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Originally Posted by moonlightcheese
...however there comes a specific flow rate at which pressure drop begins.
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This is what had me thinking you were looking for the Reynolds number - essentially the point at which the flow transitions from laminar to chaotic. Now that I think of it, probably only an "open" block or maybe a maze block has laminar flow.
So the question becomes, given already-chaotic flow (so no "hockey stick" shape to the graph) what does the flow/restriction curve look like?