Radiative and Convective Heat Transfer in the Gas Cavity of VVER-1200 Melt Trap

• Published in: Atomic energy (New York, N.Y.) Vol. 125; no. 2; pp. 112 - 118
• Main Authors: Kamenskaya, D. D., Tarasov, O. V., Filippov, A. S., Valetov, D. K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-12-2018; Springer Nature B.V
• Subjects: Approximation; Boundaries; Computer applications; Convection; Convective heat transfer; Energy industry; Hadrons; Heat transfer; Heavy Ions; Mathematical models; Nuclear Chemistry; Nuclear Energy; Nuclear Physics; Nuclear power plants; Nuclear reactors; Optical density; Physics; Physics and Astronomy; Radiation; Thermal radiation
• ISSN: 1063-4258; 1573-8205
• DOI: 10.1007/s10512-018-0451-0

Heat transfer in the gas cavity of the melt trap for the VVER-1200 core is studied. A model problem is solved numerically in a configuration where the cavity boundaries are close to that obtained after the formation of the melt pool. Heat transfer by radiation is calculated by three methods: in the approximation of a transparent medium taking account of the angular coefficients of radiation emission of sections of the cavity boundaries, by the DTRM method suitable for calculating radiation transfer in a medium with arbitrary optical density, and by the diffusion method in the Rosseland approximation. It is shown that the dominant mechanism is thermal radiation; the contribution of convection of the gas is relatively small. The influence of the choice of computational method on heat transfer in a gas cavity with different absorption is evaluated.