Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels

Horst Michael Prasser, Christian Bolesch, Kerstin Cramer, Daisuke Ito, Petros Papadopoulos, Abhishek Saxena, Robert Zboray

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    An overview is given on the work of the Laboratory of Nuclear Energy Systems at ETH, Zurich (ETHZ) and of the Laboratory of Thermal Hydraulics at Paul Scherrer Institute (PSI), Switzerland on tight-lattice bundles. Two-phase flow in subchannels of a tight triangular lattice was studied experimentally and by computational fluid dynamics simulations. Two adiabatic facilities were used: (1) a vertical channel modeling a pair of neighboring subchannels; and (2) an arrangement of four subchannels with one subchannel in the center. The first geometry was equipped with two electrical film sensors placed on opposing rod surfaces forming the subchannel gap. They recorded 2D liquid film thickness distributions on a domain of 16 × 64 measuring points each, with a time resolution of 10 kHz. In the bubbly and slug flow regime, information on the bubble size, shape, and velocity and the residual liquid film thickness underneath the bubbles were obtained. The second channel was investigated using cold neutron tomography, which allowed the measurement of average liquid film profiles showing the effect of spacer grids with vanes. The results were reproduced by large eddy simulation + volume of fluid. In the outlook, a novel nonadiabatic subchannel experiment is introduced that can be driven to steady-state dryout. A refrigerant is heated by a heavy water circuit, which allows the application of cold neutron tomography.

    Original languageEnglish (US)
    Pages (from-to)847-858
    Number of pages12
    JournalNuclear Engineering and Technology
    Volume48
    Issue number4
    DOIs
    StatePublished - Aug 1 2016

    Fingerprint

    Liquid films
    Two phase flow
    Tomography
    Film thickness
    Neutrons
    Heavy water
    Large eddy simulation
    Refrigerants
    Bubbles (in fluids)
    Nuclear energy
    Computational fluid dynamics
    Hydraulics
    Fluids
    Geometry
    Networks (circuits)
    Sensors
    Computer simulation
    Experiments

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering

    Cite this

    Prasser, H. M., Bolesch, C., Cramer, K., Ito, D., Papadopoulos, P., Saxena, A., & Zboray, R. (2016). Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels. Nuclear Engineering and Technology, 48(4), 847-858. https://doi.org/10.1016/j.net.2016.06.007
    Prasser, Horst Michael ; Bolesch, Christian ; Cramer, Kerstin ; Ito, Daisuke ; Papadopoulos, Petros ; Saxena, Abhishek ; Zboray, Robert. / Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels. In: Nuclear Engineering and Technology. 2016 ; Vol. 48, No. 4. pp. 847-858.
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    Prasser, HM, Bolesch, C, Cramer, K, Ito, D, Papadopoulos, P, Saxena, A & Zboray, R 2016, 'Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels', Nuclear Engineering and Technology, vol. 48, no. 4, pp. 847-858. https://doi.org/10.1016/j.net.2016.06.007

    Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels. / Prasser, Horst Michael; Bolesch, Christian; Cramer, Kerstin; Ito, Daisuke; Papadopoulos, Petros; Saxena, Abhishek; Zboray, Robert.

    In: Nuclear Engineering and Technology, Vol. 48, No. 4, 01.08.2016, p. 847-858.

    Research output: Contribution to journalArticle

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    Prasser HM, Bolesch C, Cramer K, Ito D, Papadopoulos P, Saxena A et al. Bubbly, Slug, and Annular Two-Phase Flow in Tight-Lattice Subchannels. Nuclear Engineering and Technology. 2016 Aug 1;48(4):847-858. https://doi.org/10.1016/j.net.2016.06.007