Trace with dynamic model for interfacial area concentration prediction

Justin D. Talley, Seungjin Kim, John Mahaffy, Stephen M. Bajorek, Kirk Tien

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Scopus citations

    Abstract

    The present study implements the one-dimensional interfacial area transport equation into the TRACE being developed by the U.S. NRC This transport equation replaces the conventional flow regime dependent correlations and regime transition criteria for furnishing the interfacial area concentration in the two-fluid model by mechanistically modeling bubble coalescence and disintegration. This dynamic method eliminates potential artificial bifurcations or numerical oscillations stemming from the use of conventional static correlations. To implement the interfacial area transport equation, a three-field version of TRACE that can track a dispersed gas field is utilized. For simplicity, only adiabatic two-phase flow conditions are considered, and the interfacial area sources or sinks due to phase change phenomena are ignored. Data obtained from two vertical co-current upward air-water experiments performed in round pipes (25.4 mm and 48.3 mm) are used to help evaluate the implementation. In the experiments, local values of void fraction, interfacial area concentration (ai), and bubble velocity measured with a multi-sensor conductivity probe are area-averaged to generate one-dimensional transport data. Results obtained from TRACE with and without the one-group interfacial area transport equation are compared to demonstrate the enhancement in prediction accuracy. It is found that predictions made by TRACE without interfacial area transport tend to underestimate ai,-. Moreover, it is found that while TRACE without interfacial area transport generally does well at predicting the axial trend of ai, it cannot predict non-linear axial increases found in several of the flow conditions. In total, 18 different flow conditions are evaluated using TRACE with the one-group interfacial area transport equation, with an average error to the ai, experimental data of approximately ±8%.

    Original languageEnglish (US)
    Title of host publicationInternational Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
    Pages1416-1426
    Number of pages11
    StatePublished - Sep 7 2010
    EventInternational Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010 - San Diego, CA, United States
    Duration: Jun 13 2010Jun 17 2010

    Publication series

    NameInternational Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
    Volume2

    Other

    OtherInternational Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
    CountryUnited States
    CitySan Diego, CA
    Period6/13/106/17/10

    All Science Journal Classification (ASJC) codes

    • Energy Engineering and Power Technology
    • Nuclear Energy and Engineering

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