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Dynamics and morphology of droplet penetrating a soap film

Published online by Cambridge University Press:  29 December 2021

Yanju Wei Open the ORCID record for Yanju Wei [Opens in a new window] ,
Zhiqiang Mu ,
Yajie Zhang ,
Yajing Yang ,
Shenghua Liu ,
Chung K. Law  and
Abhishek Saha Open the ORCID record for Abhishek Saha [Opens in a new window]
Yanju Wei*
Affiliation:
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
Zhiqiang Mu
Affiliation:
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
Yajie Zhang
Affiliation:
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
Yajing Yang
Affiliation:
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, PR China
Shenghua Liu
Affiliation:
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
Chung K. Law
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, NJ 08544, USA
Abhishek Saha
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92093, USA
*
† Email address for correspondence: weiyanju@xjtu.edu.cn
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Abstract

This work reports experimental observation and theoretical explanation of the dynamics and morphology of a droplet passing through a soap film. During the process, the film undergoes four sequential responses: (1) film deformation upon droplet impact; (2) drop–film detachment; (3) coalescence of the film shell with the drop; (4) peel-off of the film shell. Physical models and the corresponding analytical expressions are developed to reveal the underlying physics for the observed four responses. It is identified that the film is an elongated catenoid under continuous stretch by the droplet, and that they separate at the fixed height of 5.8 times of the droplet radius while the detach point is located at the centre of the height. After separation, the droplet is wrapped with a film shell, which is then punctured by the ring tip of the converging surface wave at the impacting Weber number range of [45, 225]. The film shell then coalesces with the droplet, falls off with a fixed velocity and is eventually ejected as a bubble leaving the droplet with a transplanted surface of the soap solution.

JFM classification

Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Bubble dynamics Interfacial Flows (free surface): Contact lines
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 933 , 25 February 2022 , A32
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Wei et al. supplementary movie 1

Film peeling-off, We=126

Download Wei et al. supplementary movie 1(Video)
Video 226.2 KB

Wei et al. supplementary movie 2

Occasional cushion break, We=20

Download Wei et al. supplementary movie 2(Video)
Video 672.1 KB

Wei et al. supplementary movie 3

Rebounding, We=14

Download Wei et al. supplementary movie 3(Video)
Video 760.3 KB

Wei et al. supplementary movie 4

Pocket-free packaging, We=31

Download Wei et al. supplementary movie 4(Video)
Video 454.4 KB

Wei et al. supplementary movie 5

Pocketed film packaging, We=280

Download Wei et al. supplementary movie 5(Video)
Video 186.7 KB

Wei et al. supplementary movie 6

Drop-film coalescence on impact, We=352

Download Wei et al. supplementary movie 6(Video)
Video 212.6 KB
Supplementary material: PDF

Wei et al. supplementary movie material

Analysis report

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PDF 2.9 MB