Numerical Study of Bubble Rising and Coalescence Characteristics under Flow Pulsation Based on Particle Method

Two-phase flow instability may occur in nuclear reactor systems, which is often accompanied by periodic fluctuation in fluid flow rate. In this study, bubble rising and coalescence characteristics under inlet flow pulsation condition are analyzed based on the MPS-MAFL method. To begin with, the sing...

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Bibliographic Details
Published in:Science and technology of nuclear installations 2019-01, Vol.2019 (2019), p.1-13
Main Authors: Qiu, Suizheng, Tian, Wenxi, Zhao, Dawei, Guo, Kailun, Zhang, Minghao, Chen, Ronghua, Su, Guanghui
Format: Article
Language:English
Subjects:
Aqueous solutions
Bubbles
Chemical engineering
Coalescing
Computational fluid dynamics
Computer simulation
Experiments
Flow stability
Flow velocity
Fluid flow
Glycerol
Inlet flow
Nuclear energy
Nuclear engineering
Nuclear power plants
Nuclear reactors
Numerical analysis
Periodic variations
Pulsation
Reynolds number
Science
Simulation
Two phase flow
Velocity
Wavelet transforms
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Summary:Two-phase flow instability may occur in nuclear reactor systems, which is often accompanied by periodic fluctuation in fluid flow rate. In this study, bubble rising and coalescence characteristics under inlet flow pulsation condition are analyzed based on the MPS-MAFL method. To begin with, the single bubble rising behavior under flow pulsation condition was simulated. The simulation results show that the bubble shape and rising velocity fluctuate periodically as same as the inlet flow rate. Additionally, the bubble pairs’ coalescence behavior under flow pulsation condition was simulated and compared with static condition results. It is found that the coalescence time of bubble pairs slightly increased under the pulsation condition, and then the bubbles will continue to pulsate with almost the same period as the inlet flow rate after coalescence. In view of these facts, this study could offer theory support and method basis to a better understanding of the two-phase flow configuration under flow pulsation condition.
ISSN:1687-6075
1687-6083
DOI:10.1155/2019/2045751