Effect of Hood on Selective Withdrawal in Cross-Flow

抄録

Selective withdrawal from a two-layered thermally stratified cross-flow through a single round hole with and without a hood (cap) is considered. Experimental measurements of drawdown, the critical withdrawal rate and the mean temperature profile in the vicinity of the hole are provided for both cases. Flow visualization is reported, which provides detailed information on the structure and dynamics of mixing of warm and cold water. Flow visualization studies show the formation and shedding of a horseshoe vortex at moderate withdrawal rates for a hooded case, which is independent of stratification. The presence of a hood inhibits drawdown of the interface over the hole and thus reduces the amount of drawdown at any withdrawal rate.