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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v2.i6.50
pages 535-547

A COMPUTATIONAL MODEL FOR THERMAL RADIATION FROM THE ZONE OF MELT-WATER INTERACTION

Leonid A. Dombrovsky
Joint Institute for High Temperatures, 17A Krasnokazarmennaya Str., Moscow, 111116, Russia; Tyumen State University, 6 Volodarsky Str., Tyumen, 625003, Russia
National Committee of Heat and Mass Transfer (NCHMT)
M. V. Davydov
Electrogorsk Research & Engineering Center on NPP Safety, Saint Constantine 6,142530, Electrogorsk, Moscow region, Russia

ABSTRAKT

This article is concerned with numerical modeling of thermal radiation from the zone of interaction of a melt jet with a water pool. This particular problem is a part of the analysis of complex interaction of the core melt with water in the case of a hypothetical severe accident in light-water nuclear reactors. The energetic contribution of thermal radiation has been studied in some detail in recent articles by the authors. In the present article, we focus on a solution related to possible optical diagnostics of the physical parameters of the process. These diagnostics can be based on comparison of the measured and calculated thermal radiation in the small-scale laboratory experiments. The sensitivity of the numerical data to some important parameters of the computational model is expected to be important to validate and improve the multiphase flow model. The radiation transfer model employed is based on the transport approximation. The numerical procedure includes ray-tracing calculations in the range of water semitransparency with a source function determined using the large-cell radiation model. It is shown that the visible radiation of the interaction zone contains important information on the process parameters, and these parameters might be identified on the basis of the developed computational procedure for the direct problem.