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

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 necess...

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Published inPlasma science & technology Vol. 17; no. 12; pp. 1083 - 1087
Main Author 陈磊 陈有华 黄凯 刘松林
Format Journal Article
LanguageEnglish
Published 01.12.2015
Subjects
Computer simulation
Discrete element method
Heat transfer
Joining
Mathematical models
Pebble bed
Thermal conductivity
Thermal properties
卵石层
参数估计
核聚变反应堆
热物性
相互作用规律
耦合数值模型
耦合方法
计算流体力学
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ISSN1009-0630
DOI10.1088/1009-0630/17/12/18

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Summary: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.
Bibliography: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.
topology ceramic characterize thereby packing lithium packed cubic Distance Diameter
34-1187/TL
CHEN Lei, CHEN Youhua , HUANG Kai, LIU Songlin（1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China; 2University of Science and Technology of China, Hefei 230027, China）
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SourceType-Scholarly Journals-1
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ISSN:1009-0630
DOI:10.1088/1009-0630/17/12/18