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A numerical study of heat transfer to supercritical water flowing upward in vertical tubes under normal and deteriorated conditions
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2013 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 264, 61-70 p.Article in journal (Refereed) Published
Abstract [en]

A numerical study of heat transfer to supercritical water in vertical tubes is carried out using the ANSYS-CFX code and employing the k-omega SST turbulence model. The numerical results on wall temperature distributions under normal and deteriorated heat transfer conditions are compared with experimental data and a good agreement is obtained. The onset of deterioration is captured for both low-flow and high-flow conditions. Sensitivity of numerical results to operational conditions and the turbulent Prandtl number (Pr-t) is investigated. The grid independent solution is obtained when y(+) is less than 1 and the cell aspect ratio is less than 2000. It is concluded that the turbulent Prandtl number has a quite significant influence on the calculated wall temperature and the best agreement with experimental data is obtained when Pr-t is close to 0.9.

Place, publisher, year, edition, pages
2013. Vol. 264, 61-70 p.
Keyword [en]
Supercritical water, Heat transfer deterioration, Variable properties, Sensitivity analysis
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-136493DOI: 10.1016/j.nucengdes.2012.10.028ISI: 000326767400006Scopus ID: 2-s2.0-84885064989OAI: oai:DiVA.org:kth-136493DiVA: diva2:677668
Funder
EU, FP7, Seventh Framework Programme, 249337
Note

QC 20131210

Available from: 2013-12-10 Created: 2013-12-05 Last updated: 2017-12-06Bibliographically approved

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Anglart, Henryk

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