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SENSITIVITY ANALYSIS OF HEATED WALL TEMPERATURE AND VELOCITY DISTRIBUTION IN CFD SIMULATIONS OF THE UPWARDS FLOW OF 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
2011 (English)In: Proceedings of the 14th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, 2011Conference paper, Published paper (Refereed)
Abstract [en]

Supercritical water is characterized by a high molecular Prandtl number near the pseudo-critical point, which means that momentum diffuses much quicker compared to heat. Heat transfer at such conditions shows strong non-linear behaviour because of significant changes of the fluid properties. The sudden heat transfer deterioration occures with local reduction of the heat transfer coefficient, what leads to an increase in the heated wall temperature.

 

For a better understanding of the heat transfer deterioration phenomenon, water flow under supercritical conditions has been studied using the commercial CFD code ANSYS CFX 12.1. Numerical simulations of the turbulent, upward flow in a circular, heated tube were performed using the water properties according to IAPWS IF97. The main objective was to investigate sensitivities of the heated wall temperature and axial velocity distribution predictions on certain model parameters. The model sensitivities were examined on the mesh discretization, boundary conditions (inlet temperature, mass flux, heat flux and pressure), fluid properties and selection of a turbulence model. Selected experiments of Ornatskii (1971) and Shitsman (1963) have been used for validation of the obtained results.

Place, publisher, year, edition, pages
2011.
National Category
Energy Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-80412OAI: oai:DiVA.org:kth-80412DiVA: diva2:496300
Conference
NURETH-14
Funder
StandUp
Note
QC 20120213Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2012-02-13Bibliographically approved

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Anglart, Henryk

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