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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

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.
Original languageUndefined
Pages (from-to)111-119
JournalEuropean Physical Journal: Special Topics
Volume219
Early online date19 Mar 2013
DOIs
Publication statusPublished - Mar 2013
Externally publishedYes

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