An experimental study has been carried out to investigate an I-type sparger
performance in view of pressure oscillation and thermal mixing in a poor.
Its pitch-to-hole diameter, P/D, varies from 2 to 5. The test conditions ar
e restricted to the condensation oscillation regime. In the present study,
two different hole patterns, staggered and parallel types, are employed und
er various test conditions. The amplitude of the pressure pulse shows a pea
k for pool temperatures of 45 similar to 85 degreesC. which depends on P/D
and the steam mass flux. The effect of hole pattern on the pressure load is
smaller than that of P/D. The dominant frequency increases with the subcoo
ling temperature of pool water and P/D. A correlation for the dominant freq
uency is proposed in terms of the pitch-to-hole diameter ratio and other di
mensionless thermal hydraulic parameters.