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Impingement behaviour of single ethanol droplet on a liquid film of glycerol solution

  • Lili Lu
    ,
  • Yiqiang Pei
    ,
  • Jing Qin
    ,
  • Zhijun Peng
    ,
  • Yuqian Wang
    ,
  • Qingyang Zhu
  • Tianjin University
Research Output: Contribution to journal Article Peer-review

Abstract

Research on single drop impact, especially in the past two decades, has been motivated by a need for better predictive capability in many industries. However, there are few reports in the literature describing the case of single droplet impinging on liquid films with different physicochemical properties. In this study, laser-induced fluorescence (LIF) methods were used to clarify the impingement behaviour of millimetre-sized single ethanol droplets onto films of different concentrations of glycerol solution. The impingement behaviour is found to differ depending on the Weber number of the incident droplet and the viscosity and the thickness of the liquid film. New results on coalescence/splash thresholds criteria are obtained taking into account the incident droplet Weber number and liquid film characteristics. In addition, the formation mechanism and composition of secondary droplets and crown structures after collision are analysed. For the crown structure parameters, we found that the evolution of the crown height over time is affected by the combination of droplet and liquid film characteristics. The maximum height and diameter of the crown are proportional to the Weber number of the incident droplet, and these parameters can be predicted by the combination of the incident droplet Weber number and the liquid film Ohnesorge number.

Publication Information

Output type

Research Output: Contribution to journal Article Peer-review

Original language

English

Pages from-to (Number of pages)

Pages 117820

Journal (Volume, Issue Number)

Fuel (Volume 276)

Publication milestones

  • Accepted/In press - 07/04/2020
  • Published - 16/05/2020

Publication status

Published - 16/05/2020

ISSN

0016-2361

External Publication IDs

  • handle.net: 10547/624582
  • Scopus: 85084739448

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