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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL MODEL FOR QUENCHING OF HOT SURFACE BY THE FALLING CRYOGENIC LIQUID FILM

DOI: 10.1615/TFESC1.cmd.013191
pages 407-410

Irina Starodubtseva
Kutateladze Institute of Thermophysics Siberian Branch of the Russian Academy of Sciences 1, Academician Lavrentiev Ave., Novosibirsk 630090, Russia

Aleksandr N. Pavlenko
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1, Lavrentiev Ave., Novosibirsk 630090, Russia


KEY WORDS: Heat transfer, Numerical simulation, Quenching, Rewetting, Falling film flow

Abstract

Contact between a liquid and solid surface, whose initial temperature exceeds the maximum value for which a surface may be wet, is restored during quenching. Due to the complexity of the process, the mechanism of heat transfer during quenching is still not sufficiently understood. A numerical simulation is carried out to study the features of heat transfer and rewetting front dynamics during quenching of the vertical overheated surface by the falling cryogenic liquid film. It was found that the initialization of the rewetting front occurs after lowering the surface temperature to the temperature corresponding to the thermodynamic limit of a liquid superheat. The results revealed that the maximum heat flux into the liquid during quenching is significantly higher than those in quasi-stationary conditions. The dynamic pattern of the running fronts obtained numerically satisfactorily correlates with the pattern observed in the copper-nitrogen quenching experiments. The numerical model allows us to quantify the quench front velocity and temperature fields in the heater variable in space and time. Knowledge of the quench front velocity and the full time of transition process is required for solving the important problem of nuclear reactors safety.

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