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Originally Posted by lolito_fr
thx guys for bringing me back down to earth 
bigben, im curious as to how you come up with the 1.8/0.9 ?
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check out lmno engineering's website (
http://www.lmnoeng.com/ ), for the formulaes to calculate the flow restriction of an annular outlet, or more specifically, to convert an annular (ring) "pipe" to a round one.
You'll find that the gap has an equivalent hydraulic diameter, hence my comment. You need to keep the exit velocity under the inlet velocity, otherwise the inpingement jet won't form.
I know it seems counter intuitive, when you look at the corresponding surface areas, but you can't beat the physics of it.