The European Physical Journal Special Topics

, Volume 219, Issue 1, pp 111–119 | Cite as

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

  • Wilko Rohlfs
  • Georg F. Dietze
  • Herman D. Haustein
  • Reinhold Kneer
Regular 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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Copyright information

© EDP Sciences and Springer 2013

Authors and Affiliations

  • Wilko Rohlfs
    • 1
  • Georg F. Dietze
    • 2
  • Herman D. Haustein
    • 1
  • Reinhold Kneer
    • 1
  1. 1.Institute of Heat and Mass TransferRWTH Aachen UniversityAachenGermany
  2. 2.DAAD Fellow at Laboratoire FAST — UMR CNRS 7608Université Pierre et Marie CurieOrsayFrance

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