Characterization of the dissipation of elbow effects in bubbly two-phase flows

Mohan S. Yadav, Ted Worosz, Seungjin Kim, Kirk Tien, Stephen M. Bajorek

    Research output: Contribution to journalArticlepeer-review

    24 Scopus citations


    This study develops a method to characterize the elbow-region for vertical-upward-to-horizontal air-water bubbly two-phase flows through a 90° elbow with a non-dimensional centerline radius of curvature, RC/. D, of three. The dissipation of the elbow-effects in the horizontal region downstream of the elbow is characterized by the change in the local void fraction distribution. To quantify the dissipation characteristics, the elbow-strength, S, is defined as the inverse of the second moment of the local void fraction distribution. It is found that the elbow-strength decreases exponentially with increasing development length in the elbow-region. The slope of decrease of the elbow-strength in the elbow-region is determined by the dissipation parameter, β. The dissipation parameter determines the development length required for the elbow-effects on the two-phase flow parameters to become negligible. It is found that the dissipation parameter is a linear function of the mixture Reynolds number for the flow conditions investigated in the present study.

    Original languageEnglish (US)
    Pages (from-to)101-109
    Number of pages9
    JournalInternational Journal of Multiphase Flow
    StatePublished - Nov 2014

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • General Physics and Astronomy
    • Fluid Flow and Transfer Processes


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