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Originally Posted by Les
Yes, intelligent "sucking and seeing" is the the key to r&d.
However unraveling the "mystery" can be fun.
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I did, and still do, have prototypes here whereby I implemented a more "classical" jet impingement block, meaning cups that were large enough in relation to both the jet size, and jet offset from the base. Still cup based, but the cups were much larger to a point where the equations worked out that the jet impingement activity should be forming properly, and "h" was maximised.
In order to make it all fit, there weren't that many jets/cups (~20) and over a slightly larger area than the Cascade covers. Jet velocity was much higher than for a Cascade, and the block was a lot more restrictive. Increased bp thickness (to 1.8mm) to "compensate" for variations in h that occur with the radial distance from the jet center.
End result was something that only basically matched the White Water, even at lower flow rates where the thicker bp should've helped it out.
I tried a number of variations on the "classical" impingement theme, and was basically unable to match a Cascade, and certainly not with anything like the low (in comparison) pressure drop that the Cascade/SS has.