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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v39.i2.30
pages 125-135

Flow Dynamics, Heat Transfer and Crisis Phenomena in the Films of Binary Freon Mixtures, Falling over the Structured Surface

Nikolay Pecherkin
Aleksandr N. Pavlenko
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Oleg A. Volodin
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia


This paper presents the experimental results on heat transfer and hydrodynamics of the falling films of binary mixtures on the surfaces with complex geometry. The vertical aluminum tubes of the 50 mm diameter with smooth and textured surfaces were used as the test sections. The binary Freon mixture R21/R114 of different compositions was used as the working fluid. The range of the film Reynolds number alteration was 70 to 700. The wave surface evolution of the falling liquid film and the process of dry spot formation were recorded by the high-speed digital video camera. Results of investigation of the wave surface structure, measurements of heat transfer coefficients and dynamics of dry spot formation on the heated surface with corresponding critical heat fluxes are shown in this paper.

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