Capillary instability, squeezing, and shearing in head-on microfluidic devices

    Research output: Contribution to journalArticleAcademicpeer-review

    14 Citations (Scopus)

    Abstract

    We investigate two-phase (oil and water) flow in head-on microfluidic devices, which consist of two identical channels as inlets and the "long leg" as a constriction channel leading to a wider outlet section. Over an exceptionally broad range of flow rates of 10(-4)-10 mu l/min in 10-100 mu m (hydraulic diameter) microchannels, corresponding to capillary numbers of 10(-6)-10(-1), a two-phase flow map is presented. A rich flow behavior was found. The flow patterns observed were dripping, jetting, and threading. These phenomena are interpreted as caused by capillary instability, squeezing, and shearing by considering the contribution of different forces acting at the oil/water interface. This device provides us with a broad choice to generate droplets of different sizes and frequencies by modifying either the geometrical design or the flow rates.
    Original languageUndefined
    Article number10.1063/1.3268364
    Pages (from-to)124305
    Number of pages7
    JournalJournal of applied physics
    Volume106
    Issue number12
    DOIs
    Publication statusPublished - 2009

    Keywords

    • EWI-17172
    • droplet formation
    • polygonal capillaries
    • flow-rate
    • channels
    • junction
    • IR-69586
    • pressure
    • Long bubbles
    • Transition
    • Viscosity
    • METIS-264468
    • thermocapillary migration

    Cite this

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    title = "Capillary instability, squeezing, and shearing in head-on microfluidic devices",
    abstract = "We investigate two-phase (oil and water) flow in head-on microfluidic devices, which consist of two identical channels as inlets and the {"}long leg{"} as a constriction channel leading to a wider outlet section. Over an exceptionally broad range of flow rates of 10(-4)-10 mu l/min in 10-100 mu m (hydraulic diameter) microchannels, corresponding to capillary numbers of 10(-6)-10(-1), a two-phase flow map is presented. A rich flow behavior was found. The flow patterns observed were dripping, jetting, and threading. These phenomena are interpreted as caused by capillary instability, squeezing, and shearing by considering the contribution of different forces acting at the oil/water interface. This device provides us with a broad choice to generate droplets of different sizes and frequencies by modifying either the geometrical design or the flow rates.",
    keywords = "EWI-17172, droplet formation, polygonal capillaries, flow-rate, channels, junction, IR-69586, pressure, Long bubbles, Transition, Viscosity, METIS-264468, thermocapillary migration",
    author = "Lingling Shui and {van den Berg}, Albert and Eijkel, {Jan C.T.}",
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    year = "2009",
    doi = "10.1063/1.3268364",
    language = "Undefined",
    volume = "106",
    pages = "124305",
    journal = "Journal of applied physics",
    issn = "0021-8979",
    publisher = "American Institute of Physics",
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    Capillary instability, squeezing, and shearing in head-on microfluidic devices. / Shui, Lingling; van den Berg, Albert; Eijkel, Jan C.T.

    In: Journal of applied physics, Vol. 106, No. 12, 10.1063/1.3268364, 2009, p. 124305.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Capillary instability, squeezing, and shearing in head-on microfluidic devices

    AU - Shui, Lingling

    AU - van den Berg, Albert

    AU - Eijkel, Jan C.T.

    N1 - 10.1063/1.3268364

    PY - 2009

    Y1 - 2009

    N2 - We investigate two-phase (oil and water) flow in head-on microfluidic devices, which consist of two identical channels as inlets and the "long leg" as a constriction channel leading to a wider outlet section. Over an exceptionally broad range of flow rates of 10(-4)-10 mu l/min in 10-100 mu m (hydraulic diameter) microchannels, corresponding to capillary numbers of 10(-6)-10(-1), a two-phase flow map is presented. A rich flow behavior was found. The flow patterns observed were dripping, jetting, and threading. These phenomena are interpreted as caused by capillary instability, squeezing, and shearing by considering the contribution of different forces acting at the oil/water interface. This device provides us with a broad choice to generate droplets of different sizes and frequencies by modifying either the geometrical design or the flow rates.

    AB - We investigate two-phase (oil and water) flow in head-on microfluidic devices, which consist of two identical channels as inlets and the "long leg" as a constriction channel leading to a wider outlet section. Over an exceptionally broad range of flow rates of 10(-4)-10 mu l/min in 10-100 mu m (hydraulic diameter) microchannels, corresponding to capillary numbers of 10(-6)-10(-1), a two-phase flow map is presented. A rich flow behavior was found. The flow patterns observed were dripping, jetting, and threading. These phenomena are interpreted as caused by capillary instability, squeezing, and shearing by considering the contribution of different forces acting at the oil/water interface. This device provides us with a broad choice to generate droplets of different sizes and frequencies by modifying either the geometrical design or the flow rates.

    KW - EWI-17172

    KW - droplet formation

    KW - polygonal capillaries

    KW - flow-rate

    KW - channels

    KW - junction

    KW - IR-69586

    KW - pressure

    KW - Long bubbles

    KW - Transition

    KW - Viscosity

    KW - METIS-264468

    KW - thermocapillary migration

    U2 - 10.1063/1.3268364

    DO - 10.1063/1.3268364

    M3 - Article

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