Algebraic turbulence modeling in adiabatic and evaporating annular two-phase flow

Andrea Cioncolini, John R. Thome

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The study considers algebraic turbulence modeling in adiabatic and evaporating annular two-phase flow, focusing in particular on momentum and heat transfer (so-called 'convective boiling') through the annular liquid film. In contrast with single-phase wall-bounded flow theory, shear-driven annular liquid films are assumed here to behave as fluid-bounded flows, mostly interacting with the shearing gas-entrained droplets core flow. Besides providing velocity and temperature profiles through the liquid film, the turbulence model proposed here predicts key parameters such as the average liquid film thickness, the void fraction and the convective boiling heat transfer coefficient with accuracies comparable or better than those of leading design correlations. This turbulence model is part of a unified annular flow modeling suite that includes methods to predict the entrained liquid fraction and the axial frictional pressure gradient. The underlying heat transfer database covers nine fluids (water, two hydrocarbons and six refrigerants) for vertical and horizontal tubes of 1.03-14.4. mm diameter and pressures of 0.1-7.2. MPa. Importantly, this study shows that there appears to be no macro-to-microscale transition when it comes to annular flow. Simply better physical modeling is required to span this range. © 2011 Elsevier Inc.
    Original languageEnglish
    Pages (from-to)805-817
    Number of pages12
    JournalInternational Journal of Heat and Fluid Flow
    Volume32
    Issue number4
    DOIs
    Publication statusPublished - Aug 2011

    Keywords

    • Algebraic turbulence modeling
    • Annular two-phase flow
    • Convective boiling heat transfer
    • Macroscale
    • Microscale
    • Shear-driven liquid film

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