Theoretical and Numerical Study of Heat Transfer Deterioration in High Performance Light Water Reactors
2008 (English)In: Science and Technology of Nuclear Installations, ISSN 1687-6075, Vol. 2008Article in journal (Refereed) Published
A numerical investigation of the heat transfer deterioration (HTD) phenomena is performedusing the low-Re k-w turbulence model. Steady-state Reynolds-averaged Navier-Stokesequations 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.
Place, publisher, year, edition, pages
2008. Vol. 2008
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-81515DOI: 10.1155/2008/405072ScopusID: 2-s2.0-77951213149OAI: oai:DiVA.org:kth-81515DiVA: diva2:497567
QC 201205092012-02-102012-02-102012-12-04Bibliographically approved