Microchannel cooling technique for dissipating high heat flux on W/Cu flat-type mock-up for EAST divertor

Mingxiang LU; Le HAN; Qi ZHAO; Juncheng QIU; Jianhong ZHOU; Dinghua HU; Nanyu MOU; Xuemei CHEN

doi:10.1088/2058-6272/ac684c

Plasma Science and Technology > 2022 > 24(9): 095602. > DOI: 10.1088/2058-6272/ac684c

Mingxiang LU, Le HAN, Qi ZHAO, Juncheng QIU, Jianhong ZHOU, Dinghua HU, Nanyu MOU, Xuemei CHEN. Microchannel cooling technique for dissipating high heat flux on W/Cu flat-type mock-up for EAST divertor[J]. Plasma Science and Technology, 2022, 24(9): 095602. DOI: 10.1088/2058-6272/ac684c

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Microchannel cooling technique for dissipating high heat flux on W/Cu flat-type mock-up for EAST divertor

1.
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
2.
Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

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Corresponding author:
Xuemei CHEN, E-mail: xuemeichen@njust.edu.cn
³ Mingxiang Lu and Le Han contributed equally to the article
Received Date: December 14, 2021
Revised Date: April 17, 2022
Accepted Date: April 18, 2022
Available Online: December 07, 2023
Published Date: July 12, 2022

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Abstract

Abstract

As an important component of tokamaks, the divertor is mainly responsible for extracting heat and helium ash, and the targets of the divertor need to withstand high heat flux of 10 MW m^-2 for steady-state operation. In this study, we proposed a new strategy, using microchannel cooling technology to remove high heat load on the targets of the divertor. The results demonstrated that the microchannel-based W/Cu flat-type mock-up successfully withstood the thermal fatigue test of 1000 cycles at 10 MW m^-2 with cooling water of 26 l min^-1, 30 ℃ (inlet), 0.8 MPa (inlet), 15 s power on and 15 s dwell time; the maximum temperature on the heat-loaded surface (W surface) of the mock-up was 493 ℃, which is much lower than the recrystallization temperature of W (1200 ℃). Moreover, no occurrence of macrocrack and 'hot spot' at the W surface, as well as no detachment of W/Cu tiles were observed during the thermal fatigue testing. These results indicate that microchannel cooling technology is an efficient method for removing the heat load of the divertor at a low flow rate. The present study offers a promising solution to replace the monoblock design for the EAST divertor.
- microchannel,
- divertor,
- flat-type,
- high heat flux test,
- EAST

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Acknowledgments

The authors acknowledge financial support from the National MCF Energy R & D Program (No. 2018YFE0312300), National Natural Science Foundation of China (No. 51706100), the Natural Science Foundation of Jiangsu Province (No. BK20180477) and Fundamental Research Funds for the Central Universities (No. 30918011205).

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Microchannel cooling technique for dissipating high heat flux on W/Cu flat-type mock-up for EAST divertor

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