Pressure Drop of Spacer Grids in Rod Bundles of 12 Rods with Smooth and Roughened Surfaces

摘要

Experiments have been performed on the pressure drop of spacer grids in rod bundles of 12 rods. Both a smooth and a rough rod bundle was used in the experiments. The artificial roughness cut into the outer surface of the rods was chosen such as to meet the actual design of a gas cooled fast breeder reactor. The results of this investigation for a Reynolds number range between Re=4.10 exp 3 and 7.10 exp 4 indicate that the pressure drop at the spacer grids is higher in a roughened rod bundle than in a smooth rod bundle. (Atomindex citation 10:441601)