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H20 Flow path? Good article today on front page!

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Unoriginal Macho Moderator
Oct 12, 2001
Los Angeles
I thought the article by Larry Browning was very informative, if you use H20 or want to I suggest reading it! http://overclockers.com/tips915/ On a big momma system like that, I was not suprised to see the flow path pump>CPU>rad work better than pump>rad>cpu. In fact I have always thought that the first would be better - higher velocity through the block, slower through the rad. Why does everyone think pump>rad>CPU is better? Cause the water is cooler? The velocity just isn't there at the end of the cycle. Thought?


Jan 6, 2002
In a closed loop system where assuming that the order of components does not alter the total head loss (flow rate), the velocity will be constant no matter the order. Law of Conservation of Mass. Velocity is determined by flow rate and the flow rate is exactly the same through the entire system.


Feb 28, 2002
alright. how does this work.
flow is always CONSTANT THROUGHOUT THE SYSTEM am I right? as somebody put it, how can you put in more water at one end without having the same amount of water come out right?

ok. so if flow rate is constant. the only that can change is velocity. so how the hell does velocity slow down at the end of a cycle?? the only thing that should impact velocity is the size of the channel or design of the rad or something right. so in a pump->rad->block config, and in a pump->block->rad config. the pump, the block, the rad, its all the same. so why should velocity be any different just cos it comes out of the pump first or last? correct me if i'm wrong. and i'm prepared to be :burn:


Aug 25, 2001
But there's always friction, which turns that velocity and pressure into heat. Otherwise, you get it flowing, and you wouldn't need any pumps to keep the thing flowing. :beer:



Mar 25, 2002
Washington State
Even if science isn't on Larry's side, his test results are still interesting. In the end, I think up to us to test different ideas on our own setups to see what works best.

I learned a few things from his article, and now I'm on to the original article by Bill Adams. I don't know how much of it I'll be able to apply since I want my eventual WC setup to fit inside my case, but knowledge is power. Thanks for bringing this to our attention, nikhsub1.



choke man
Jan 2, 2001
most pumps used have wet rotors, which means that much of the motor produced heat, and all of the pumping generated heat, is added to the coolant

if, after pumping, the coolant is routed through the radiator then "x" % of that pump related heat load will be removed before the coolant passes through the wb

but we are talking VERY small numbers here, and if the hose routing necessary for this sequence results in a decreased flow rate then there can be no gain, apparently what Larry observed

I must add that it is gratifying to see the results of a comprehensive systems approach
good job Larry

be cool