Investigations of the Marangoni effect on the regular structures in heated wavy liquid films

Formation and development of quasi-regular metastable structures within laminar-wavy falling films were studied. These structures emerge within the residual layer between large waves and could be one reason for the break up of the falling film. The temperature field of the film surface was visualise...

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Bibliographic Details
Published in:Experiments in fluids 2008-02, Vol.44 (2), p.341-354
Main Authors: Lel, V. V., Kellermann, A., Dietze, G., Kneer, R., Pavlenko, A. N.
Format: Article
Language:English
Subjects:
Confocal
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Falling
Film thickness
Fluid dynamics
Fluid flow
Fluid- and Aerodynamics
Heat and Mass Transfer
Infrared radiation
Liquid films
Marangoni effect
Research Article
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Summary:Formation and development of quasi-regular metastable structures within laminar-wavy falling films were studied. These structures emerge within the residual layer between large waves and could be one reason for the break up of the falling film. The temperature field of the film surface was visualised using IR-thermography. The film thickness was obtained from point measurements with the chromatic confocal imaging method and converted into a film thickness field, based on a quasi-steady assumption and IR thermography images. The thermo-capillary nature (Marangoni effect) of the regular structures was proven experimentally.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-007-0408-x