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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v39.i2.20
pages 101-124

Flow Dynamics, Crisis Phenomena and Decay of Falling Wavy Liquid Films during Boiling Incipience and Evaporation at Nonstationary Heat Release

Aleksandr N. Pavlenko
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia


Results of experimental studies and numerical simulation of flow dynamics, heat transfer, character of boiling-up, and crisis phenomena development are presented for falling wavy films of cryogenic liquid (nitrogen) and water under the intensive transient heat generation. Step-wise and periodic pulsing heat release was supplied on the vertical plane constantan foil of the 25 µm thickness and 40 mm length. When loading thermal impulses of a high intensity, nitrogen 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. The effect of heat flux density on the time of boiling-up expectation and structures of evaporation fronts is shown for different Reynolds numbers. According to new experimental data on decay dynamics of falling wavy films with transient heat generation for subcooled water, the crisis phenomena development is significantly effected by the condensation effect at boiling incipience.