A numerical study of heat transfer to supercritical water flowing upward in vertical tubes under normal and deteriorated conditions
2013 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 264, 61-70 p.Article in journal (Refereed) Published
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.
Supercritical water, Heat transfer deterioration, Variable properties, Sensitivity analysis
IdentifiersURN: urn:nbn:se:kth:diva-136493DOI: 10.1016/j.nucengdes.2012.10.028ISI: 000326767400006ScopusID: 2-s2.0-84885064989OAI: oai:DiVA.org:kth-136493DiVA: diva2:677668
FunderEU, FP7, Seventh Framework Programme, 249337
QC 201312102013-12-102013-12-052013-12-10Bibliographically approved