Experiments in cap-bubbly two-phase flows for two-group IATE development

T. Worosz, S. Kim

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    In the two-group interfacial area transport equation (IATE) used to calculate the interfacial area concentration, ai bubbles are categorized into two groups. Namely, group-I consists of spherical/distorted bubbles, and group-II consists of cap/slug/churn-turbulent bubbles. Robust models for the major bubble interaction mechanisms that cause the transition from purely onegroup to two-group flows are essential to the dynamic closure of the two-fluid model with the two-group IATE. Therefore, the present study seeks to establish an experimental database in capbubbly flows that highlights this transition to support model development. A four-sensor conductivity probe is used to obtain measurements of local time-averaged two-phase flow parameters, including the void fraction and ai in vertical-upward air-water two-phase flow in a 5.08cm pipe. Four flow conditions are investigated at <jf>=2m/s with increasing <jg> to study the generation and growth of group-II bubbles. Characteristic features of the local void fraction and ai distributions are discussed. Additionally, axial development of area-averaged void fraction and ai that is indicative of exchange between the bubble groups is presented.

    Original languageEnglish (US)
    Title of host publicationEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
    PublisherAmerican Nuclear Society
    Pages302-314
    Number of pages13
    ISBN (Electronic)9781632668509
    StatePublished - Jan 1 2014
    EventEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting - Reno, United States
    Duration: Jun 15 2014Jun 19 2014

    Publication series

    NameEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting

    Other

    OtherEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
    CountryUnited States
    CityReno
    Period6/15/146/19/14

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Geotechnical Engineering and Engineering Geology
    • Nuclear Energy and Engineering

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