| Title: | Benchmark DEBORA : Assessment of MCFD compared to high-pressure boiling pipe flow measurements |
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| Authors: | ID Bois, Guillaume (Author)
ID Fillion, P. (Author)
ID Burlot, Alan (Author)
ID Ben Hadj Ali, A. (Author)
ID Khaware, A. (Author)
ID Sanyal, J. (Author)
ID Rehm, M. (Author)
ID Farges, B. (Author)
ID Gajšek, Aljoša, Institut "Jožef Stefan" (Author)
ID Tekavčič, Matej, Institut "Jožef Stefan" (Author)
ID Končar, Boštjan, Institut "Jožef Stefan" (Author) |
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| Files: |  PDF - Presentation file, download (2,59 MB)
MD5: 61E3156EDE22BB11BD790792FFA25505
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | A benchmark activity on two-fluid simulations of high-pressure boiling upward flows in a pipe is performed by 12 participants using different MCFD (Multiphase Computational Fluid Dynamics) codes and closure relationships. More than 30 conditions from DEBORA experiment conducted by CEA are considered. Each case is characterised by the flow rate, inlet temperature, wall heat flux and outlet pressure. High-pressure Freon (R12) at 14 bar and 26 bar is boiled in a 19.2 mm pipe heated over 3.5 m. Flow rates range from 2000 kg m−2 s −1 to 5000 kg m−2 s −1 and exit quality � ranges from single-phase conditions to � = 0.1 which leads to a peak void fraction of � = 70%. In these high pressure conditions, bubbles remain small and there is no departure from the bubbly flow regime (François et al., 2011; Hösler, 1968). However, different kind of bubbly flows are observed: wall-peak, intermediate peak or core-peak, depending on the case considered. Measurements along the pipe radius near the end of the heated section are compared to code predictions. They include void fraction, bubble mean diameter, vapour velocity and liquid temperature. The benchmark covered two phases. In the first phase of the benchmark activities, experimental data were given to the participants, allowing to compare the simulation results and to develop, to select or to adjust the models in the CMFD codes. The second phase included blind cases where the participants could not compare to the measurements. In between the two phases, possible additional model adjustments or calibrations were performed. Overall, the benchmark involved very different closures and a wide range of models’ complexity was covered. Yet, it is extremely difficult to have a robust closure for all conditions considered, even knowing experimental measurements. The wall-to-core peak transition is not captured consistently by the models. The degree of subcooling and the void fraction level are also difficult to assess |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 31.01.2024 |
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| Article acceptance date: | 18.07.2024 |
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| Publication date: | 30.07.2024 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2024 |
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| Number of pages: | 31 str. |
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| Numbering: | Vol. 179, Art. 104920 |
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| Source: | Nizozemska |
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| PID: | 20.500.12556/DiRROS-21785  |
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| UDC: | 621.039 |
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| ISSN on article: | 0301-9322 |
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| DOI: | 10.1016/j.ijmultiphaseflow.2024.104920 |
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| COBISS.SI-ID: | 203717635 |
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| Copyright: | © 2024 The Author(s). |
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| Publication date in DiRROS: | 28.03.2025 |
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| Views: | 99 |
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| Downloads: | 60 |
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| Metadata: |    |
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BOIS, Guillaume, FILLION, P., BURLOT, Alan, BEN HADJ ALI, A., KHAWARE, A., SANYAL, J., REHM, M., FARGES, B., GAJŠEK, Aljoša, TEKAVČIČ, Matej and KONČAR, Boštjan, 2024, Benchmark DEBORA : Assessment of MCFD compared to high-pressure boiling pipe flow measurements. International journal of multiphase flow [online]. 2024. Vol. 179, no. 104920. [Accessed 4 April 2025]. DOI 10.1016/j.ijmultiphaseflow.2024.104920. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=21785
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