Applicability research of round tube CHF mechanistic model in rod bundle channel

Liu, Wei; Peng, Shinian; Shan, Jianqiang; Jiang, Guangming; Liu, Yu; Deng, Jian; Hu, Ying

doi:10.1016/j.net.2020.07.023

Cited by 2 publications

(1 citation statement)

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“…Under subcooled and low quality flow boiling conditions, a general CHF mechanistic model is essential to the thermalhydraulic design and safety analysis. Based on the mechanism of superheated liquid layer depletion (Chun et al, 2000;Liu et al, 2021c), the net mass transfer from the bulk liquid to the superheated liquid layer caused by turbulent velocity fluctuations of flowing bubbles is determined, and a new calculation method of superheated liquid layer thickness is developed (Liu et al, 2021b). After matching with other constitutive equations, a novel CHF mechanistic model for subcooled and low quality flow boiling conditions has been developed, as shown in Figure 3.…”

Section: Dnb Regime Chf Mechanistic Modelmentioning

confidence: 99%

Investigation on Rod Bundle CHF Mechanistic Model for DNB and DO Prediction Under Wide Parameter Range

et al. 2021

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For a water cooled reactor, the key thermal-hydraulic parameters span a wide range corresponding to different CHF regimes. Under accident conditions, due to the flow regime transition and interchannel mixing effect, the corresponding CHF can transition from the DO to DNB regime. In order to continuously and accurately predict DNB and DO regime CHF under wide parameter range for rod bundle channel, a comprehensive CHF mechanistic model covering the DNB and DO regime CHF prediction is established based on the rod bundle CHF-regime criterion. The DNB regime CHF mechanistic model of superheated liquid layer depletion under turbulence fluctuation bubbles and the mature DO regime CHF mechanistic model are combined to form the comprehensive CHF model. Furthermore, the comprehensive CHF model is assessed by 5 × 5 rod bundle CHF experimental data independently obtained by the Nuclear Power Institute of China (NPIC). The statistical evaluation and parametric trend analysis show that the maximum mean error of P/M is within ±22%, and the local pressure, mass flux, and quality do not have any effects on the average deviations of the predicted flux P from the measured flux M. This indicates that the comprehensive CHF mechanistic model can accurately and continuously predict the DNB and DO regime CHF in the rod bundle channel.

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Section: Dnb Regime Chf Mechanistic Modelmentioning

confidence: 99%