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

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