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

Autor: Ronghua Chen, Minghao Zhang, Kailun Guo, Dawei Zhao, Wenxi Tian, Guanghui Su, Suizheng Qiu
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Science and Technology of Nuclear Installations, Vol 2019 (2019)
Druh dokumentu: article
ISSN: 1687-6075
1687-6083
DOI: 10.1155/2019/2045751
Popis: 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.
Databáze: Directory of Open Access Journals
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