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Title: Numerical investigation on transverse heat transfer properties in cross section of full size Nb{sub 3}Sn CICC ITER conductor

Abstract

The contact mechanical characteristics in the cross section of the Nb{sub 3}Sn cable are sensitive to the cryogenic cooling and cyclic transverse electromagnetic loads, which may affect the cable’s performance. In this paper, based on a proposed discrete dynamic model (DEM), where the contact heat transfer among strands and the convective heat transfer in liquid helium are taken into account, the cooling process under two heat transfer mechanisms is performed. Simulation results show that the temperature variation of Poloidal Field Insert Sample (PFIS) cable with time agrees well with the existing experimental results, and the role of contact heat transfer cannot be neglected during cryogenic cooling. It is obtained from the further analysis that the effect of contact heat transfer becomes more prominent with the decrease of mass flow rate of liquid helium, which leads to the stress status within cable changed significantly. With the temperature boundary condition imposed on the cable radial direction, the effective thermal conductivity (ETC) of cable can be obtained. It can be found that the ETC increases with increasing the transverse loads and is sensitive to the low temperature environment, while it is not affected by load cycles basically. These results may provide the guidemore » for the design and application of the future CICC conductors.« less

Authors:
;  [1];  [2];  [1];  [2];  [2]
  1. Key Laboratory of Mechanics on Environment and Disaster in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22488578
Resource Type:
Journal Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 5; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2158-3226
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CABLES; COOLING; CROSS SECTIONS; FLOW RATE; HEAT TRANSFER; HELIUM; LIQUIDS; SIMULATION; STRESSES; THERMAL CONDUCTIVITY

Citation Formats

Jia, Shuming, Wang, Dengming, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Zheng, Xiaojing, E-mail: xjzheng@lzu.edu.cn, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, and School of Electronical and Machanical Engineering, Xidian University, Xi’an, 710071. Numerical investigation on transverse heat transfer properties in cross section of full size Nb{sub 3}Sn CICC ITER conductor. United States: N. p., 2015. Web. doi:10.1063/1.4921088.
Jia, Shuming, Wang, Dengming, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Zheng, Xiaojing, E-mail: xjzheng@lzu.edu.cn, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, & School of Electronical and Machanical Engineering, Xidian University, Xi’an, 710071. Numerical investigation on transverse heat transfer properties in cross section of full size Nb{sub 3}Sn CICC ITER conductor. United States. doi:10.1063/1.4921088.
Jia, Shuming, Wang, Dengming, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Zheng, Xiaojing, E-mail: xjzheng@lzu.edu.cn, Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, and School of Electronical and Machanical Engineering, Xidian University, Xi’an, 710071. Fri . "Numerical investigation on transverse heat transfer properties in cross section of full size Nb{sub 3}Sn CICC ITER conductor". United States. doi:10.1063/1.4921088.
@article{osti_22488578,
title = {Numerical investigation on transverse heat transfer properties in cross section of full size Nb{sub 3}Sn CICC ITER conductor},
author = {Jia, Shuming and Wang, Dengming and Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000 and Zheng, Xiaojing, E-mail: xjzheng@lzu.edu.cn and Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000 and School of Electronical and Machanical Engineering, Xidian University, Xi’an, 710071},
abstractNote = {The contact mechanical characteristics in the cross section of the Nb{sub 3}Sn cable are sensitive to the cryogenic cooling and cyclic transverse electromagnetic loads, which may affect the cable’s performance. In this paper, based on a proposed discrete dynamic model (DEM), where the contact heat transfer among strands and the convective heat transfer in liquid helium are taken into account, the cooling process under two heat transfer mechanisms is performed. Simulation results show that the temperature variation of Poloidal Field Insert Sample (PFIS) cable with time agrees well with the existing experimental results, and the role of contact heat transfer cannot be neglected during cryogenic cooling. It is obtained from the further analysis that the effect of contact heat transfer becomes more prominent with the decrease of mass flow rate of liquid helium, which leads to the stress status within cable changed significantly. With the temperature boundary condition imposed on the cable radial direction, the effective thermal conductivity (ETC) of cable can be obtained. It can be found that the ETC increases with increasing the transverse loads and is sensitive to the low temperature environment, while it is not affected by load cycles basically. These results may provide the guide for the design and application of the future CICC conductors.},
doi = {10.1063/1.4921088},
journal = {AIP Advances},
issn = {2158-3226},
number = 5,
volume = 5,
place = {United States},
year = {2015},
month = {5}
}