A comprehensive, mechanistic heat transfer modeling package for dispersed flow film boiling - Part 1 - Development

Michael J. Meholic, David L. Aumiller, Fan-bill B. Cheung

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Accurate predictions of Dispersed Flow Film Boiling (DFFB) heat transfer are necessary during both the blowdown and reflood portions of a Loss-of-Coolant-Accident to ensure the correct initial fuel rod temperature distribution for the beginning of the reflood phase and ultimately, determining the peak cladding temperature. Numerous correlative, phenomenological, and mechanistic DFFB heat transfer models have been published; however, most of these models make simplifying assumptions that adversely impact their accuracy or are too computationally intensive to implement into current reactor safety codes. A comprehensive, mechanistic heat transfer modeling package has been developed to account for the six interrelated heat transfer paths in DFFB. Highlights of the model include a Lagrangian subscale trajectory based dry contact heat transfer model and a novel method of determining the two-phase convective heat transfer enhancement due to dispersed droplets intermittently altering the local vapor temperature distribution.

    Original languageEnglish (US)
    Article number8378
    Pages (from-to)295-301
    Number of pages7
    JournalNuclear Engineering and Design
    Volume291
    DOIs
    StatePublished - Sep 1 2015

    Fingerprint

    film boiling
    Boiling liquids
    heat transfer
    Heat transfer
    modeling
    Temperature distribution
    temperature distribution
    reactor safety
    loss of coolant
    Codes (standards)
    Loss of coolant accidents
    convective heat transfer
    accidents
    Heat conduction
    temperature
    rods
    droplet
    Vapors
    accident
    Trajectories

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Nuclear Energy and Engineering
    • Materials Science(all)
    • Safety, Risk, Reliability and Quality
    • Waste Management and Disposal
    • Mechanical Engineering

    Cite this

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    abstract = "Accurate predictions of Dispersed Flow Film Boiling (DFFB) heat transfer are necessary during both the blowdown and reflood portions of a Loss-of-Coolant-Accident to ensure the correct initial fuel rod temperature distribution for the beginning of the reflood phase and ultimately, determining the peak cladding temperature. Numerous correlative, phenomenological, and mechanistic DFFB heat transfer models have been published; however, most of these models make simplifying assumptions that adversely impact their accuracy or are too computationally intensive to implement into current reactor safety codes. A comprehensive, mechanistic heat transfer modeling package has been developed to account for the six interrelated heat transfer paths in DFFB. Highlights of the model include a Lagrangian subscale trajectory based dry contact heat transfer model and a novel method of determining the two-phase convective heat transfer enhancement due to dispersed droplets intermittently altering the local vapor temperature distribution.",
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    A comprehensive, mechanistic heat transfer modeling package for dispersed flow film boiling - Part 1 - Development. / Meholic, Michael J.; Aumiller, David L.; Cheung, Fan-bill B.

    In: Nuclear Engineering and Design, Vol. 291, 8378, 01.09.2015, p. 295-301.

    Research output: Contribution to journalArticle

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