Annular Flow: A mechanistic suite of co-validated methods for two-phase flow and boiling/condensation heat transfer

Andrea Cioncolini, John R. Thome

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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    The present paper focuses on the unified modeling suite for
    annular flow that the authors have been developing in the last
    few years. Annular two-phase flow is one of the most important
    of the gas-liquid two-phase flow regimes because of the large
    range of industrial applications in which it occurs, such as
    refrigeration and air conditioning systems, nuclear reactors and
    chemical processing plants, and high heat flux cooling
    applications. Sound design and safe operation of two-phase
    flow systems require accurate modelling of annular flows, and
    this motivated the development of the mechanistic modelling
    suite for annular two-phase flows that is discussed here. First,
    the unified suite of annular flow prediction methods is
    presented, illustrating in particular the most recent updates.
    Then, selected results for convective evaporation and
    condensation in tubes and channels are presented and
    discussed. Presently, the annular flow suite includes prediction
    methods for the void fraction, the entrained liquid fraction, the
    pressure gradient, and a turbulence model for momentum and
    heat transport inside the annular liquid film. This turbulence
    model, in particular, allows prediction of the local average
    liquid film thicknesses and the local heat transfer coefficients
    during convective evaporation and condensation. The benefit of
    a unified modeling suite is that all the included prediction
    methods are consistently formulated and are proven to work
    well together, and provide a platform for continued
    advancement based on the other models in the suite.
    Original languageEnglish
    Title of host publicationHEFAT 2016: 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics
    Publication statusPublished - 1 Jun 2016


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