Study on CHF characteristics in narrow rectangular channel under complex motion condition

Gui, Minyang; Tian, Wenxi; Wu, Di; Su, G.H.; Qiu, Suizheng

doi:10.1016/j.applthermaleng.2019.114629

Cited by 10 publications

(1 citation statement)

References 34 publications

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“…Hwang et al (2011) simulated CHF under heaving conditions using commercial codes, and the results showed that the CHF was much lower than that under static conditions because of gravity acceleration oscillation and the decrease of mass flow rate. Gui et al (2020) theoretically investigated CHF characteristics in a narrow rectangular channel by considering the additional forces due to heaving and rolling motions, and it was shown that the CHF decreased because of inlet flow oscillation. Liu et al (2018) developed a combining model investigating the CHF and the flow instability in ocean motion and found that heaving motion had little effect on CHF.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Pool Boiling Under Ocean Conditions with Lattice Boltzmann Simulation. Part Ⅰ: Heaving Condition

Zou

Liu

et al. 2021

Front. Energy Res.

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Pool boiling is the heat-transfer mechanism of many heat exchangers inside ocean nuclear power plants working under the complex marine circumstances. Also, ocean conditions will create a new acceleration field other than gravity for the fluid, which induces some unique thermal–hydraulic characteristics. In this study, pool boiling under heaving conditions is numerically simulated using multiple relaxation time phase change lattice Boltzmann method. Firstly, the simulated results under static condition have been validated with recognized empirical equations, such as Rohsenow’s correlation at nucleate boiling, Zuber’s model, and Kandlikar’s model about critical heat flux (CHF). Then, pool boiling patterns, the boiling curve of time-averaged heat flux, transient heat flux, and heaving effects on different pool boiling regions are investigated. The results show that pool boiling curves of time-averaged heat flux between heaving conditions and static conditions with middle superheat degrees are similar. Heat transfer under heaving conditions at low superheat is somewhat enhanced, and it is weakened at high superheat, which leads to a slightly smaller critical heat flux with larger superheat compared with that under static conditions. Moreover, distinct fluctuation of the transient heat flux of pool boiling under heaving conditions is found for all boiling regimes. Furthermore, the heaving condition shows both positive and negative effects on pool boiling heat transfer at high-gravity and low-gravity regions, respectively. Besides, both the larger heaving height and shorter period time bring out more violent heaving motion and make a greater impact on pool boiling heat transfer.

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Section: Introductionmentioning

confidence: 99%