Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump
As an important component of Negative ion based Neutral Beam Injector (NNBI), the cryopump mainly provides a suitable vacuum environment for beam generation and transmission. In the paper, Liquid nitrogen (LN2) pipe structure models of two cryopumps were established for simulation and experimental s...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573324004261 |
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| author | Qianxu Wang Yuanlai Xie Huihui Hong Yang Zhu Fang Wang Kun Tian Bin Li |
| author_facet | Qianxu Wang Yuanlai Xie Huihui Hong Yang Zhu Fang Wang Kun Tian Bin Li |
| author_sort | Qianxu Wang |
| collection | DOAJ |
| description | As an important component of Negative ion based Neutral Beam Injector (NNBI), the cryopump mainly provides a suitable vacuum environment for beam generation and transmission. In the paper, Liquid nitrogen (LN2) pipe structure models of two cryopumps were established for simulation and experimental studies. Thermal analysis of the thermal radiation shielding baffle (LN2 cooling) was carried out by Ansys steady-state thermal analysis software, while Fluent was used to simulate the two-phase flow in the LN2 pipeline, then the pressure drops, temperature, velocity, gas-phase volume fraction, and other parameters of the two pipeline structures were analyzed and compared. The simulation results show that the optimized structure B can reduce the pressure drop by 3 bar, the outlet temperature of structure A is 78.8 K, the outlet temperature of structure B is 79.2 K, the temperature difference is 0.4 K. The outlet velocity increases from 2.067 m/s to 4.947 m/s for Structure A, and from 1.096 m/s to 6.614 m/s for Structure B. The experiment results show that the outlet temperature of structure A is 79.4 K, meanwhile the outlet temperature of structure B is 80.1 K, the optimized structure B can reduce the pressure drop about 3 bar. |
| format | Article |
| id | doaj-art-97eb43c50a0043b6895a5acc0f07c085 |
| institution | Kabale University |
| issn | 1738-5733 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj-art-97eb43c50a0043b6895a5acc0f07c0852025-01-31T05:11:00ZengElsevierNuclear Engineering and Technology1738-57332025-02-01572103178Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopumpQianxu Wang0Yuanlai Xie1Huihui Hong2Yang Zhu3Fang Wang4Kun Tian5Bin Li6Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; University of Science and Technology of China, Hefei, 230026, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; Corresponding author.Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; University of Science and Technology of China, Hefei, 230026, ChinaHefei University of Technology, Hefei, 230009, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; University of Science and Technology of China, Hefei, 230026, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; University of Science and Technology of China, Hefei, 230026, ChinaAs an important component of Negative ion based Neutral Beam Injector (NNBI), the cryopump mainly provides a suitable vacuum environment for beam generation and transmission. In the paper, Liquid nitrogen (LN2) pipe structure models of two cryopumps were established for simulation and experimental studies. Thermal analysis of the thermal radiation shielding baffle (LN2 cooling) was carried out by Ansys steady-state thermal analysis software, while Fluent was used to simulate the two-phase flow in the LN2 pipeline, then the pressure drops, temperature, velocity, gas-phase volume fraction, and other parameters of the two pipeline structures were analyzed and compared. The simulation results show that the optimized structure B can reduce the pressure drop by 3 bar, the outlet temperature of structure A is 78.8 K, the outlet temperature of structure B is 79.2 K, the temperature difference is 0.4 K. The outlet velocity increases from 2.067 m/s to 4.947 m/s for Structure A, and from 1.096 m/s to 6.614 m/s for Structure B. The experiment results show that the outlet temperature of structure A is 79.4 K, meanwhile the outlet temperature of structure B is 80.1 K, the optimized structure B can reduce the pressure drop about 3 bar.http://www.sciencedirect.com/science/article/pii/S1738573324004261CRAFT NNBI cryopumpLN2Two-phase flowOptimization |
| spellingShingle | Qianxu Wang Yuanlai Xie Huihui Hong Yang Zhu Fang Wang Kun Tian Bin Li Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump Nuclear Engineering and Technology CRAFT NNBI cryopump LN2 Two-phase flow Optimization |
| title | Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump |
| title_full | Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump |
| title_fullStr | Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump |
| title_full_unstemmed | Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump |
| title_short | Analysis and optimization of LN2 two-phase flow in CRAFT NNBI cryopump |
| title_sort | analysis and optimization of ln2 two phase flow in craft nnbi cryopump |
| topic | CRAFT NNBI cryopump LN2 Two-phase flow Optimization |
| url | http://www.sciencedirect.com/science/article/pii/S1738573324004261 |
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