Seems to me that pressure drop would be caused by restriction and if the total area open to flow (number of tubes and cross section of tubes) is OK then the only source of drop would be turbulence caused by friction along the tubes. But I am probably missing something. I know an expert hydraulics guy. I'll check out what he thinks and see what I am missing.
KKROFFTNow occurs everywhere, simultaneously. But it doesn't have to be experienced the moment it happens. Every now that ever was is still exactly when it was, when it was now. Then, in terms of perception, is nothing more than all the nows that are no longer now. Thus, the difference between now and then is when. --The Waystoppers Users' Manual 
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