An Experimental and Theoretical Investigation of Inverse Annular Film Flow and Dispersed Droplet Flow important under LOCA Conditions. 1980

Per Ottosen

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    Abstract

    The flow regimes inverse annular film flow and the change to dispersed droplet flow have been studied through measurements of void fraction and heat flux. Equipment for measuring the mean void fraction by the Y-ray absorption method has been developed. Measurements are presented of the axial void fraction distribution, the low flow inverse film boiling heat transfer, and the heat transfer to the dispersed droplet flow. The experiments were performed in a heated glass tube with a nitrogen gas-liquid two-phase flow at 1 bar. The inlet mass flux was varied through a 10 to 120 kg/nfs range. Furthermore, a few measurements are presented of void fraction during inside reflood of a single heated steel tube with water. The experimental data from the series of experiments using nitrogen as coolant have been compared with calculations with the onediemnsional, six-equation computer code RISQUE-N2.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages150
    ISBN (Print)87-550-0689-2
    Publication statusPublished - 1982
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number424
    ISSN0106-2840

    Keywords

    • Risø-R-424

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