The Effect of Interphase Friction on the Two-Phase Mixture Outflowing Characteristics into a High Density Medium

About the authors:

Maksim V. Alekseev, Cand. Sci. (Phys-Math.), Senior Research Associate, Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk); alekseev@itp.nsc.ru

Ivan S. Vozhakov, Cand. Sci. (Phys.-Math.), Senior Researcher, Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk); vozhakov@gmail.com

Sergey I. Lezhnin, Doctor of  Phys. and Mathematical Sciences, Chief Researcher, Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk); lezhnin@itp.nsc.ru

Nikolay A. Pribaturin, Doctor of Technical Sciences, Chief Researcher, Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk); pribaturin@itp.nsc.ru

Abstract:

Numerical modeling of dispersed two-phase mixture outflowing into a high density medium with the droplets of different sizes has been done. The results of the numerical simulation and the quasi-stationary asymptotic simplified model have been compared. The paper presents the characteristic parameters of the calculation: the evolution of both the gas cavity size and cavity pressure, the pressure and void fraction distribution in the computational domain as well. It was found that the interface slipping effect significantly affects the dynamics and the characteristics of coolant steady-state outflow. It is shown that the growth rate of the gas cavity, obtained by the simplified model, is higher than in the numerical simulation one. Minimal growth rate has been obtained with a gas cavity of small droplet size 5-10 m, virtually in the absence of slipping. The results of numerical calculations for two-velocity model and the results obtained using the asymptotic quasi-stationary model, have a satisfactory agreement at large times. The difference between the approximate and exact calculation is reduced, when the vessel pressure is increased.

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