Local liquid velocity measurements in air-water bubbly flow

X. Sun, S. Kim, T. R. Smith, M. Ishii

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Local measurements of axial liquid velocity were performed for vertical upward air-water bubbly flow in a 101.6-mm inner-diameter round pipe by using a laser Doppler anemometer (LDA) and a hot-film anemometer (HFA). The data reduction approaches for both the LDA and HFA are discussed in detail. A threshold scheme with the information of local void fraction and velocity distribution in single-phase flow was applied to the LDA to approximately discriminate liquid velocity signals from those of the bubble interface velocity. Furthermore, a formulation was given to account for the effect of the bubble relative velocity on the liquid in the front and wake regions of the bubbles. For the HFA, an amplitude threshold scheme and a slope criterion were used to extract liquid velocity information. To reduce the measurement uncertainty, the experiments were performed in flow conditions where the area-averaged void fraction was less than 20%. The experimental results showed satisfactory agreement between the liquid volumetric flow rates calculated by area integration of the local liquid velocity and void fraction measurements, and the measured value by a magnetic flow meter. Also, the area-averaged relative velocity between the gas and liquid phases obtained from the current measurements agreed well with previous research.

    Original languageEnglish (US)
    Pages (from-to)653-662
    Number of pages10
    JournalExperiments in Fluids
    Volume33
    Issue number5
    DOIs
    StatePublished - Nov 2002

    Fingerprint

    water flow
    velocity measurement
    Anemometers
    Velocity measurement
    hot-film anemometers
    Water
    air
    Liquids
    anemometers
    liquids
    Air
    Void fraction
    voids
    bubbles
    Bubbles (in fluids)
    Lasers
    single-phase flow
    lasers
    thresholds
    data reduction

    All Science Journal Classification (ASJC) codes

    • Computational Mechanics
    • Mechanics of Materials
    • Physics and Astronomy(all)
    • Fluid Flow and Transfer Processes

    Cite this

    Sun, X. ; Kim, S. ; Smith, T. R. ; Ishii, M. / Local liquid velocity measurements in air-water bubbly flow. In: Experiments in Fluids. 2002 ; Vol. 33, No. 5. pp. 653-662.
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    Local liquid velocity measurements in air-water bubbly flow. / Sun, X.; Kim, S.; Smith, T. R.; Ishii, M.

    In: Experiments in Fluids, Vol. 33, No. 5, 11.2002, p. 653-662.

    Research output: Contribution to journalArticle

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