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Particle-Scale Investigation of Thermal Radiation in Nuclear Packed Pebble Beds Wu, H, Gui, N, Yang, X, Tu, J and Jiang, S 2018, 'Particle-Scale Investigation of Thermal Radiation in Nuclear Packed Pebble Beds', Journal of Heat Transfer, vol. 140, no. 9, pp. 1-7. Document type: Journal Article Collection: Journal Articles Title Particle-Scale Investigation of Thermal Radiation in 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 9 Start page 1 End page 7 Total pages 7 Publisher American Society of Mechanical Engineers (ASME) Abstract For the heat transfer of pebble or granular beds (e.g., high temperature gas-cooled reactors (HTGR)), the particle thermal radiation is an important part. Using the subcell radiation model (SCM), which is a generic theoretical approach to predict effective thermal conductivity (ETC) of particle radiation, particle-scale investigation of the nuclear packed pebble beds filled with monosized or multicomponent pebbles is performed here. When the radial porosity distribution is considered, the ETC of the particle radiation decreases significantly at near-wall region. It is shown that radiation exchange factor increases with the surface emissivity. The results of the SCM under different surface emissivity are in good agreement with the existing correlations. The discrete heat transfer model in particle scale is presented, which combines discrete element method (DEM) and particle radiation model, and is validated by the transient experimental results. Compared with the discrete simulation results of polydisperse beds, it is found that the SCM with the effective particle diameter can be used to analyze behavior of the radiation in polydisperse beds. Subject Numerical Modelling and Mechanical Characterisation Keyword(s) emissivity particle radiation particle scale pebble bed polydisperse bed radial porosity DOI - identifier 10.1115/1.4039913 Copyright notice Copyright © 2018 by ASME ISSN 0022-1481 Related Links Link Description http://dx.doi.org/10.1115/1.4039913 Link to Published Version   Versions Version Filter Type Mon, 08 Jul 2019, 14:50:25 EST Filtered Full Citation counts:   Cited 2 times in Thomson Reuters Web of Science Article | Citations Cited 0 times in Scopus Article Altmetric details: Access Statistics: 10 Abstract Views  -  Detailed Statistics Created: Fri, 05 Jul 2019, 12:33:00 EST by Catalyst Administrator