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Numerical analysis of the onset of heat transfer deterioration to supercritical water
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2010 (English)In: International Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010: Volume 3, 2010, 1689-1695 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the mechanism of the onset of heat transfer deterioration to supercritical water is elucidated with detailed numerical predictions of flow and heat transfer in the boundary layer. It is shown that for low mass flow rates the buoyancy effects are dominant and the deterioration of heat transfer is caused by the turbulence damping in the vicinity of the heated wall. For high mass flow rates the mechanism of deterioration changes and the triggering factor is the decrease of the thermal conductivity of fluid in the viscous sub-layer. A numerical prediction of this phenomenon requires application of a low Reynolds number turbulence model with y+ less than 1.

Place, publisher, year, edition, pages
2010. 1689-1695 p.
Keyword [en]
Buoyancy effect, Conductivity of fluids, Flow and heat transfer, Heat transfer deterioration, Heated wall, Low mass, Low-Reynolds number turbulence model, Mass flow rate, Numerical predictions, Supercritical water, Triggering factors, Viscous sublayer
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Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-149595Scopus ID: 2-s2.0-77956209271ISBN: 978-161738643-5 (print)OAI: oai:DiVA.org:kth-149595DiVA: diva2:740562
Conference
International Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010, 13 June 2010 through 17 June 2010, San Diego, CA, United States
Note

QC 20140825

Available from: 2014-08-25 Created: 2014-08-25 Last updated: 2014-08-25Bibliographically approved

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Anglart, Henryk

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