A heat transfer analysis of the CCI experiments 1-3

Tuomo Sevón

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

This paper presents an attempt to evaluate the heat transfer rates and gas release rates in the CCI core–concrete interaction experiments 1–3, performed within the OECD MCCI project. A new method for calculating the heat transfer rates has been developed. It is based on calculating integrals of the concrete enthalpies with the help of piecewise exponential interpolation curves. The new method takes into account heat conduction in the concrete. Compared to traditional methods, the new method gives better results during slow concrete ablation, and its time resolution is significantly better. The gas release rates from the concrete were also calculated. A regression analysis was conducted for the heat transfer coefficients and gas release rates. Three correlations for the bubbling-enhanced heat transfer were developed. For the basemat, a single correlation can be used for both siliceous and limestone/common sand (LCS) concrete types. For the sidewall, two different correlations are needed for the two concrete types. With the same superficial gas velocity, the heat transfer rate to siliceous sidewalls is higher than to LCS sidewalls. This suggests that the reason for the different radial ablation rates of the concrete types observed in the tests is not the lower gas content of siliceous concrete.
Original languageEnglish
Pages (from-to)2377 - 2386
Number of pages10
JournalNuclear Engineering and Design
Volume238
Issue number9
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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heat transfer
Concretes
Heat transfer
Gases
experiment
Experiments
gas
gases
Calcium Carbonate
ablation
limestone
Ablation
Limestone
sands
Sand
sand
OECD
analysis
rate
enthalpy

Cite this

Sevón, Tuomo. / A heat transfer analysis of the CCI experiments 1-3. In: Nuclear Engineering and Design. 2008 ; Vol. 238, No. 9. pp. 2377 - 2386.
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A heat transfer analysis of the CCI experiments 1-3. / Sevón, Tuomo.

In: Nuclear Engineering and Design, Vol. 238, No. 9, 2008, p. 2377 - 2386.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A heat transfer analysis of the CCI experiments 1-3

AU - Sevón, Tuomo

PY - 2008

Y1 - 2008

N2 - This paper presents an attempt to evaluate the heat transfer rates and gas release rates in the CCI core–concrete interaction experiments 1–3, performed within the OECD MCCI project. A new method for calculating the heat transfer rates has been developed. It is based on calculating integrals of the concrete enthalpies with the help of piecewise exponential interpolation curves. The new method takes into account heat conduction in the concrete. Compared to traditional methods, the new method gives better results during slow concrete ablation, and its time resolution is significantly better. The gas release rates from the concrete were also calculated. A regression analysis was conducted for the heat transfer coefficients and gas release rates. Three correlations for the bubbling-enhanced heat transfer were developed. For the basemat, a single correlation can be used for both siliceous and limestone/common sand (LCS) concrete types. For the sidewall, two different correlations are needed for the two concrete types. With the same superficial gas velocity, the heat transfer rate to siliceous sidewalls is higher than to LCS sidewalls. This suggests that the reason for the different radial ablation rates of the concrete types observed in the tests is not the lower gas content of siliceous concrete.

AB - This paper presents an attempt to evaluate the heat transfer rates and gas release rates in the CCI core–concrete interaction experiments 1–3, performed within the OECD MCCI project. A new method for calculating the heat transfer rates has been developed. It is based on calculating integrals of the concrete enthalpies with the help of piecewise exponential interpolation curves. The new method takes into account heat conduction in the concrete. Compared to traditional methods, the new method gives better results during slow concrete ablation, and its time resolution is significantly better. The gas release rates from the concrete were also calculated. A regression analysis was conducted for the heat transfer coefficients and gas release rates. Three correlations for the bubbling-enhanced heat transfer were developed. For the basemat, a single correlation can be used for both siliceous and limestone/common sand (LCS) concrete types. For the sidewall, two different correlations are needed for the two concrete types. With the same superficial gas velocity, the heat transfer rate to siliceous sidewalls is higher than to LCS sidewalls. This suggests that the reason for the different radial ablation rates of the concrete types observed in the tests is not the lower gas content of siliceous concrete.

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DO - 10.1016/j.nucengdes.2008.02.002

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