note: flow rate is *not* pressure.
Actually (setting aside parallel branches) the flow is constant and the same in just any point of the circuit.
The pressure is a factor of several things:
* pipe diameter
* position in the circuit. It's another flame-war topic but on a pure fluid dynamics point of view, the WB should be just after the pump (high pressure) and the rad just before the inlet (low pressure).
Theres a point in the circuit where pressure switches from positive to negative. (not: thats *always* the case even with our poor centrifugal pumps) you'll want that point to be *before* your rad and *after* your waterblock(s).
For more info on that there's a very good article at overclockers.com.
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