Crisis phenomena in falling liquid films at periodic heat loads
A.S. Surtaev1, A.N. Pavlenko2
1 Kutateladze Institute of Thermophysics SB RAS 2 Kutateladze Institute of Thermophysics SB RAS
Keywords: heat transfer crisis, film flow, liquid nitrogen, alternating pulse heat release, regular metastable structures
Pages: 485-496
Abstract
Experimental results on development of crisis phenomena in a falling film of cryogenic liquid at alternating pulse heat release are presented. Experimental data on local temperature evolution along a heat releasing surface are obtained. It is shown that amplitude of heater temperature pulsations depends significantly on the heat flux density and coordinates along the liquid film flow. New experimental data on the critical heat fluxes corresponding to formation of stable dry spots and drying crisis are presented depending on duration of heat release pulses. It is shown that parameters of the forming metastable regular structures and critical drying parameters of the heat-releasing surface are determined by dynamics of the movable boundaries of wetting during self-organization of a system.
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