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Well....actually the affinity laws, or pump laws for simplicity, have several limitations on their use. Even more limitations when looking at options of adding multiple pumps to a loop (which is what we were talking about)...because the pump laws were intended to predict changes in a pump curve (for a single pump) if you change the impeller size or speed. They are useful for providing estimates and predictions if you already know the pump curve. You can't create a pump curve using the affinity laws, without having already measured a real pump curve. The affinity laws are useful for predicting the pump curve...based on a change in pump speed....if you already have measured the actual pump curve for a given speed. That is what I was copying for gobase....the actual pump curve. And the actual pump curves will be different for even the same pump....when a different pump top is used on it. You can't use the affinity laws to build a pump curve from scratch....only to predict how the pump curve changes when you change the speed or the impeller size. So for gobase....or 99% of the watercoolers out there...the most useful information to have is the actual pump curve.
They are called 'laws' because they do not vary anywhere in the universe (except when conditions approach the speed of light) and have been derived/discovered through science and repeated experiment to test the hypotheses behind them.
I haven't "concluded on the basis of what might seem conventional wisdom".....all of my responses were based on the results of independent testing done in the water cooling community. I also haven't been discussing any "theories". Just the actual results of studies. There have been numerous independent studies in the water cooling community that simply measure the actual outcomes of temperature based on different flow rates. In almost all cases...they show lower temperatures for your components as flow rate increases. But only up to a point. Even LarryWill mentioned that his temperatures improved as his flow rate increased. He just doesn't feel the need for the 3 degrees lower temperatures he mentioned he got. The study I linked showed more like 5 degrees better as you increased flow....but everybody's system will be different. Everyone will also have their own goals for how their cooling system should perform. But most people who have chosen to tackle the additional expense of water cooling....are interested in performance.
Although I am not a fluid dynamics expert I have a science background in biological sciences and I understand the notion that you cannot simply conclude on the basis of what might seem 'conventional wisdom', moreover, you try to disprove a theory before you prove a theory as correct.
A double blind water cooling test? Look up the definition of "double blind" and you'll have as good a chuckle as I did at that one. Are you suggesting that the waterblocks themselves shouldn't be told if they are in a control group or not?
Most of the results of testing you see posted on the internet, while well intentioned and posted by people with genuine interest, should be taken with a grain of salt and seen as useful only for comparative purposes, not as absolute data. The tests are not double-blind.....
I went back and read all the posts to make sure....so I'm fairly confident when I say that "no one has done that". But if you are referring to the list of blocks and approximate pressure drops for those blocks....then yes...the total pressure drop should be estimated by taking the sum of the individual pressure drops. With caveats of course.
Fluid dynamics involves complex equations, you can't just add and subtract things from various test results like it was a shopping basket full of goodies and conclude on the basis of that.
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