Annular flow stability within small-sized channels

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    An analytical study based on a variational thermodynamic principle is presented to evaluate the influence of surface tension on the stability of annular flow within small-sized channels. The model introduces phenomenological assumptions in the interfacial structure of the flow regime and theoretically draws the equilibrium transition line from an annular regime to the initiation of the partial wetting condition on the inner surface. By including surface tension, this model expands previous theories and identifies the stable flow configuration in terms of void fraction and interfacial extension. The significant influence of a higher surface tension and smaller diameter (i.e. lower Weber number) are responsible for a lower stable void fraction and higher slip ratio. A complete screening of the main influential parameters is conducted to explore the descriptive ability of the model. This analysis aims at contributing to the understanding of the stability of two-phase flow regimes and can be extended to the transition between other neighbouring regimes, including wall friction as well as liquid entrainment phenomena.

    Original languageEnglish
    Pages (from-to)1153-1162
    Number of pages10
    JournalInternational Journal of Heat and Mass Transfer
    Volume116
    DOIs
    Publication statusPublished - 2018 Jan 1

    Fingerprint

    annular flow
    flow stability
    Surface tension
    interfacial tension
    Void fraction
    voids
    entrainment
    two phase flow
    Two phase flow
    wetting
    Wetting
    Screening
    slip
    friction
    screening
    Thermodynamics
    Friction
    thermodynamics
    Liquids
    liquids

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

    Cite this

    Annular flow stability within small-sized channels. / Giannetti, Niccolo; Kunita, Daisuke; Yamaguchi, Seiichi; Saito, Kiyoshi.

    In: International Journal of Heat and Mass Transfer, Vol. 116, 01.01.2018, p. 1153-1162.

    Research output: Contribution to journalArticle

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