| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Numerical simulation on partial coalescence of a droplet with different impact velocities |
| Can Peng(彭灿), Xianghua Xu(徐向华)†, and Xingang Liang(梁新刚) |
| Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Partial coalescence is a complicated flow phenomenon. In the present study, the coalescence process is simulated with the volume of fluid (VOF) method. The numerical results reveal that a downward high-velocity region plays a significant role in partial coalescence. The high-velocity region pulls the droplet downward continuously which is an important factor for the droplet turning into a prolate shape and the final pinch-off. The shift from partial coalescence to full coalescence is explained based on the droplet shape before the pinch-off. With the droplet impact velocity increasing, the droplet shape will get close to a sphere before the pinch-off. When the shape gets close enough to a sphere, the partial coalescence shifts to full coalescence. The effect of film thickness on the coalescence process is also investigated. With large film thickness, partial coalescence happens, while with small film thickness, full coalescence happens. In addition, the results indicate that the critical droplet impact velocity increases with the increase of surface tension coefficient but decreases with the increase of viscosity and initial droplet diameter. And there is a maximum critical Weber number with the increase of surface tension coefficient and initial droplet diameter.
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Received: 30 July 2020
Revised: 27 November 2020
Accepted manuscript online: 04 January 2021
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PACS:
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47.61.Jd
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(Multiphase flows)
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47.55.df
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(Breakup and coalescence)
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47.55.Ca
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(Gas/liquid flows)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51876102) and the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51621062). |
Corresponding Authors:
Xianghua Xu
E-mail: xxh@tsinghua.edu.cn
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Cite this article:
Can Peng(彭灿), Xianghua Xu(徐向华), and Xingang Liang(梁新刚) Numerical simulation on partial coalescence of a droplet with different impact velocities 2021 Chin. Phys. B 30 054703
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