Numerical study on porosity distribution and hydrodynamics of packed bed in narrow square channels

Hamzah, Anthony Basuni; Yoshikawa, Shiro; Matsumoto, Hideyuki

doi:10.1016/j.cep.2020.107905

Cited by 3 publications

(4 citation statements)

References 36 publications

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“…To reveal the effects of the fixed wall and aspect ratio on the packing structures, the local packing fraction (γlocal) was calculated based on the line-averaged method. The detailed calculation method can refer to the literature [30,46]. Taking a rectangular pebble Figure 7 shows that when the cross-sectional area is fixed, the D e of the rectangular tubes decreases gradually with the increase in the aspect ratio α of the rectangular tubes, which might be the reason that the γ avg of the rectangular pebble bed decreases gradually with the increase in aspect ratio α.…”

Section: Effect Of the Aspect Ratio Of Rectangular Tubementioning

confidence: 99%

Section: Effect Of the Aspect Ratio Of Rectangular Tubementioning

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%

“…The results show that the extent of the wall effect on the packing structures is also affected by filling strategies, such as vibration, compression, and confined top walls. Hamzah et al [46] and Beavers et al [44] explored the porosity variation and flow behavior in square pebble beds. Several equations were also proposed to predict the local porosity distributions in three defined zones in a square pebble bed.…”

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: Effect Of the Aspect Ratio Of Rectangular Tubementioning

confidence: 99%

Section: Effect Of the Aspect Ratio Of Rectangular Tubementioning

confidence: 99%