This is where BB's large outlet steps in methinks?, it's very important to have as little backpressure as possible with impingment cooling methinks?, plus it'd give a uniform 'spread' to the jet if the waters not all travelling the same direction towards a single outlet?. Does that make sense?...
PS, does it mean that water is contacting more surface area at the maintaned high velocity when holes are used instead of 'divets'?...
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