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Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed

Author

Listed:
  • Baoping Gong

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

  • Hao Cheng

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

  • Yongjin Feng

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

  • Xiaofang Luo

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

  • Long Wang

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

  • Xiaoyu Wang

    (Center for Fusion Science, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China)

Abstract

In the tritium breeding blanket of nuclear fusion reactors, the heat transfer behavior and thermal-mechanical response of the tritium breeder pebble bed are affected by the inner packing structure, which is crucial for the design and optimization of a reliable pebble bed in tritium breeding blanket. Thus, the effect of pebble size distribution and fixed wall effect on packing structure and contact force in the poly-disperse pebble bed were investigated by numerical simulation. The results show that pebble size distribution has a significant influence on the inner packing structure of pebble bed. With the increase of the dispersion of pebble size, the average porosity and the average coordination number of the poly-disperse pebble bed gradually decrease. Due to the influence of the fixed wall, the porosity distribution of the pebble bed shows an obvious wall effect. For poly-disperse pebble bed, the influenced region of the wall effect gradually decreases with the increase of the dispersion of pebble size. In addition, the gravity effect and the pebble size distribution have an obvious influence on the contact force distribution inside the poly-disperse pebble bed. The majority of the contact force are weak contact force that is less than the average contact force. Only a few of pebbles have strong contact force that is greater than average contact force. This investigation can help in analyzing the pebble crushing characteristics and the thermal hydraulic analysis in the poly-disperse tritium breeder pebble bed.

Suggested Citation

  • Baoping Gong & Hao Cheng & Yongjin Feng & Xiaofang Luo & Long Wang & Xiaoyu Wang, 2021. "Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed," Energies, MDPI, vol. 14(2), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:449-:d:481207
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    References listed on IDEAS

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    1. Adam Jan Zwierzyński & Wojciech Teper & Rafał Wiśniowski & Andrzej Gonet & Tomasz Buratowski & Tadeusz Uhl & Karol Seweryn, 2021. "Feasibility Study of Low Mass and Low Energy Consumption Drilling Devices for Future Space (Mining Surveying) Missions," Energies, MDPI, vol. 14(16), pages 1-17, August.
    2. Baoping Gong & Hao Cheng & Juemin Yan & Long Wang & Yongjin Feng & Xiaoyu Wang, 2023. "Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds," Energies, MDPI, vol. 16(1), pages 1-24, January.

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