An experimental study on the coalescence process of binary droplets in oil under ultrasonic standing waves

Xiaoming Luo, Juhang Cao, Limin He, Hongping Wang, Haipeng Yan, Yahua Qin

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The coalescence process of binary droplets in oil under ultrasonic standing waves was investigated with high-speed photography. Three motion models of binary droplets in coalescence process were illustrated: (1) slight translational oscillation; (2) sinusoidal translational oscillation; (3) migration along with acoustic streaming. To reveal the droplets coalescence mechanisms, the influence of main factors (such as acoustic intensity, droplet size, viscosity and interfacial tension, etc) on the motion and coalescence of binary droplets was studied under ultrasonic standing waves. Results indicate that the shortest coalescence time is achieved when binary droplets show sinusoidal translational oscillation. The corresponding acoustic intensity in this case is the optimum acoustic intensity. Under the optimum acoustic intensity, drop size decrease will bring about coalescence time decrease by enhancing the binary droplets oscillation. Moreover, there is an optimum interfacial tension to achieve the shortest coalescence time.

    Original languageEnglish
    Pages (from-to)839-846
    Number of pages8
    JournalUltrasonics Sonochemistry
    Volume34
    DOIs
    Publication statusPublished - 1 Jan 2017

    Fingerprint

    Coalescence
    standing waves
    Acoustics
    coalescing
    Oils
    ultrasonics
    oils
    Ultrasonics
    Acoustic intensity
    Surface Tension
    oscillations
    acoustics
    interfacial tension
    Photography
    Surface tension
    acoustic streaming
    Viscosity
    Acoustic streaming
    high speed photography
    drop size

    Cite this

    Luo, Xiaoming ; Cao, Juhang ; He, Limin ; Wang, Hongping ; Yan, Haipeng ; Qin, Yahua. / An experimental study on the coalescence process of binary droplets in oil under ultrasonic standing waves. In: Ultrasonics Sonochemistry. 2017 ; Vol. 34. pp. 839-846.
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    abstract = "The coalescence process of binary droplets in oil under ultrasonic standing waves was investigated with high-speed photography. Three motion models of binary droplets in coalescence process were illustrated: (1) slight translational oscillation; (2) sinusoidal translational oscillation; (3) migration along with acoustic streaming. To reveal the droplets coalescence mechanisms, the influence of main factors (such as acoustic intensity, droplet size, viscosity and interfacial tension, etc) on the motion and coalescence of binary droplets was studied under ultrasonic standing waves. Results indicate that the shortest coalescence time is achieved when binary droplets show sinusoidal translational oscillation. The corresponding acoustic intensity in this case is the optimum acoustic intensity. Under the optimum acoustic intensity, drop size decrease will bring about coalescence time decrease by enhancing the binary droplets oscillation. Moreover, there is an optimum interfacial tension to achieve the shortest coalescence time.",
    keywords = "Acoustic intensity, Binary droplets, Coalescence time, Interfacial tension, Ultrasonic standing waves",
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    An experimental study on the coalescence process of binary droplets in oil under ultrasonic standing waves. / Luo, Xiaoming; Cao, Juhang; He, Limin; Wang, Hongping; Yan, Haipeng; Qin, Yahua.

    In: Ultrasonics Sonochemistry, Vol. 34, 01.01.2017, p. 839-846.

    Research output: Contribution to journalArticle

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    AU - Luo, Xiaoming

    AU - Cao, Juhang

    AU - He, Limin

    AU - Wang, Hongping

    AU - Yan, Haipeng

    AU - Qin, Yahua

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    AB - The coalescence process of binary droplets in oil under ultrasonic standing waves was investigated with high-speed photography. Three motion models of binary droplets in coalescence process were illustrated: (1) slight translational oscillation; (2) sinusoidal translational oscillation; (3) migration along with acoustic streaming. To reveal the droplets coalescence mechanisms, the influence of main factors (such as acoustic intensity, droplet size, viscosity and interfacial tension, etc) on the motion and coalescence of binary droplets was studied under ultrasonic standing waves. Results indicate that the shortest coalescence time is achieved when binary droplets show sinusoidal translational oscillation. The corresponding acoustic intensity in this case is the optimum acoustic intensity. Under the optimum acoustic intensity, drop size decrease will bring about coalescence time decrease by enhancing the binary droplets oscillation. Moreover, there is an optimum interfacial tension to achieve the shortest coalescence time.

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    KW - Coalescence time

    KW - Interfacial tension

    KW - Ultrasonic standing waves

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