Experiments and modeling in bubbly flows at elevated pressures

    Authors

    R. Kumar; T. A. Trabold;C. C. Maneri

    Comments

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    Abbreviated Journal Title

    J. Fluids Eng.-Trans. ASME

    Keywords

    ANNULAR 2-PHASE FLOW; PREDICTION; FRACTION; CHANNEL; DROPLET; SPHERE; LIFT; Engineering, Mechanical

    Abstract

    Measurements of local void fraction, rise velocity, and bubble diameter have been obtained for cocurrent, wall-heated, upward bubbly flows in a pressurized refrigerant. The instrumentation used are the gamma densitometer and the hot-film anemometer Departure bubble size is correlated in terms of liquid subcooling and bulk bubble size in terms of void fraction. Flow visualization techniques have also been used to understand the two-phase flow structure and the behavior of the bubbly flow for different bubble shapes and sizes, and to obtain the bubble diameter and rise velocity. The lift model is provided explicitly in terms of Eotvos number which is changed by changing the system pressure. In general, Eotvos number plays a strong role in determining both bubbly lift and drag. Such insight coupled with quantitative local and averaged data on void fraction and bubble size at different pressures has aided in developing bubbly flow models applicable to heated two-phase flows at high pressure.

    Journal Title

    Journal of Fluids Engineering-Transactions of the Asme

    Volume

    125

    Issue/Number

    3

    Publication Date

    1-1-2003

    Document Type

    Article

    Language

    English

    First Page

    469

    Last Page

    478

    WOS Identifier

    WOS:000183646900008

    ISSN

    0098-2202

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