Effects of fixed wall and pebble size ratio on packing properties and contact force distribution in binary-sized pebble mixed beds at the maximum packing efficiency state

Feng, Yongjin; Gong, Baoping; Cheng, Hao; Wang, Long; Wang, Xiaoyu

doi:10.1016/j.powtec.2021.05.099

Cited by 12 publications

(4 citation statements)

References 64 publications

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“…In this study, LIGGGHTS-PUBLIC [61] was employed. The pebble parameters used in this study are listed in Table 1 by referring to the parameters of the Li 4 SiO 4 ceramic pebbles in the literature [7,8,11,31]. The heights of all pebble beds are higher than 60 mm.…”

Section: Simulation Methods and Parametersmentioning

confidence: 99%

“…The packing characteristics of randomly packed pebble beds are influenced by many factors, such as container dimension and shape, pebble size distribution, and packing mode [28][29][30][31][32][33][34][35][36][37][38]. Since most pebble beds are confined by a cylindrical wall in many applications, the packing structures of cylindrical beds have been widely investigated [17][18][19]23].…”

Section: Introductionmentioning

confidence: 99%

“…Several empirical prediction models of the average and radial porosity distribution were reviewed by Antwerpen et al [28] and Seckendorff et al [29]. In addition, the pebble packing in containers with other shapes, such as annular [25,[38][39][40][41][42] and square and rectangular columns [31,[43][44][45][46][47][48], were also used in the nuclear energy system. For instance, Reimann et al [35,42] explored the packing characteristics of cylindrical, annular, and prismatic pebble beds packed with unary pebbles.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

et al. 2023

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The packing characteristics of a pebble bed are essential to understand the heat- and mass-transfer processes occurring within a granular system. Therefore, the packing characteristics of rectangular prismatic pebble beds randomly packed with mono-sized pebbles are analyzed. In terms of the average and local packing fraction distribution, coordination number, and radial distribution function, the effects of the rectangular tube aspect ratio and cross-sectional area on the packing properties of pebble beds are explored in depth. The findings indicate that the packing structures of the rectangular pebble bed exhibit noticeable fixed-wall effects. The average packing fraction and coordination number gradually decline as the rectangular tube aspect ratio rises. Close to the fixed wall, a noticeable wall effect can be seen in the distribution of axial and local packing fractions and the pebble center distribution. The wall effect has an increasing effect on the axial and local packing fraction distributions in rectangular tubes with increasing aspect ratios. Additionally, the average packing fraction and the average coordination number also increase as the cross-sectional area increases, indicating a gradual weakening of the wall effect as the cross-sectional area increases. Furthermore, the cross-sectional area and aspect ratio of the rectangular tubes affect the RDF values of the rectangular pebble beds but have no impact on the RDF features. The findings reported in this paper will be helpful for designing and optimizing pebble beds in the breeding blanket of fusion reactors.

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Section: Simulation Methods and Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

et al. 2023

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“…To increase the tritium production rate, neutron multiplication is usually achieved by adding neutron multiplier materials, such as beryllium or beryllide, into the blanket [3,4]. To mitigate the swelling effect of neutron irradiation and facilitate tritium extraction, tritium breeders and neutron multipliers are usually in the form of spherical or pebble-like particles, which are packed in the different cavities of the solid blanket [5][6][7]. For instance, the Li 4 SiO 4 pebbles and beryllium (Be) pebbles with diameters of ~1 mm are selected as tritium breeders and neutron multipliers, respectively, in helium-cooled ceramic breeder test blanket modules (HCCB TBMs) [8,9] and Chinese Fusion Engineering Test Reactor (CFETR) HCCBs [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Pressure Drops of Purge Gas Helium in Packed Pebble Beds for Nuclear Fusion Blanket

Cheng,

Gong,

Zhou

et al. 2024

Energies

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The flow characteristics of purge gas helium in the pebble bed of the tritium breeding blanket are important in analyzing the tritium purging process and optimizing the design of the solid breeder blanket. Therefore, the flow characteristics of helium gas in randomly packed pebble beds are investigated experimentally with a focus on the analysis of the pressure loss distribution. The results show that gas velocity, bed dimension, and pebble diameters have an obvious influence on the helium flow characteristics in pebble beds. With the increase in the inlet helium gas velocity, the pressure drop gradient of helium in the pebble bed gradually increased. With increases in the pebble bed dimension, the pressure drop gradient of helium in the pebble bed gradually increased. With the increase in the pebble diameter, the pressure drop gradient gradually decreased. In addition, the effect of temperature on the pressure drop of helium in the pebble bed was also preliminarily investigated. The pressure drop gradient of the helium through the pebble bed obviously increased with the increase in the helium and the bed temperature. The experimentally obtained pressure loss characteristics can be used for the validation of the simulation of a blanket pebble bed and as input parameters in the thermo-hydraulic analysis of solid-tritium breeder blankets.

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Effect of Size Ratio on Permeability and Local Packing Fraction of the Binary Packed Bed

Kumar,

Saha,

Sharma

2024

Lecture Notes in Mechanical Engineering

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Effects of fixed wall and pebble size ratio on packing properties and contact force distribution in binary-sized pebble mixed beds at the maximum packing efficiency state

Cited by 12 publications

References 64 publications

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

Experimental Investigation on Pressure Drops of Purge Gas Helium in Packed Pebble Beds for Nuclear Fusion Blanket

Effect of Size Ratio on Permeability and Local Packing Fraction of the Binary Packed Bed

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