Abstract
In the heat transportation of core of high temperature gas-cooled nuclear reactor (HTGR), radiative heat transfer plays a significant role in the CFD-DEM simulations. The numerical investigation is conducted for parameter analysis and wall effect of the thermal radiation. A cell model is presented to discuss the effects of temperature and pebble size. The radiation effective conductivity is directly proportional to pebble diameter and cube of the temperature. For engineering cases, the emissivity on radiation is linear approximately. In the bulk region without wall effect, the radiative thermal conductivity is inversely proportional to the packing density. The effect of solid conductivity and gas absorption can be neglected for common gases with forced convection. With uniform continuum model and discrete particle simulation, the radiative conductivity is inversely proportional to the pebble sphericity and directly proportional to the integral of the radial distribution and radiation interaction function. And radiation characteristics in wall and near-wall region are different from that of bulk region.
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05 February 2022
A Correction to this paper has been published: https://doi.org/10.1007/s42757-022-0132-z
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Acknowledgements
The authors are grateful for the support of this research by the China Postdoctoral Science Foundation (Grant No. 2018M640141) and the National Natural Science Foundations of China (Grant Nos. 51406100 and 51576211), the Science Fund for Creative Research Groups of National Natural Science Foundation of China (Grant No. 51321002), the National High-tech R&D Program of China (863 Program, Grant No. 2014AA052701).
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Wu, H., Gui, N., Yang, X. et al. Parameter analysis and wall effect of radiative heat transfer for CFD-DEM simulation in nuclear packed pebble bed. Exp. Comput. Multiph. Flow 3, 250–257 (2021). https://doi.org/10.1007/s42757-020-0058-2
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DOI: https://doi.org/10.1007/s42757-020-0058-2