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Originally Posted by Jabo
2. Performance peaking and then a drop-off is due to breaking the turbulent flow Re number and therefore expotentially(dunno the exact functional relationship as I write this) increasing restrictivness compared to flow rate increase. That's just my theory on that one.
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That was one theory that I had too, but was unable to find anything in theory or practise to back it up. Convection efficiency is always increasing with increased turbulence in tubular scenarios, even when factoring in flow resistance.