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research-article

Modelling effective thermal conductivity (ETC) of thermal radiation for 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, ChinaSchool 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, ChinaSchool 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, 100084, China
shengyaojiang@sina.com

1Corresponding author.

ASME doi:10.1115/1.4038231 History: Received April 03, 2017; Revised August 22, 2017

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 sub-cell 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 sub-cell 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 radial heat transfer model is applied in the analysis of the HTTU experiments. The results of effective thermal conductivity and radial temperature distribution are in good agreement with the experimental data

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