Quote:
Originally posted by MadDogMe
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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I think the main reason the 2 barb block is performing slightly less is because of lower jet volecity, not necessairly the restriction on the outlet (though that is an important aspect to get right)
When I'm testing the blocks for flow patterns I introduce a small "leak" on the suction side of the pump so I can "see" what the flow is doing inside the block(the iwaki pump churns up the bubbles very fine), the single outlet has no noticable effect on the jet's themselves, only after the water comes out of the jet holes does it make a beeline for the exit barb.
I use the holes like circular "fins", and the water flowing up the side of the hole should be almost as fast as the jet that's entering it, this also allows me to use a relitively thick base to mantain strength, I believe a thin >2mm divoted plate would work as good if not slightly better but copper strength starts to become an issue then without added support which would get in the way of the jet's most likley.