CFD prediction of critical heat flux in vertical heated tubes with uniform and non-uniform heat flux

•Eulerian two-fluid model coupled with extended wall boiling model within a CFD code.•Simulation of DNB in vertical heated tubes under high pressures with STAR-CCM+ 10.04.•New methods developed to predict CHF in both uniform and non-uniform heated tubes.•The results showed some differences between u...

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Bibliographic Details
Published in:Nuclear engineering and design 2018-01, Vol.326, p.403-412
Main Authors: Li, Quan, Avramova, M., Jiao, Yongjun, Chen, Ping, Yu, Junchong, Pu, Zengping, Chen, Jie
Format: Article
Language:English
Subjects:
Analytical chemistry
Atmosphere
Boiling
Boiling curves
Computational fluid dynamics
Computer simulation
Coupled walls
Critical heat flux
DNB
Flow rates
Fluctuations
Heat
Heat flux
Heat transfer
Hydrogen
Mass flow rate
Mathematical models
Non-uniform heat flux
Nucleate boiling
Sensitivity analysis
Subcooled boiling
Temperature
Tubes
Two fluid models
Void fraction
Wall temperature
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Summary:•Eulerian two-fluid model coupled with extended wall boiling model within a CFD code.•Simulation of DNB in vertical heated tubes under high pressures with STAR-CCM+ 10.04.•New methods developed to predict CHF in both uniform and non-uniform heated tubes.•The results showed some differences between uniform and non-uniform heated cases. In this paper, Eulerian Two-fluid model coupled with extended wall boiling model was used to simulate the departure from nucleate boiling (DNB) in vertical heated tubes under high pressures by using STAR-CCM+ 10.04. Based on CFD approach, new methods were developed to predict the critical heat flux (CHF) in both uniform and non-uniform heated tubes. The results showed some differences between the uniform and non-uniform heated cases. The transition in boiling curves was used as the criterion of DNB for uniform heat flux while the peaks of wall temperature and near wall void fraction were used for non-uniform cases. Good agreement was obtained between the predictions and experimental data, including both the values of critical heat flux and their locations. For uniform heat flux, sensitivity analysis for pressure, local quality and mass flow rate were performed, and the results showed that the new prediction method could work well under a wide range of conditions except under the high local quality and low mass flow rate conditions. The mechanism of this prediction method was discussed as well.
ISSN:0029-5493
1872-759X
DOI:10.1016/j.nucengdes.2017.11.009