Conference Proceedings Paper
NUMERICAL INVESTIGATIONS OF COOLING HEAT TRANSFER OF SUPERCRITICAL WATER
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Heiko Herbell (EnBW Kernkraft GmbH)
Joerg Starflinger (University of Stuttgart)
Thomas Schulenberg (Karlsruhe Institute of Technology)
The re-heater and the start-up system are the only basically new components in the balance of plant of the High Performance Light Water Reactor (HPLWR). Inside the tubes of the re-heater, supercritical fluid undergoes pseudo-condensing. CFD simulations have been performed in order to determine the heat transfer coefficient on the tube side more accurately. Numerical results are compared with Bruch’s CO2-experiment  for validation. The results illustrate the influence of buoyancy forces on the laminar turbulent transition for vertical downward flows. A simple heat transfer correlation  has been proposed for re-heater design, which is compared here with numerical simulations. Fluctuating density stratification is obtained for a horizontal layout which is similar to a Kelvin-Helmholtz instability.
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