Numerical Study of the Influence of Rolling Motion on the Spacer Effect of Low Flow Convective Heat Transfer

Li Nan; Ding Guanqun; Xiao Yao; Li Junlong; Gu Hanyang

doi:10.13832/j.jnpe.2023.06.0054

Volume 44 Issue 6

Dec. 2023

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Li Nan, Ding Guanqun, Xiao Yao, Li Junlong, Gu Hanyang. Numerical Study of the Influence of Rolling Motion on the Spacer Effect of Low Flow Convective Heat Transfer[J]. Nuclear Power Engineering, 2023, 44(6): 54-62. doi: 10.13832/j.jnpe.2023.06.0054

Citation:

Li Nan, Ding Guanqun, Xiao Yao, Li Junlong, Gu Hanyang. Numerical Study of the Influence of Rolling Motion on the Spacer Effect of Low Flow Convective Heat Transfer[J]. Nuclear Power Engineering, 2023, 44(6): 54-62. doi: 10.13832/j.jnpe.2023.06.0054

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Numerical Study of the Influence of Rolling Motion on the Spacer Effect of Low Flow Convective Heat Transfer

doi: 10.13832/j.jnpe.2023.06.0054

School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

Received Date: 2023-01-04
Rev Recd Date: 2023-02-16

Available Online: 2023-12-11

Publish Date: 2023-12-15

Abstract

Abstract

A numerical study was carried out on the spacer effect of low flow convective heat transfer under rolling motion. The rolling model was verified based on the experimental data, then a model-based computational fluid dynamics (CFD) method was established. The results show that for the circumferential mean time-averaged heat transfer, the heat transfer downstream of the spacer is enhanced under low flow conditions. However, in the mixed convection deterioration recovery area and natural convection area, the spacer effect still has damping oscillation attenuation, and the oscillation amplitude decreases. For local time-averaged heat transfer, the hot spot always lies in the direction of vertical rolling axis, and the heat transfer is weakened in that direction under rolling motion, and the heat transfer weakening caused by the spacer in that direction is further enhanced. For the instantaneous heat transfer at the hot spot, the maximum weakening degree of the instantaneous heat transfer coefficient can reach 40% of the fullt developed steady state, which needs to be paid attention to in safety analysis.
- Rolling motion,
- Spacer effect,
- Exponential attenuation,
- Damping oscillation,
- Heat transfer weakening

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References(18)

References

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