ok, i need a little bit more clarification on this 'sucking out' issue.
is the ratio i need to work out the outlet area:inlet area, or hydraulic diameter outlet:hydraulic diameter inlet?
if it is the latter, how do i calculate the hydraulic diameter of the outlet?
i have 3.5mm cups, with 3/32 tubes (2.38mm od, 1.67mm id)
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