Study on Resistance Characteristics of Capillary Flow in Screen Wick Based on CFD Method

Yu Qingyuan; Zhao Pengcheng; Ma Yugao; Zhang Yingnan

doi:10.13832/j.jnpe.2023.01.0054

Volume 44 Issue 1

Feb. 2023

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Yu Qingyuan, Zhao Pengcheng, Ma Yugao, Zhang Yingnan. Study on Resistance Characteristics of Capillary Flow in Screen Wick Based on CFD Method[J]. Nuclear Power Engineering, 2023, 44(1): 54-59. doi: 10.13832/j.jnpe.2023.01.0054

Citation:

Yu Qingyuan, Zhao Pengcheng, Ma Yugao, Zhang Yingnan. Study on Resistance Characteristics of Capillary Flow in Screen Wick Based on CFD Method[J]. Nuclear Power Engineering, 2023, 44(1): 54-59. doi: 10.13832/j.jnpe.2023.01.0054

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Study on Resistance Characteristics of Capillary Flow in Screen Wick Based on CFD Method

doi: 10.13832/j.jnpe.2023.01.0054

Yu Qingyuan^1
,,
Zhao Pengcheng^{1, 2
,
,},
Ma Yugao^{2, 3},
Zhang Yingnan²

1.
School of Nuclear Science and Technology, University of South China, Hengyang, Hunan, 421001, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
3.
Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

Received Date: 2022-02-15
Rev Recd Date: 2022-04-10
Publish Date: 2023-02-15

Abstract

Abstract

Screen wick heat pipe is a kind of passive heat transfer equipment based on the principle of two-phase flow phase change cycle. The capillary force and flow resistance in the cycle are closely related to the structure of the screen wick. The study of the resistance characteristics of the screen wick is of great significance to the selection and optimization of the screen wick structure and the improvement of the heat pipe performance. Based on computational fluid dynamics (CFD), a resistance model of capillary flow in screen is established to study the resistance characteristics of capillary flow in multi-layer wire screen wick. The model is used to simulate the capillary lifting experiment, and the relative error between the model and the experimental results is less than 5%. Based on the model, the effects of stacking structure and mesh number (50 mesh, 200 mesh, 400 mesh) on the flow resistance characteristics of screen wick are further analyzed. The results show that the denser the mesh is, the greater the flow resistance is, the viscous resistance coefficient is approximately proportional to the mesh number, and the equivalent inertia resistance increases with the increase of the mesh number. In the low velocity region where Reynolds number is less than 1, viscous resistance plays a dominant role, while in the velocity region where Reynolds number is greater than 1, inertia resistance cannot be ignored; The geometric structure of the screen wick not only affects the flow resistance, but also affects the capillary force. The calculation shows that the capillary pressure and flow resistance of the screen increase with the increase of mesh number, and the capillary performance factor slows down with the increase of mesh number. Considering the process limitation of plain woven screen, 400 mesh screen is ideal.
- Screen wick,
- Flow resistance,
- Viscous resistance,
- Inertial resistance,
- Capillary performance factor

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References(19)

References

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