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Simulation and validation of the dynamics of liquid films evaporating on horizontal heater surfaces
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics.
2012 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 48, 486-494 p.Article in journal (Refereed) Published
Abstract [en]

In this study a non-linear governing equation based on lubrication theory is employed to model the thinning process of an evaporating liquid film and ultimately predict the critical thickness of the film rupture under impacts of various forces resulting from mass loss, surface tension, gravity, vapor recoil and thermo-capillary. It is found that the thinning process in the experiment is well reproduced by the simulation. The film rupture is caught by the simulation as well, but it underestimates the measured critical thickness at the film rupture. The reason may be that the water wettability of the heater surfaces is not taken into account in the model. Thus, the minimum free energy criterion is used to obtain a correlation which combines the contact angle (reflection of wettability) with the critical thickness from the simulation. The critical thicknesses predicted by the correlation have a good agreement with the experimental data (the maximum deviation is less than 10%).

Place, publisher, year, edition, pages
2012. Vol. 48, 486-494 p.
Keyword [en]
Liquid film, Evaporation, Rupture, Critical thickness
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-104106DOI: 10.1016/j.applthermaleng.2012.05.021ISI: 000309026500051ScopusID: 2-s2.0-84863494032OAI: diva2:563209
Swedish Research Council, VR-2005-5729

QC 20121029

Available from: 2012-10-29 Created: 2012-10-29 Last updated: 2012-10-29Bibliographically approved

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