jaydee
If you want to think of it in electronic circuit terms think about the pump, which provides a pressure difference, as a battery which provides a potential difference. The current flows through the circuit from the point of highest potential to the point of lowest potential. The same is true for water circuits where the water flows from the point of highest pressure, just after the pump, to the lowest, just before the pump.
you can also think of each component as a resistor, which in an electric circuit has a potential difference accross it. In a water circuit this is a pressure difference. Every time the flow encounters a resistance the pressure drops even when flowing through pipes (or wires in electric circuits). The larger the diameter tube and the shorter it is, the smaller the pressure drop will be. Bends in the tube create an even larger pressure drop. The smaller the radius of the bend the larger the pressure drop.
this is something that Bernoulli told us, which is that if the flow has constant energy (which isn't strictly true for water cooling but probably close enough) then:
Kinetic energy+energy due to pressure+energy due to height=constant
energy due to height(gravitational potential energy) can be neglected due to no net height difference through the circuit.
This means that if you speed up the flow by having a converging nozzle (increase kinetic energy) this will result in a decrease in pressure. The same is true vice versa.
Hope this helps some peeps out as people seem to have a bit of difficulty understanding how the flow thing works
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