Study on the Deformation and Breakup Process of Jet Falling Film in Crossflow

Chen Qiuxiang; Hu Hongfei; Wang Haijun; Yang Kuang; Xu Bo

doi:10.13832/j.jnpe.2024.06.0075

Volume 45 Issue 6

Dec. 2024

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Chen Qiuxiang, Hu Hongfei, Wang Haijun, Yang Kuang, Xu Bo. Study on the Deformation and Breakup Process of Jet Falling Film in Crossflow[J]. Nuclear Power Engineering, 2024, 45(6): 75-83. doi: 10.13832/j.jnpe.2024.06.0075

Citation:

Chen Qiuxiang, Hu Hongfei, Wang Haijun, Yang Kuang, Xu Bo. Study on the Deformation and Breakup Process of Jet Falling Film in Crossflow[J]. Nuclear Power Engineering, 2024, 45(6): 75-83. doi: 10.13832/j.jnpe.2024.06.0075

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Study on the Deformation and Breakup Process of Jet Falling Film in Crossflow

doi: 10.13832/j.jnpe.2024.06.0075

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

Received Date: 2024-01-11
Rev Recd Date: 2024-03-30
Publish Date: 2024-12-17

Abstract

Abstract

To investigate the deformation and breakup process of jet falling film in crossflow, a two-phase numerical simulation based on CFD software is conducted in this study. It is found that the inertia of the falling film flow and the lateral development of the initial Kelvin-Helmholtz (K-H) instability wave lead to the lateral fracture of the falling film in the initial stage of flow, resulting in the formation of several dry spots, while the dry spot occurs earlier on the windward side of the falling film than on the leeward side. The results show that there are two main breakup modes of falling film in crossflow: liquid film breakup and surface breakup. Liquid film breakup refers to the fracture and breakup along the flow direction of the falling film dominated by the Rayleigh-Taylor (R-T) unstable wave, while surface breakup refers to the peeling of liquid filaments and droplets on the windward side of the falling film dominated by the K-H unstable wave. The liquid to gas momentum ratio plays a significant role on the deformation and breakup process of jet falling film in crossflow. When the liquid to gas momentum ratio is greater than 13.16, surface breakup is the main breakup form of falling film. As the liquid to gas momentum ratio decreases, both surface breakup and liquid film breakup of the falling film increase simultaneously, leading to a significant increase of the falling film breakup. The continuous flow length and spanwise width of the jet falling film increase with the increase of the liquid to gas momentum ratio, while the offset distance of the falling film decreases with the increase of the liquid to gas momentum ratio.
- Jet falling film,
- Crossflow,
- Surface wave,
- Deformation and breakup,
- Liquid to gas momentum ratio

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References(14)

References

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