Effect of Non-Uniform Porosity Distribution on Thermalhydraulics in a Pebble Bed Reactor
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
G4-1 - Gas Cooled Fast Reactors and Very High Temperature Reactors; CFD Calculations

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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