Quote:
Originally posted by Aleck
as the fluid gets further away from the axis of the jet, it gets slower and the boundarylayer gets thicker
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The effective water velocity remains pretty much unchanged at the edges of the "cone" of impingement. It's only after the water "bounces" that it slows down.
The trick to the Cascade was to guage the cup diameter to present the cup wall just after the point of "rebound" from the cup base. This of course is dependent upon the jet velocity but I believe that I managed to pick a jet/cup width ratio that applies to the general flow rates that people use. In general it was okay to have the cup wall being slightly too far away as opposed to being too close. This allowed me to design to higher flow rates and not suffer terribly at lower flow rates.
If I were designed a low-flow only block (<2LPM), I would have done quite a number of things differently.