| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Discussion on interface deformation and liquid breakup mechanism in vapor-liquid two-phase flow |
| Xiang An(安祥)1, Bo Dong(董波)2,†, Ya-Jin Zhang(张雅瑾)2, and Xun Zhou(周训)3 |
1 School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China;
2 Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;
3 Institute of Refrigeration and Air Conditioning Technology, Henan University of Science and Technology, Luoyang 471003, China |
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Abstract The interface deformation and liquid breakup in vapor-liquid two-phase flow are ubiquitous in natural phenomena and industrial applications. It is crucial to understand the corresponding mechanism correctly. The droplet and liquid ligament dynamic behaviors are investigated in this work by simulating three benchmark cases through adopting a three-dimensional (3D) phase-field-based lattice Boltzmann model, and vapor-liquid phase interface deformation and liquid breakup mechanisms including the capillary instability and end-pinching mechanism are analyzed. The analysis results show that the capillary instability is the driving mechanism of the liquid breakup and the secondary droplet production at a large Weber number, which is different from the Rayleigh-Taylor instability and Kelvin-Helmholtz instability characterizing the vapor-liquid interface deformation. In addition, as another liquid breakup mechanism, the end-pinching mechanism, which describes the back-flow phenomenon of the liquid phase, works at each breakup point, thus resulting in capillary instability on the liquid phase structure. In essence, it is the fundamental mechanism for the liquid breakup and the immanent cause of capillary instability.
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Received: 27 December 2022
Revised: 15 February 2023
Accepted manuscript online: 25 March 2023
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PACS:
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47.55.Ca
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(Gas/liquid flows)
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47.55.df
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(Breakup and coalescence)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51776031), the Fundamental Research Funds for Zhejiang Provincial Universities and Research Institutes, China, and the Key Project of Science and Technology Development of Henan Province, China (Grant No. 222102220033). |
Corresponding Authors:
Bo Dong
E-mail: bodong@dlut.edu.cn
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Cite this article:
Xiang An(安祥), Bo Dong(董波), Ya-Jin Zhang(张雅瑾), and Xun Zhou(周训) Discussion on interface deformation and liquid breakup mechanism in vapor-liquid two-phase flow 2023 Chin. Phys. B 32 094702
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