Quote:
Originally posted by myv65
Only if the flowrate remains constant. You would find that as the gap became smaller, the flow would also drop. The generic answer is that "downstream" stuff affects "upstream" stuff if the flow velocity is less than the speed of sound within the medium. Our velocities are much, much less than the speed of sound in water. So the question becomes, "How big must the gap be given the jet size, speed, etc., before changing the gap has no appreciable effect?" I suspect the answer would be single-digit millimeters, but that's merely a hunch.
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This is true, only if flow rate is constant and concure that the smaller the gap the less flow. I done tried it. Your hunch is right though. With our low pressure pumps, anywhere between 2 - 6mm depending on the size of the jet being used.
Couple of interesting thoughts. How much of an effect the angle of the jet and the actual shape of the base plate play a role? It's quite surprising.