Ahh..., another day at the office. Another day to bitch about differences in flow-rate that 90% of us don't have the tools to measure (myself included) to get our CPU 1/2 a degree cooler.
Quote:
Originally posted by jtroutma:
What I should have said was that with nothing attached, the pump will put out a large amount of volume of water with a fininte amount of pressure due to the large volume of water trying to make it through that small opening.
Someones going to dispute me again.... i just know it
|
A pump will always produce a finite/constant amount of pressure (unless you start altering it's voltage or something, but thats beyond this discussion) - regardless of the volume of water it is pushing, or how many blocks, rads, and other things are attached to the pump that is trying to stop the flow.
Once you know how much pressure the pump is creating, and how much resistance to flow the system will exert, you can calculate the volume of water that will move through the system. Obviously when there is no resistance to flow (pump sitting in a bucket with no tubing) the volume of water moved will be large. But the pump doesn't magically change the way it reacts to backpressure the moment you put it into an in-line system with some restrictions - it still tries just as hard as it ever has to move water (same pressure exerted on the outlet), though again obviously less water moves.
I'm not disputing what you are saying, just trying to clarify it. Our pumps react the same whether they are in a bucket with no resistance, or pushing water through a cooling loop that involves 10 computers with 10 blocks and 10 rads. Just that the ~5 PSI of pressure that our pumps provide doesn't move much water when you put that kind of restriction on it.
Quote:
Originally posted by MeltMan:
It sounds about right to me. Pressure only develops when there is resistance. Just like in an electrical circuit. What happens to the Voltage if you have direct short? (no load). Oh it drops to none.
|
If you have a short, voltage does not drop to zero. The battery continues to supply a voltage to the circuit. Without voltage no current would flow, without current flowing your wires would not melt and fuses would not blow. And if that was true, we wouldn't need circuit-breakers and such to protect against shorts. Though - with a short in the circuit it's likely that the battery or one of the connections to it will quickly fry. Once that happens there is no longer a complete circuit - now voltage is zero.