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Heat Transfer Research
Fator do impacto: 1.199 FI de cinco anos: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v40.i1.20
pages 17-29

Liquid Decay and Metastable Regular Structures in the Falling Films at Nonstationary Heat Release

Aleksandr N. Pavlenko
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Anton S. Surtaev
Laboratory of Low Temperature Thermophysics Kutateladze Institute of Thermophysics Laboratory of Physical and Technical Fundamentals of Power Engineering Novosibirsk State University
A. N. Chernyavskii
S. S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Lavrent'ev Str., Novosibirsk, 630090, Russia
Oleg A. Volodin
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

RESUMO

This paper deals with investigation results on crisis phenomena for nonstationary heat release in falling liquid films. According to the new experimental results, in the studied range of irrigation degree alteration (Rein = 30−1660), parameters, characterizing decay of the falling liquid film with stepped heat release (distribution of time of boiling-up expectation along the liquid film, velocities of movable boundaries in the boiling-up and drying fronts, intensity of liquid ejection from the heat-releasing surface), complexly depend on the Reynolds number, wave characteristics and heat-flux density. It is shown that for low densities of the heat flux at crises under the conditions of stepwise loading, decay of a laminar-wave liquid film occurs with formation of metastable regular structures with liquid jets and large-scale dry zones between them. When loading thermal impulses of a high intensity, film decay is determined by dynamic characteristics of propagation of the self-maintained front of liquid boiling-up and the shape of structures, formed during its development.


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