Quote:
Originally posted by leejsmith
bigben2k how does the impingement work on the cup walls ?
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I answered this in the Cascade thread.
Water hits the base of the cup and the "shape" of the flow is a bit like an up-side down funnel. At the edges of this funnel-shape the velocity of the water is only a slightly less than the velocity of the water coming out of the jet (once you get past the outside of the funnal shape, the water velocity dramatically drops off).
The cup walls should be placed such that they are just outside of the funnel shape. The water travelling sideways smashes (impinges) on the cup walls giving a secondary impingement effect right where we want it.
Here's a quick image I found.
