Modeling of critical filtration regimes of vapor-liquid flow

• Published in: Journal of physics. Conference series 2020-11, Vol.1677 (1), p.12062
• Main Authors: Khramtsov, D P, Nekrasov, D A, Vyazmin, A V, Pokusaev, B G
• Format: Article
• Language: English
• Subjects: Atmospheric models; Computational fluid dynamics; Cooling systems; Critical flow; Critical mass; Liquid flow; Mass flow rate; Mathematical models; Model testing; Numerical methods; Parameters; Physics; Pressure drop; Pressure reduction; Stationary processes; Two phase flow; Vaporization; Vapors
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1677/1/012062

Critical flows are widely used in power engineering. Such flows are characterized by non-stationary processes, active vaporization due to a sharp drop in pressure when the mixture flows from a high-pressure medium to an atmospheric pressure medium, which especially necessitates the study of the parameters of such flows in emergency situations, such as an emergency depressurization of a pipeline or cooling system. Due to the presence of two phases and the transiency of the processes, it is necessary to develop methods for numerical simulation of this process. The energy apparatus with a granular layer adds an additional level of complexity to the study of critical flows, namely, the effect of granular backfill on the characteristics of a two-phase flow. A new model for numerical simulation of the critical outflow of a vapor-liquid flow from a channel with a granular backfill has been created. The values of the mass flow rate of the mixture, the effect of vapor content on the critical flow rate, and the effect of geometric parameters of the granular backfill on the critical mass flow rate are obtained. The calculated data were compared with the experiment, and new data were obtained in a wider range of mass vapor content compared to experimental study.