ARTICLE:

• EXPERIMENTAL INVESTIGATIONS OF METASTABLE QUASI-REGULAR STRUCTURES IN HEATED WAVY LIQUID FILMS  download article

V. V. Lel'
Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Russia

A. Kellermann
Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany

G. Dietze
Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany

R. Kneer
Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany

A. N. Pavlenko
S. S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Lavrent'ev Str., Novosibirsk, 630090, Russia

ABSTRACT

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 of 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 with an according transformation on the basis of IR-thermography images to the film thickness field. The thermo-capillary nature of regular structures was proven experimentally.

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