Conference Proceedings Paper
Effect of Non-Uniform Porosity Distribution on Thermalhydraulics in a Pebble Bed Reactor
NURETH-14 - 2011 September 25-30
Gert Jan Auwerda (Delft University of Technology)
Yanhua Zheng (Tsinghua University)
Danny Lathouwers (Delft University of Technology)
Jan-Leen Kloosterman (Delft University of Technology)
In pebble bed reactors, the porosity profile shows strong fluctuations near the wall. These
changes in fuel density affect local power density, coolant velocity, and temperature distribution.
This paper describes the pebFoam code, capable of calculating pebble bed thermohydraulics
including non-uniform porosity distributions for arbitrary geometries, and investigates the
changes in velocity, pressure drop, and helium and pebble temperatures when using a nonuniform
porosity distribution instead of a uniform distribution. Results show only minor changes
in temperature profiles and pressure drop for full power steady state calculations, though the
velocity profile shows a clear increase in velocity near the wall.
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