Experimental Study of Pressure Loss in a 5 × 5–Rod Bundle With the Mixing Vane Spacer Grid

Axial and lateral pressure loss in a 5 × rod–bundle with split-type mixing vane spacer grid was experimentally measured using differential transmitters at different sub-channel Reynolds numbers (Re) orienting angles. The geometrical parameters of the 5–rod bundle are as follows: they have same diameter (D = 9.5 mm) pitch ( p 12.6 those real fuel rods typical pressurized water reactor (PWR), hydraulic h ) 11.78 mm. characteristics resistance models discussed. main axial is caused by grid, generates additional wall friction downstream grid. shows strong correlations angles distance from sudden burst vanes region slight augmentation z 3D . After , decays an exponential way it becomes constant quickly 20D