Extending thermal-hydraulic modelling capabilities of Apros into coiled geometries

Joona Leskinen (Corresponding Author), Jaakko Ylätalo, Roberto Pettini

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    In this work we extend modelling capabilities of the Apros two-fluid thermal hydraulic model into coiled geometries by re-defining the existing closure laws with new correlations valid in coiled tubes. The purpose is to be able to accurately model helically coiled steam generators, often adoped by small modular reactors (SMRs). For that, we identify suitable correlations and implement them into Apros. We also seek to identify areas which can already be accurately described with the existing models and, on the other hand, areas in which further experimental efforts are required for development of more accurate methods. Further, based on open literature, we compile a data base of experimental data for validation and verification purposes. We use the compiled data base for improving the accuracy of some of our calculation models. Specifically, we propose a modified version of an existing correlation for predicting the first dryout quality in helically coiled tubes. The proposed correlation is capable of estimating the first dryout quality with a reasonable accuracy in a range of state parameters and curvature ratios in which helically coiled steam generators generally operate.

    Original languageEnglish
    Article number110429
    JournalNuclear Engineering and Design
    Volume357
    DOIs
    Publication statusPublished - Feb 2020
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    hydraulics
    Hydraulics
    Steam generators
    geometry
    Geometry
    data bases
    boilers
    modeling
    closure law
    Hydraulic models
    tubes
    curvature
    estimating
    Fluids
    reactors
    fluid
    Hot Temperature
    fluids
    data base
    steam generator

    Keywords

    • Dryout
    • Heat transfer
    • Helical coils
    • SMR
    • Steam generator
    • Wall friction

    Cite this

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    abstract = "In this work we extend modelling capabilities of the Apros two-fluid thermal hydraulic model into coiled geometries by re-defining the existing closure laws with new correlations valid in coiled tubes. The purpose is to be able to accurately model helically coiled steam generators, often adoped by small modular reactors (SMRs). For that, we identify suitable correlations and implement them into Apros. We also seek to identify areas which can already be accurately described with the existing models and, on the other hand, areas in which further experimental efforts are required for development of more accurate methods. Further, based on open literature, we compile a data base of experimental data for validation and verification purposes. We use the compiled data base for improving the accuracy of some of our calculation models. Specifically, we propose a modified version of an existing correlation for predicting the first dryout quality in helically coiled tubes. The proposed correlation is capable of estimating the first dryout quality with a reasonable accuracy in a range of state parameters and curvature ratios in which helically coiled steam generators generally operate.",
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    Extending thermal-hydraulic modelling capabilities of Apros into coiled geometries. / Leskinen, Joona (Corresponding Author); Ylätalo, Jaakko; Pettini, Roberto.

    In: Nuclear Engineering and Design, Vol. 357, 110429, 02.2020.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Ylätalo, Jaakko

    AU - Pettini, Roberto

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    AB - In this work we extend modelling capabilities of the Apros two-fluid thermal hydraulic model into coiled geometries by re-defining the existing closure laws with new correlations valid in coiled tubes. The purpose is to be able to accurately model helically coiled steam generators, often adoped by small modular reactors (SMRs). For that, we identify suitable correlations and implement them into Apros. We also seek to identify areas which can already be accurately described with the existing models and, on the other hand, areas in which further experimental efforts are required for development of more accurate methods. Further, based on open literature, we compile a data base of experimental data for validation and verification purposes. We use the compiled data base for improving the accuracy of some of our calculation models. Specifically, we propose a modified version of an existing correlation for predicting the first dryout quality in helically coiled tubes. The proposed correlation is capable of estimating the first dryout quality with a reasonable accuracy in a range of state parameters and curvature ratios in which helically coiled steam generators generally operate.

    KW - Dryout

    KW - Heat transfer

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    KW - Wall friction

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