop-Surface Interactions

Part of the book series: CISM International Centre for Mechanical Sciences ((CISM,volume 456))

Abstract

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.

The members of the Institute of Fluid Mechanics and Heat Transfer mourn for Prof. Uwe Schaflinger who died on April 27, 2000.

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References

  • Kumar, R., Kuloor, N. (1970). The formation of bubbles and drops. Advances in Chemical Engineering 8:255–368.

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  • 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.

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  • 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.

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Author information

Authors and Affiliations

  1. Christian Doppler Laboratory for Continuous Solidification Processes, Institute of Fluid Mechanics and Heat Transfer, Technical University Graz, Austria

    R. Teppner & U. Schaflinger

Authors
  1. R. Teppner
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  2. U. Schaflinger
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Editor information

Editors and Affiliations

  1. German Aerospace Center, Germany

    Martin Rein

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© 2002 Springer-Verlag Wien

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Teppner, R., Schaflinger, U. (2002). Bubble Formation on Porous Media Surfaces. In: Rein, M. (eds) Drop-Surface Interactions. CISM International Centre for Mechanical Sciences, vol 456. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2594-6_12

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  • DOI: https://doi.org/10.1007/978-3-7091-2594-6_12

  • Publisher Name: Springer, Vienna

  • Print ISBN: 978-3-211-83692-7

  • Online ISBN: 978-3-7091-2594-6

  • eBook Packages: Springer Book Archive

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