Effective Thermal Property Estimation of Unitary Pebble Beds Based on a CFD-DEM Coupled Method for a Fusion Blanket

CHEN Lei (陈磊); CHEN Youhua (陈有华); HUANG Kai (黄凯); LIU Songlin (刘松林)

doi:10.1088/1009-0630/17/12/18

Plasma Science and Technology > 2015 > 17(12): 1083-1087. > DOI: 10.1088/1009-0630/17/12/18

CHEN Lei (陈磊), CHEN Youhua (陈有华), HUANG Kai (黄凯), LIU Songlin (刘松林). Effective Thermal Property Estimation of Unitary Pebble Beds Based on a CFD-DEM Coupled Method for a Fusion Blanket[J]. Plasma Science and Technology, 2015, 17(12): 1083-1087. DOI: 10.1088/1009-0630/17/12/18

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Effective Thermal Property Estimation of Unitary Pebble Beds Based on a CFD-DEM Coupled Method for a Fusion Blanket

1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2University of Science and Technology of China, Hefei 230027, China

Funds: supported by National Special Project for Magnetic Confined Nuclear Fusion Energy of China (Nos. 2013GB108004, 2015GB108002, 2014GB122000 and 2014GB119000), and National Natural Science Foundation of China (No. 11175207)

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Received Date: February 09, 2015

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Abstract

Abstract

Lithium ceramic pebble beds have been considered in the solid blanket design for fusion reactors. To characterize the fusion solid blanket thermal performance, studies of the effective thermal properties, i.e. the effective thermal conductivity and heat transfer coefficient, of the pebble beds are necessary. In this paper, a 3D computational fluid dynamics discrete element method (CFD-DEM) coupled numerical model was proposed to simulate heat transfer and thereby estimate the effective thermal properties. The DEM was applied to produce a geometric topology of a prototypical blanket pebble bed by directly simulating the contact state of each individual particle using basic interaction laws. Based on this geometric topology, a CFD model was built to analyze the temperature distribution and obtain the effective thermal properties. The current numerical model was shown to be in good agreement with the existing experimental data for effective thermal conductivity available in the literature.
- fusion blanket,
- pebble bed,
- effective thermal properties,
- discrete element method,
- computational fluid dynamics

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References

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