Guess I should have stated my thoughts more clearly as I was assuming the rebounded to be too much interference to the point of slowing the jet down.
I guess the clearer question about the jet shear would have been, have you done flow testing to chech this or are there computer models that will show what the flow of your cup/jet is?
You obviously know alot about fluid dynamics it seems ( I know basically nothing as if you couldn't tell) so was just curious if the amount of shear happening was a guess aor calculated. I'm assuming calculated from the amount of study you've put into this.
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