Experimental investigation of 3-dimensional wavy liquid films under the coupled influence of thermo-capillary and electrostatic forces |
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Authors: | Wilko Rohlfs Georg F Dietze Herman D Haustein Reinhold Kneer |
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Institution: | 11854. Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstrasse 18, 52064, Aachen, Germany 21854. DAAD Fellow at Laboratoire FAST — UMR CNRS 7608, Université Pierre et Marie Curie, 91405, Orsay, France
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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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