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Interaction of a planar shock wave and a water droplet embedded with a vapour cavity

Published online by Cambridge University Press:  06 January 2020

Yu Liang Open the ORCID record for Yu Liang [Opens in a new window] ,
Yazhong Jiang Open the ORCID record for Yazhong Jiang [Opens in a new window] ,
Chih-Yung Wen Open the ORCID record for Chih-Yung Wen [Opens in a new window]  and
Yao Liu
Yu Liang
Affiliation:
Department of Mechanical Engineering and Interdisciplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China Advanced Propulsion Laboratory, Department of Modern Mechanics, University of Science and Technology of China, Hefei230026, China
Yazhong Jiang*
Affiliation:
Department of Mechanical Engineering and Interdisciplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Chih-Yung Wen*
Affiliation:
Department of Mechanical Engineering and Interdisciplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Yao Liu
Affiliation:
Department of Mechanical Engineering and Interdisciplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
*
†Email addresses for correspondence: yazhong.jiang@polyu.edu.hk, chihyung.wen@polyu.edu.hk
†Email addresses for correspondence: yazhong.jiang@polyu.edu.hk, chihyung.wen@polyu.edu.hk
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Abstract

The interaction of a shock wave and a water droplet embedded with a vapour cavity is experimentally investigated in a shock tube for the first time. The vapour cavity inside the droplet is generated by decreasing the surrounding pressure to the saturation pressure, and an equilibrium between the liquid phase and the gas phase is obtained inside the droplet. Direct high-speed photography is adopted to capture the evolution of both the droplet and the vapour cavity. The formation of a transverse jet inside the droplet during the cavity-collapse stage is clearly observed. Soon afterwards, at the downstream pole of the droplet, a water jet penetrating into the surrounding air is observed during the cavity-expansion stage. The evolution of the droplet is strongly influenced by the evolution of the vapour cavity. The phase change process plays an important role in vapour cavity evolution. The effects of the relative size and eccentricity of the cavity on the movement and deformation of the droplet are presented quantitatively.

JFM classification

Drops and Bubbles: Drops Compressible Flows: Shock waves
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 885 , 25 February 2020 , R6
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Supplementary material: Image

Liang et al. supplementary movie 1

Evolution of the droplet embedded with a vapour cavity under the impact of a planar shock wave in experimental case 1.

Download Liang et al. supplementary movie 1(Image)
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Supplementary material: Image

Liang et al. supplementary movie 2

Evolution of the droplet embedded with a vapour cavity under the impact of a planar shock wave in experimental case 2.

Download Liang et al. supplementary movie 2(Image)
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Supplementary material: Image

Liang et al. supplementary movie 3

Evolution of the droplet embedded with a vapour cavity under the impact of a planar shock wave in experimental case 5.

Download Liang et al. supplementary movie 3(Image)
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Supplementary material: Image

Liang et al. supplementary movie 4

Evolution of the droplet embedded with a vapour cavity under the impact of a planar shock wave in experimental case 7.
Download Liang et al. supplementary movie 4(Image)
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Supplementary material: Image

Liang et al. supplementary movie 5

Evolution of the droplet embedded with a vapour cavity under the impact of a planar shock wave in experimental case 9.
Download Liang et al. supplementary movie 5(Image)
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