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research-article

Particle-scale investigation of thermal radiation in nuclear packed pebble beds

[+] Author and Article Information
Hao Wu

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing, 100084, China; School of Engineering, RMIT University, Melbourne, VIC 3083, Australia
wuhao1938@hotmail.com

Nan Gui

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing, 100084, China
guinan@mail.tsinghua.edu.cn

Xingtuan Yang

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing, 100084, China
yangxt@mail.tsinghua.edu.cn

Jiyuan Tu

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing, 100084, China; School of Engineering, RMIT University, Melbourne, VIC 3083, Australia
jiyuan.tu@rmit.edu.au

Shengyao Jiang

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University Beijing, China 100084 China
shengyaojiang@sina.com

1Corresponding author.

ASME doi:10.1115/1.4039913 History: Received November 15, 2017; Revised April 02, 2018

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 sub-cell 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 mono-sized or multi-component 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 analyse the behaviour of the radiation in polydisperse beds.

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