Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed
Helium cooled solid breeder blanket as an important blanket candidate of the Tokamak fusion reactor uses ceramic pebble bed for tritium breeding. Considering the poor effective thermal conductivity of the ceramic breeder pebble bed, thin structure of tritium breeder pebble bed is usually adopted in...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-07-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573321000346 |
| _version_ | 1819259894105112576 |
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| author | Shuang Wang Shuai Wang Bowen Wu Yuelin Lu Kefan Zhang Hongli Chen |
| author_facet | Shuang Wang Shuai Wang Bowen Wu Yuelin Lu Kefan Zhang Hongli Chen |
| author_sort | Shuang Wang |
| collection | DOAJ |
| description | Helium cooled solid breeder blanket as an important blanket candidate of the Tokamak fusion reactor uses ceramic pebble bed for tritium breeding. Considering the poor effective thermal conductivity of the ceramic breeder pebble bed, thin structure of tritium breeder pebble bed is usually adopted in the blanket design. The container wall has a great influence on the thin pebble bed packing structure, especially for the assembly of mono-sized particles, and thin pebble bed will appear anisotropic effective thermal conductivity phenomenon. In this paper, thin ceramic pebble beds composed of 1 mm diameter Li4SiO4 particles are generated by the EDEM 2.7. The effective thermal conductivity of different thickness pebble beds in the three-dimensional directions are analyzed by three-dimensional thermal network method. It is observed that thin Li4SiO4 pebble bed showing anisotropic effective thermal conductivity under the practical design size. Normally, the effective thermal conductivity along the bed vertical direction is higher than the horizontal direction due to the gravity effect. As the thickness increases from 10 mm to 40 mm, the effective thermal conductivity of the pebble bed gradually increases. |
| first_indexed | 2024-12-23T19:17:15Z |
| format | Article |
| id | doaj.art-074b95b36ba9416981a367cfebcc74a7 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-23T19:17:15Z |
| publishDate | 2021-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-074b95b36ba9416981a367cfebcc74a72022-12-21T17:34:17ZengElsevierNuclear Engineering and Technology1738-57332021-07-0153721742183Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bedShuang Wang0Shuai Wang1Bowen Wu2Yuelin Lu3Kefan Zhang4Hongli Chen5School of Mechanical Engineering, Anhui Polytechnic University, Wuhu, Anhui, 241000, ChinaDepartment of Radiation Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China; Corresponding author.School of Mechanical Engineering, Anhui Polytechnic University, Wuhu, Anhui, 241000, ChinaSchool of Mechanical Engineering, Anhui Polytechnic University, Wuhu, Anhui, 241000, ChinaSchool of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, ChinaSchool of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, ChinaHelium cooled solid breeder blanket as an important blanket candidate of the Tokamak fusion reactor uses ceramic pebble bed for tritium breeding. Considering the poor effective thermal conductivity of the ceramic breeder pebble bed, thin structure of tritium breeder pebble bed is usually adopted in the blanket design. The container wall has a great influence on the thin pebble bed packing structure, especially for the assembly of mono-sized particles, and thin pebble bed will appear anisotropic effective thermal conductivity phenomenon. In this paper, thin ceramic pebble beds composed of 1 mm diameter Li4SiO4 particles are generated by the EDEM 2.7. The effective thermal conductivity of different thickness pebble beds in the three-dimensional directions are analyzed by three-dimensional thermal network method. It is observed that thin Li4SiO4 pebble bed showing anisotropic effective thermal conductivity under the practical design size. Normally, the effective thermal conductivity along the bed vertical direction is higher than the horizontal direction due to the gravity effect. As the thickness increases from 10 mm to 40 mm, the effective thermal conductivity of the pebble bed gradually increases.http://www.sciencedirect.com/science/article/pii/S1738573321000346Effective thermal conductivityAnisotropyPebble bedDiscrete element methodThree-dimensional thermal network method |
| spellingShingle | Shuang Wang Shuai Wang Bowen Wu Yuelin Lu Kefan Zhang Hongli Chen Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed Nuclear Engineering and Technology Effective thermal conductivity Anisotropy Pebble bed Discrete element method Three-dimensional thermal network method |
| title | Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| title_full | Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| title_fullStr | Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| title_full_unstemmed | Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| title_short | Effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| title_sort | effect of packing structure on anisotropic effective thermal conductivity of thin ceramic pebble bed |
| topic | Effective thermal conductivity Anisotropy Pebble bed Discrete element method Three-dimensional thermal network method |
| url | http://www.sciencedirect.com/science/article/pii/S1738573321000346 |
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