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Thermal radiation modeling in numerical simulation of melt-coolant interaction
Joint Institute for High Temperatures, Moscow, Russia.
Electrogorsk Research & Engineering Center on NPP Safety, Saint Constantine 6,142530, Electrogorsk, Moscow region, Russia.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2008 (English)In: Proc. Int. Symp. Adv. Comput. Heat Transfer (CHT-08), 2008Conference paper (Refereed)
Abstract [en]

This paper is concerned with radiation heat transfer modeling in multiphase disperse systems, which are formed in high-temperature melt-coolant interactions. This problem is important for complex interaction of the core melt with water in the case of a hypothetical severe accident in light-water nuclear reactors. The nonlocal effects of thermal radiation due to the semitransparency of water in the visible and near-infrared spectral ranges are taken into account by use of the recently developed large-cell radiation model (LCRM) based on the spectral radiation energy balance for single computational cells. In contrast to the local approach for radiative heating of water by particles (OMM—opaque medium model), the LCRM includes radiative heat transfer between the particles of different temperatures. The regular integrated code VAPEX-P, intended to model the premixing stage of FCI, was employed for verification of the LCRM in a realistic range of the problem parameters. A comparison with the OMM and the more accurate P1 approximation showed that the LCRM can be recommended for the engineering problem under consideration. The effects of the temperature difference in solidifying particles are analyzed by use of the recently suggested approximation of transient temperature profile in the particles. It is shown that the effect of the temperature difference on heat transfer from corium particles to ambient water is considerable and should not be ignored in the calculations. An advanced computational model based on the LCRM for the radiation source function and subsequent integration of radiative transfer equation along the rays is also discussed.

Place, publisher, year, edition, pages
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Energy Engineering
URN: urn:nbn:se:kth:diva-53796DOI: 10.1615/ICHMT.2008.CHT.500OAI: diva2:470981
Int. Symp. Adv. Comput. Heat Transfer. (CHT-08), Marrakech, Morocco, May 11–16, 2008

QC 20120111

Available from: 2011-12-30 Created: 2011-12-30 Last updated: 2016-05-18Bibliographically approved

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