Am not wholly convinced in the multiple jets/hole thing. May work well in theory or in limited practise but unconvinced about it scaling down, in a machinable sense, to the levels being dealt with here.
In my experience multiple jet arrays work well provided they are being driven with sufficient pressure, and by that I mean >>10PSI, to ensure sufficient jet integrity when the jet outwashes start interfering with each other. I played with multiple jet arrays with decent results when giving 20PSI, but down at 2PSI levels performance seemed to fall away more quickly than anticipated.
I wonder what pressures are being considered in the research paper?
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