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CFD Prediction 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: ASME Transactions, 2010, 641-642 p.Conference paper (Refereed)
Abstract [en]

Supercritical water will serve as a coolant in the Generation-IV Supercritical Water-Cooled Reactor (SCWR). The important advantage of supercritical water as a coolant is the lack of the phase-change phenomenon. As a result one of the most limiting factors applicable to the current Light Water Reactors (LWR) – namely the occurrence of the Critical Heat Flux (CHF) – is no longer existent. Considering the high heat capacity, supercritical water is indeed an excellent choice for a coolant. However, even though CHF is no longer an issue, heat transfer to supercritical water suffers from a sudden Heat Transfer Deterioration (HTD) phenomenon. HTD manifests itself with a sudden reduction of the local heat transfer coefficient and local increase of the heater wall temperature. Even though the phenomenon has been intensively investigated in the past 50 years, there is a lack of a robust and accurate criterion for the onset of HTD.

Recently, Palko and Anglart (2007) demonstrated that the onset of HTD can be captured with a computational model based on the Reynolds Averaged Navier Stokes (RANS) equations and using the Shear-Stress Transport (SST) turbulence model implemented in the CFX code (Menter, 1993).  The calculations revealed that there are two principal mechanisms of the onset of HTD: (a) reduction of the turbulence intensity close to the wall due to the buoyancy effects, (b) creation of a thin layer of supercritical water with low thermal conductivity (corresponding to the “vapor” phase of the supercritical fluid). The former mechanism occurs for relatively low mass fluxes, whereas the latter occurs when the mass flux of coolant is pretty high. The present paper presents further numerical investigation of the HTD phenomenon, and in particular, a derivation of the criterion for the onset of HTD based on numerical simulations.

Place, publisher, year, edition, pages
2010. 641-642 p.
National Category
Energy Engineering
Research subject
SRA - Energy
URN: urn:nbn:se:kth:diva-80481ScopusID: 2-s2.0-79551663060OAI: diva2:496347
2010 ANS Annual Meeting and Embedded Topical Meetings, San Diego, CA, 13 June 2010 through 17 June 2010
QC 20120214Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2012-02-14Bibliographically approved

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