Modeling effective thermal conductivity of thermal radiation for nuclear packed pebble beds

Wu, H, Gui, N, Yang, X, Tu, J and Jiang, S 2018, 'Modeling effective thermal conductivity of thermal radiation for nuclear packed pebble beds', Journal of Heat Transfer, vol. 140, no. 4, pp. 1-6.


Document type: Journal Article
Collection: Journal Articles

Title Modeling effective thermal conductivity of thermal radiation for nuclear packed pebble beds
Author(s) Wu, H
Gui, N
Yang, X
Tu, J
Jiang, S
Year 2018
Journal name Journal of Heat Transfer
Volume number 140
Issue number 4
Start page 1
End page 6
Total pages 6
Publisher American Society of Mechanical Engineers
Abstract In nuclear packed pebble beds, it is a fundamental task to model effective thermal conductivity (ETC) of thermal radiation. Based on the effective heat transfer cells of structured packing, a short-range radiation model (SRM) and a subcell radiation model (SCM) are applied to obtain analytical results of ETC. It is shown that the SRM of present effective heat transfer cells are in good agreement with the numerical simulations of random packing and it is only slightly higher than empirical correlations when temperature exceeds 1200 °C. In order to develop a generic theoretical approach of modeling ETC, the subcell radiation model is presented and in good agreement with Kunii-Smith correlation, especially at very high temperature ranges (over 1500 °C). Based on SCM, one-dimensional (1D) radial heat transfer model is applied in the analysis of the HTTU experiments. The results of ETC and radial temperature distribution are in good agreement with the experimental data.
Subject Chemical Engineering not elsewhere classified
Mechanical Engineering not elsewhere classified
Interdisciplinary Engineering not elsewhere classified
Keyword(s) packed particle
pebble bed
effective thermal conductivity
thermal radiation
subcell radiation
Voronoi tessellation
DOI - identifier 10.1115/1.4038231
Copyright notice Copyright © 2018 by ASME
ISSN 0022-1481
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