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Experimental investigation of 3-dimensional wavy liquid films under the coupled influence of thermo-capillary and electrostatic forces

The European Physical Journal Special Topics volume 219, pages 111–119 (2013)Cite this article

Abstract

Three-dimensional interfacial waves developing on the free surface of falling liquid films are known to intensify heat and mass transfer. In this context, the present paper studies the effect of electrostatic as well as of thermo-capillary forces on a falling film of a dielectric liquid. Therefore, measurements of the local film thickness using a confocal chromatic imaging method were performed under isothermal and heated conditions. The experimental results show that both forces destabilize the flow. It is found, that the application of an additional electric field under heating conditions enhances the generation of rivulets, thereby reducing the overall heat transfer coefficient.

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Authors and Affiliations

  1. Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstrasse 18, 52064, Aachen, Germany

    Wilko Rohlfs, Herman D. Haustein & Reinhold Kneer

  2. DAAD Fellow at Laboratoire FAST — UMR CNRS 7608, Université Pierre et Marie Curie, 91405, Orsay, France

    Georg F. Dietze

Authors
  1. Wilko Rohlfs
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  2. Georg F. Dietze
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  3. Herman D. Haustein
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  4. Reinhold Kneer
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Correspondence to Wilko Rohlfs.

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Rohlfs, W., Dietze, G.F., Haustein, H.D. et al. Experimental investigation of 3-dimensional wavy liquid films under the coupled influence of thermo-capillary and electrostatic forces. Eur. Phys. J. Spec. Top. 219, 111–119 (2013). https://doi.org/10.1140/epjst/e2013-01786-2

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  • DOI: https://doi.org/10.1140/epjst/e2013-01786-2

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