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Investigation of the Onset of Heat Transfer Deterioration to Supercritical Water
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2009 (English)In: Proceedings of the 4th International Symposium on Supercritical Water-Cooled Reactors, 2009Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the onset of heat transfer deterioration (HTD) is evaluated from anexisting experimental database and also predicted using the Computational Fluid Dynamics(CFD) approach. The purpose of the analysis is to investigate the influence of variousparameters on the onset of HTD. Even though the experimental database with supercriticalwater heat transfer is quite extensive (over 14 000 data points are available to the presentauthors), the number of cases with a clear onset of HTD is quite limited. Thus, selectedHTD cases have been used for validation of the CFD models. The models havebeen next applied to investigate the influence of various parameters on the onset of HTD.Two types of the HTD have been noted in the numerical predictions: the buoyancy-drivenHTD, when M-shaped velocity profile appears in the channel cross-section, and the thermal-conductivity-driven HTD, when a thin “vapour” layer is created along the heated wall.The first type of HTD occurs for low Reynolds numbers, but it transits into the second type,when the Reynolds number increases.

Place, publisher, year, edition, pages
2009.
Keyword [en]
heat transfer deterioration, super-critical fluids
National Category
Energy Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-81599OAI: oai:DiVA.org:kth-81599DiVA: diva2:497654
Conference
4th International Symposium on Supercritical Water-Cooled Reactors. Heidelberg, Germany. March 8-11, 2009
Funder
StandUp
Note
QC 20120426Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-04-26Bibliographically approved

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Anglart, Henryk

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