Features of dry spot evolution at the film flow of cryogenic liquids at non-stationary heat release
A.N. Pavlenko, I.P. Starodubtseva, and A.S. Surtaev
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 505–513
Abstract
Transitional processes with dry spot formation and drying crisis development were studied experimentally for the gradual and quasi-stationary laws of heat release on a thin-wall heater cooled by a falling film of cryogenic liquid. It is shown that for low densities of the heat flux, the laminar-wave liquid film decays with formation of a self-organizing system of metastable regular structures with boiling liquid jets and large dry zones between them. The numerical experiment modelling the process of repeated wetting of a superheated surface dried by impulse heat release was carried out. It was found for the first time that the local motion velocities of different zones of the 2D wetting front differ significantly. Reliability of results obtained by numerical methods was proved by direct comparison with experimental data.
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