Condensing flow

Promising results for adiabatic flows encouraged to extent the HZDR baseline model(1) for other conditions, for example, with phase change(2), chemical reaction(3), as well as material systems other than air-water , e. g. Argon-GaInSn(4). In the present work, it is applied for condensing steam-water flows inside a large vertical pipe.

Figure 1 shows the simulated steam distribution during its condensation in sub-cooled water under different pressure p, inlet sub-cooling degree ΔT as well as orifice size rorifice.

Modelling of interphase heat transfer coefficient is another active research topic. Figure 2 show the evolution of steam volume fraction along the pipe obtained by using the Tomiyam and the Ranz-Marshall correlations.

The poly-disperse iMUSIG-approach(5) is used to capture the change of Sauter mean diameter of steam bubbles at condensation.

Selected publications

  • Liao, Y., Lucas, D.
    Poly-disperse simulation of condensing steam-water flow inside a large vertical pipe.
    International Journal of Thermal Sciences, 104, 194-207
  • Liao, Y., et al.
    Application of new closure models for bubble coalescence and breakup to steam-water vertical pipe flow.
    Nucl. Eng. Des., 279, 126-136
  • Liao, Y. et al.
    Interfacial heat transfer models for flashing flows: a review.
    13th international conference Multiphase Flow in Industrial Plant, Sept.17-19, Genova, Italy
  • Liao, Y., et al.
    New coalescence and breakup kernels for air-water and steam-water pipe flows.
    5th Population Balance Modeling Conference (PBM2013), Bangalore, Indian, Sept. 11-13
  • Lucas, D.; Frank, T.; Lifante, C.; Zwart, P.; Burns, A.
    Extension of the inhomogeneous MUSIG model for bubble condensation.
    Nucl. Eng. Des., 24, 4359-4367
  • Krepper, E.; Beyer, M.; Lucas, D.; Schmidtke, M.
    A population balance approach considering heat and mass transfer e experiments and CFD simulations.
    Nucl. Eng. Des., 241, 2889-2897
  • Lucas, D.; Prasser, H.-M.
    Steam bubble condensation in sub-cooled water in case of co-current vertical pipe flow.
    Nucl. Eng. Des., 237, 497-508

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Dr. Yixiang Liao
Computational Fluid Dynamics
Phone: +49 351 260 2389

Dr. Eckhard Krepper
Computational Fluid Dynamics
Phone: +49 351 260 2067
Fax: +49 351 260 12067

Dr. Dirk Lucas
Head Computational Fluid Dynamics
Phone: +49 351 260 2047
Fax: +49 351 260 12047

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