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Research Papers: Heat and Mass Transfer

Particle-Scale Investigation of Thermal Radiation in Nuclear Packed Pebble Beds

[+] Author and Article Information
Hao Wu, Jiyuan Tu

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

Nan Gui, Xingtuan Yang, Shengyao Jiang

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 15, 2017; final manuscript received April 2, 2018; published online May 22, 2018. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 140(9), 092002 (May 22, 2018) (7 pages) Paper No: HT-17-1686; doi: 10.1115/1.4039913 History: Received November 15, 2017; Revised April 02, 2018

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.

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Figures

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Fig. 1

Subcell of the FCC packing in particle radiation model

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Fig. 2

The geometry and packing of HTTU experiment (sectional view)

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Fig. 3

Volume-based (a) and area-based (b) radial porosity distribution of the packed pebble bed

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Fig. 4

Radial ETC with area-based (a) and volume-based (b) porosity distribution

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Fig. 5

Radiation exchange factor under different surface emissivity in dense packed pebble beds

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Fig. 6

Voronoi cells of the heat transfer model in nuclear pecked pebble beds

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Fig. 7

The structure and packing of the experimental packed pebble bed of the TF-PBEC

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Fig. 8

Experimental results and particle-scale simulation of the transient heat transfer processes of TF-PBEC at half height

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Fig. 9

Packing and Voronoi tessellations of the multicomponent packed pebble beds (x is the volume percentage in all particles): (a) x1 = 0.4015, d1 = 60 mm; x2 = 0.5985, d2 = 90 mm; (b) x1 = 0.33, d1 = 60 mm; x2 = 0.67, d2 = 120 mm; and (c) x1 = 0.2104, d1 = 60 mm; x2 = 0.3919, d2 = 90 mm; x3 = 0.3977, d3 = 120 mm

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Fig. 10

Discrete simulation and the SCM with effective particle diameter of the binary mixtures of the packed pebble beds at 600 °C

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Fig. 11

The ETC of polydisperse packed pebble beds for the binary (a) and ternary (b) mixtures under different temperatures: (a) d1 = 60 mm; d2 = 90 mm and (b) x1 = 0.2104, d1 = 60 mm; 2 = 0.3919, d2 = 90 mm; x3 = 0.3977, d3 = 120 mm

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