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Science and Technology of Nuclear Installations
Volume 2008, Article ID 405072, 5 pages
Research Article

Theoretical and Numerical Study of Heat Transfer Deterioration in High Performance Light Water Reactor

Department of Reactor Technology, Albanova University Center, Royal Institute of Technology (KTH), 106 91 Stockholm, Sweden

Received 10 March 2008; Accepted 7 August 2008

Academic Editor: Ivo Kljenak

Copyright © 2008 David Palko and Henryk Anglart. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A numerical investigation of the heat transfer deterioration (HTD) phenomena is performed using the low-Re k- turbulence model. Steady-state Reynolds-averaged Navier-Stokes equations are solved together with equations for the transport of enthalpy and turbulence. Equations are solved for the supercritical water flow at different pressures, using water properties from the standard IAPWS (International Association for the Properties of Water and Steam) tables. All cases are extensively validated against experimental data. The influence of buoyancy on the HTD is demonstrated for different mass flow rates in the heated pipes. Numerical results prove that the RANS low-Re turbulence modeling approach is fully capable of simulating the heat transfer in pipes with the water flow at supercritical pressures. A study of buoyancy influence shows that for the low-mass flow rates of coolant, the influence of buoyancy forces on the heat transfer in heated pipes is significant. For the high flow rates, buoyancy influence could be neglected and there are clearly other mechanisms causing the decrease in heat transfer at high coolant flow rates.