Quote:
Originally posted by GeminiCool
Reading my post this morning, I agree it is very unclear, and I see where you have been mislead. The Velocity through both fittings in a closed loop system is the same, ok sorry didn't mean to imply that it would be different.
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Before we go further, let's correctly define out English terms:
Velocity does not equal flow rate.
Flow rate = volume / time
Velocity = distance / time
For a set given flow rate, the velocity will be increased as the same volume of water per unit of time is forced through a smaller opening.
Thus velocity will only be equal through a system of uniform orifice sizes.
In summary:
The sum of resistances defines a fixed flow rate when those resistances are applied against a pump's pumping pressure.
It is perfectly valid to make comparisons of a system of a certain flow rate regardless of how that particular flow rate was achieved, whether that be through squeezing the hose, using a smaller capacity pump, or using a powerful pump but with lots of restrictions (note - we are ignoring pump heat in this scenario).
With respect to your variety of scenarios, each scenario you presented represents a particular flow rate due to the restrictions that those scenarios offered against the pump. The end result would bea particular flow rate unique to each scenario. The water-block's performance is dictated purely by flow rate (given a set coolant temperature and a set heat load) regardless of how that particular flow rate was arrived at.
You presented a set of slightly different restriction scenarios, but the exact details of those scenario's is unimportant. The only important detail is the resultant flow rate as a result of those restrictions.
I hope that clears it up.