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Originally Posted by Jabo
That is 90% correct. You forgot that the lower the pressure the lower the dP (head loss/pressure drop) and conversly the stronger the pump the higher the dP valu is going to be! That's why it does make a differnece where you place your components
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Could you possibly clarify a little.
If you use a stronger pump, then yes the pressure drop would be higher, for obvious reasons.
OK, just to clear this up.
Two scenarios.
A pump,
one long length of tubing,
one short length of tubing,
a waterblock.
In the first scenario, the short length of tubing is before the block and the long section after. Lets make it really long, so there is a real difference in pressure)
In the second scenario, the long section is first, then the block, then the short section.
Would this have any affect on flow rates through the block? I would say not, since the OVERALL pressure drop for the loop should be the same, and so for a given pump, the flow rate would be the same in both scenarios, thus the velocity in the block should also be the same.
Granted the absolute pressure values will be different, but it is the actual pressure drop from one side to the other which drives flow, yes?
8-ball