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NUMERICAL AND EXPERIMENTAL CAMPAIGNS FOR LEAD SOLIDIFICATION MODELING AND TESTING (under review)

Manuela Profir, Vincent Moreau, Tomas Melichar
Nuclear Engineering and Design - 2019
Download the publication : Paper_LeadSolidification_FinalVersion.pdf [6.9Mo]  
The file provided is the preprint submitted to the journal. The Computational Fluid-Dynamics (CFD) modelling of Heavy Liquid Metal (HLM) flows in pool configuration is investigated in the framework of the SESAME project. This paper focuses on the strong coupling between numerical simulations and experimental activity with the objective to make CFD a valid tool in support to the design of safe and innovative Gen-IV nuclear plants. The attention is focused on the possible occurrence of lead solidification phenomena with the aim to demonstrate that the overall modeling of HLM complex systems can include solidification phenomenology by reproducing small/medium scale experiment, making comparison with experimental results, improving the numerical setting (post-test), evaluate time scales, limitations and computational costs. A dedicated experimental campaign on the SESAME-Stand facility has been performed by the Research Centre Rez (CVR), heavily relying on the use of CFD support, with the specific objective to build a series of datasets suited also for the CFD modelling validation. The numerical simulations of the SESAME-Stand experimental facility have been performed in STAR-CCM+. The model uses liquid lead as working fluid in the pool and air in the cooling channel. Increasing the mass flow rate in the cooling air channel, the solidification procedure is initiated and the freezing front propagates in the pool until reaching an internal obstacle. The numerical issues encountered during the pre-test simulations have been fully overcome by means of systematic investigations and all the improvements have been successfully applied in the post-test model. A decisive modelling aspect was the correct implementation of the thermal radiation which plays an important role in the cooling process. The numerical model allowed to reach an increased number of initial steady states and accessible transients, according to the experimental matrix. The comparison with the experimental results shows similar temperature configuration and comparable frozen fractions in the steady state cases and excellent agreement in the fast transient solidification-remelting cases.

BibTex references

@Article{PMM19,
  author       = {Profir, M. and Moreau, V. and Melichar, T.},
  title        = {NUMERICAL AND EXPERIMENTAL CAMPAIGNS FOR LEAD SOLIDIFICATION MODELING AND TESTING (under review)},
  journal      = {Nuclear Engineering and Design},
  year         = {2019},
  keywords     = {CFD, thermal hydraulics, lead solidification},
  url          = {http://publications.crs4.it/pubdocs/2019/PMM19},
}

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» Manuela Profir
» Vincent Moreau
» Tomas Melichar