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Originally Posted by Cathar
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Les, I have no real strong working models for what goes on in a Cascade. It is still somewhat of a mystery, mostly because at times when apparant theory said that things should be getting worse, they were actually getting better. I have enough of an understanding through emperical data on how to tweak it to best effect, and a rudimentary set of hypotheses of why, when tweaking one aspect, a certain result comes about.
There isn't really enough room in a Cascade cup in relation to the jet size for classic jet impingement activity to form. In fact, according to "classic" jet impingement theory, the block shouldn't perform as well as it does. I guess that's the difference between on-the-ground empericality, and theory. I don't pretend, on this one, to have enough of a clue to be able to derive theory for it. Am more interested in just making it work well through observation and experimenting.
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Yes, intelligent "sucking and seeing" is the the key to r&d.
However unraveling the "mystery" can be fun.