Effect of viscosity on thermocapillary breakdown of a falling liquid film
D.V. Zaitsev1, A.A. Semenov1, and O.A. Kabov1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia 2Tomsk Polytechnic University, Tomsk, Russia E-mail: zaitsev@itp.nsc.ru
Keywords: film breakdown, threshold heat flux, thermal capillarity, viscous liquids
Pages: 625–628
Abstract
Thermocapillary breakdown of a liquid film flowing due to gravity over a vertical plate with a heater of 150×150 mm is studied in a wide range of liquid properties (in particular, dynamic viscosity at the initial temperature varies from 0.91×10-3 to 16.9×10-3 Pa×s)
and film Reynolds number (Re = 0.15-53.5). It is found
that liquid viscosity has a significant effect on the threshold heat flux
corresponding to film breakdown. To take into account the effect of liquid
properties, the breakdown criterion traditionally used in literature was
modified. This allowed successful generalization of all data obtained.
DOI: 10.1134/S0869864316040168
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