Volume 8, Issue 4 (April 2011)

    Modeling Vertical Subcooled Boiling Flows at Low Pressures

    (Received 14 September 2010; accepted 16 March 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    An improved wall heat flux partitioning model at the heated surface was developed by Yeoh This model, coupled with a three-dimensional two-fluid model and Multiple Size Group model, has led to satisfactory agreement being achieved between the model predictions and experimental measurements. Nevertheless, one shortcoming is the reliance on empirical correlations for the active nucleation site density in the wall heat flux partitioning model. This discrepancy brings about uncertainties, especially in appropriately evaluating the vapor generation rate, which greatly influences the model prediction on the axial and radial void fraction profiles within the bulk fluid flow. By considering the fractal model with the aforementioned subcooled boiling flow model in the absence of empirical correlations for the active nucleation site density, a comprehensive mechanistic model to predict vertically oriented subcooled boiling flows is developed. The proposed model is assessed against the experimental data of axial measurements of Zeitoun and Shoukri and the radial measurements of Yun and Lee for vertical subcooled boiling flows within annular channels. Improved model predictions are obtained when the model is compared against typically applied empirical correlations for active nucleation site density. Discussions on the agreement of other two-phase flow parameters are also presented.


    Author Information:

    Yeoh, G. H.
    Associate Professor, Australian Nuclear Science and Technology Organisation (ANSTO), Kirrawee DC, New South Wales

    School of Mechanical and Manufacturing Engineering, Univ. of NSW, New South Wales

    Cheung, S. C. P.
    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT Univ., Victoria

    Tu, J. Y.
    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT Univ., Victoria

    Ho, M. K. M
    Australian Nuclear Science and Technology Organisation (ANSTO), Kirrawee DC, New South Wales


    Stock #: JAI103374

    ISSN: 1546-962X

    DOI: 10.1520/JAI103374

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    Author
    Title Modeling Vertical Subcooled Boiling Flows at Low Pressures
    Symposium , 0000-00-00
    Committee E10