首页|Effects of vibration conditions,spatial confinement and friction on mixing and segregation characteristics of mixed pebble beds for CFETR WCCB blanket

Effects of vibration conditions,spatial confinement and friction on mixing and segregation characteristics of mixed pebble beds for CFETR WCCB blanket

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This paper presents the study of the dynamic characteristics of confined mixed pebble beds with different friction under different vibration conditions using the discrete element method.The λ segre-gation index is used to quantify the degree of particle mixing or segregation.The percolation,convection and diffusion mechanisms are responsible for the segregation patterns of the mixed pebble.The results show the degree of segregation can be suppressed by decreasing the vibration acceleration or free space height below a threshold.Further simulation reveals the threshold of vibration acceleration or free space height both are related to the bed height increment which determines the strength of the percolation mechanism.In addition,the strength of percolation and convection becomes weaker by decreasing the friction of particles and walls,which makes the pebbled bed remains in a mixed state under vibration.These findings are significant to clarify the main factors behind the three segregation mechanisms and hence provide solutions to retaining the mixed state of the Li2TiO3&Be12Ti mixed pebble bed.

VibrationSegregationBinary pebble bedDiscrete element method

Yong Liu、Chongyang He、Cong Wang、Lei Chen、Songlin Liu

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Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,230031,China

University of Science and Technology of China,Hefei,230027,China

Chengdu University,Chengdu,610106,China

Zhejiang Lab,Hangzhou,310000,China

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National MCF Energy R&D ProgramComprehensive Research Facility for Fusion Technology(CRAFT)Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScience Foundation of ASIPP

2019YFE031300012018-000052-73-01-0012281210531512205330DSJJ-2021-05

2024

10.1016/j.partic.2023.06.018

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.85(2)
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