Numerical Investigation of the Influence of Microchannel Diffusion Welded Heat Exchanger Head Structure on Flow Characteristics

Fei Junjie; Liu Minyun; Xi Dapeng; Tang Jia; Liu Ruilong; Zan Yuanfeng; Huang Yanping

doi:10.13832/j.jnpe.2023.S2.0176

Volume 44 Issue S2

Dec. 2023

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Article Navigation > Nuclear Power Engineering > 2023 > 44(S2): 176-183

Fei Junjie, Liu Minyun, Xi Dapeng, Tang Jia, Liu Ruilong, Zan Yuanfeng, Huang Yanping. Numerical Investigation of the Influence of Microchannel Diffusion Welded Heat Exchanger Head Structure on Flow Characteristics[J]. Nuclear Power Engineering, 2023, 44(S2): 176-183. doi: 10.13832/j.jnpe.2023.S2.0176

Citation:

Fei Junjie, Liu Minyun, Xi Dapeng, Tang Jia, Liu Ruilong, Zan Yuanfeng, Huang Yanping. Numerical Investigation of the Influence of Microchannel Diffusion Welded Heat Exchanger Head Structure on Flow Characteristics[J]. Nuclear Power Engineering, 2023, 44(S2): 176-183. doi: 10.13832/j.jnpe.2023.S2.0176

Citation:

Fei Junjie, Liu Minyun, Xi Dapeng, Tang Jia, Liu Ruilong, Zan Yuanfeng, Huang Yanping. Numerical Investigation of the Influence of Microchannel Diffusion Welded Heat Exchanger Head Structure on Flow Characteristics[J]. Nuclear Power Engineering, 2023, 44(S2): 176-183. doi: 10.13832/j.jnpe.2023.S2.0176

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Numerical Investigation of the Influence of Microchannel Diffusion Welded Heat Exchanger Head Structure on Flow Characteristics

doi: 10.13832/j.jnpe.2023.S2.0176

1.
China National Nuclear Corporation Key Laboratory on Nuclear Reator Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

Received Date: 2023-07-20
Rev Recd Date: 2023-07-20
Publish Date: 2023-12-30

Abstract

Abstract

In order to comprehend and grasp the influence mechanism of head geometry on the flow distribution capacity of microchannel diffusion welded heat exchanger (MCD) with supercritical carbon dioxide (SCO₂) as working fluid, optimize the head structure design of MCD, improve the flow distribution uniformity of heat exchanger, and thus improve the heat exchange efficiency and safety, this study employed numerical simulation methods to investigate the flow and flow distribution performance of MCD heads with different structures. To address the limitations posed by hardware conditions on the grid resolution of complex heat exchanger models, a user-defined function (UDF) code which can be widely used for simulating fluid dynamics performance in MCDs was developed, which can greatly reduce the repetitive grid-related tasks and lower the hardware threshold of simulation calculation. The software Fluent was used to analyze the influence of local geometric parameters of the head (different head wall curve parameters, different porous baffle parameters, etc.) on pressure drop, flow distribution performance and flow field. The results show that the vortex generated in the cavity of the inlet head and the abrupt contraction-expansion structure of the outlet head can cause pressure loss. The head featuring lower-height secondary curved wall can effectively suppress vortex generation and reduce pressure loss attributed to the abrupt contraction-expansion structure, subsequently lowering header pressure drop and enhancing flow distribution performance.tributed to abrupt contraction-expansion structures, thus reducing the head pressure drop and improving the flow distribution performance.
- Microchannel diffusion welded heat exchanger (MCD),
- Head structure,
- Flow characteristics

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References(17)

References

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