TY - JOUR
T1 - Experimental investigation of 3-dimensional wavy liquid films under the coupled influence of thermo-capillary and electrostatic forces
AU - Rohlfs, Wilko
AU - Dietze, Georg F.
AU - Haustein, Herman D.
AU - Kneer, Reinhold
PY - 2013/3
Y1 - 2013/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84874965133&partnerID=MN8TOARS
U2 - 10.1140/epjst/e2013-01786-2
DO - 10.1140/epjst/e2013-01786-2
M3 - Article
SN - 1951-6355
VL - 219
SP - 111
EP - 119
JO - The European physical journal. Special topics
JF - The European physical journal. Special topics
ER -