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Originally Posted by 8-Ball
The way I see it is as follows.
Flow rate through a restriction is a function of the pressure drop across the restriction.
Given a number of restrictions between the outlet and inlet of a loop, the total pressure drop is additive.
As an example, at a given flow rate, the pressure drop across the cpu block may be x, y for a gpu block, and z for all of the tubing.
Thus, to maintain this flow rate, you need a pump capable of providing head equal to x + y + z at the given flow rate.
Beyond that, the order of the components does not matter, as the pressure drop across a given component will always be the same for a given flow rate.
Is that correct or not.
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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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In other words, if you have pressure x at the block inlet and pressure x-dp at the outlet, would the resulting flow through the block be any different if the pressure was x+dp at the inlet and x at the outlet. The pressure drop is still dp, so it shouldn't matter.
If the flow rate through a block is the same in these two scenarios, then given that the geometry doesn't change, the velocity of coolant shouldn't change either.
8-ball
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Yes, with higher pressure value dP s going to be higher and to maintain flow rate velocity has to go up. Head loss curves are non-linear and rise steeply after some point