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

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    Authors
    Lu, Lili
    Pei, Yiqiang
    Qin, Jing
    Peng, Zhijun
    Wang, Yuqian
    Zhu, Qingyang
    Affiliation
    Tianjin University
    University of Bedfordshire
    Issue Date
    2020-05-16
    Subjects
    crown
    impingement behaviour
    laser-induced fluorescence (LIF)
    splash
    
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    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.
    Citation
    Lu L, Pei Y, Qin J, Peng Z, Wang Y, Zhu Q (2020) 'Impingement behaviour of single ethanol droplet on a liquid film of glycerol solution', Fuel, 276, pp.117820.
    Publisher
    Elsevier Ltd
    Journal
    Fuel
    URI
    http://hdl.handle.net/10547/624582
    DOI
    10.1016/j.fuel.2020.117820
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0016236120308164
    Type
    Article
    Language
    en
    ISSN
    0016-2361
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuel.2020.117820
    Scopus Count
    Collections
    Computing

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