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  • Synchronized generation and coalescence of largely dissimilar microdroplets governed by pulsating continuous-phase flow

    Author(s)
    Zhang, YY
    Xia, HM
    Wu, JW
    Zhang, J
    Wang, ZP
    Griffith University Author(s)
    Zhang, Jun
    Year published
    2019
    Metadata
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    Abstract
    The effects of pulsating continuous-phase flow on droplet generation at a T-junction are investigated. The pulsating perturbation produced by a microfluidic oscillator is found to govern the droplet formation. In this way, the droplet size, the generation frequency, and the fluid properties become uncorrelated. Within a wide viscosity (1–60 cP) and flow rate range [Qd,max/Qd,min is on the order of O(102)] of the discrete fluid, the droplet volume increases linearly with Qd and hence can be easily tuned. Using a single perturbation source, microdroplets of largely different viscosities and volumes can be synchronously generated, ...
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    The effects of pulsating continuous-phase flow on droplet generation at a T-junction are investigated. The pulsating perturbation produced by a microfluidic oscillator is found to govern the droplet formation. In this way, the droplet size, the generation frequency, and the fluid properties become uncorrelated. Within a wide viscosity (1–60 cP) and flow rate range [Qd,max/Qd,min is on the order of O(102)] of the discrete fluid, the droplet volume increases linearly with Qd and hence can be easily tuned. Using a single perturbation source, microdroplets of largely different viscosities and volumes can be synchronously generated, facilitating subsequent precise control and manipulations such as one-to-one coalescence. Passively, monodisperse droplets can be formed following the squeezing, dripping, or tip-streaming mode.1–3 But the droplet size and generation frequency cannot be independently controlled as they correlate with each other. In addition, they are further influenced by the channel geometries, fluid properties, and flow rates (and their ratio) of the continuous and discrete phase.4,5 In comparison, active modulation of droplet generation provides a better control.6,7 Relevant methods include applying electric or magnetic fields8–13 and using mechanical/piezoelectric vibrators,14–16 microvalves, and micropumps.17–19 The required actuators and controllers usually raise the fabrication and operational complexity.
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    Journal Title
    APPLIED PHYSICS LETTERS
    Volume
    114
    Issue
    7
    DOI
    https://doi.org/10.1063/1.5084188
    Subject
    Physical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/384021
    Collection
    • Journal articles

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