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Water Cooling water flow

post #1 of 9
Thread Starter 
So, it's been a month since I have the water cooling set-up and I'm a bit curious about water flow...

How much should be the minimum and maximum water flow..

I understand that;

Too low flow -- Would make it more possible to heat up the cpu as the water moves slowly.

Too high flow -- Would have much time to cool up in the rad.

so can any one give me some values?
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post #2 of 9
Thread Starter 
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post #3 of 9
I don't notice any temp change between the d5 low and full. what are your pumps lph settings?
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post #4 of 9
Quote:
Originally Posted by Charlton22 View Post

Too low flow -- Would make it more possible to heat up the cpu as the water moves slowly.
yes, higher flow and higher agitation make better heat transfer as both allow quicker exchange of water molecules that have already absorbed heat with those that havent, hence can absorb heat faster.

Quote:
Originally Posted by Charlton22 View Post
Too high flow -- Would have much time to cool up in the rad.
Higher flow and higher agitation in rad will (just like in cpu) allow molecules that have already lost some energy (hence will lose further heat slower) to be replaced with molecules that havent lost energy yet, hence allow more rapid heat loss. At faster flow, you make more passes though less heat lost per pass, so those two even out, then you add into the fact water molecules with partial heat loss with have lower gradients/transfer heat slower than molecules with higher heat/higher gradient, hence more efficient heat loss with faster flow. You would have to push water at incredibly fast speeds to push a water molecule so fast it did not have time to lose some of its energy. Though just like a cpu, you get diminishing turns over time, and adding more pumps at some point will add more heat dump from pumps, then you can disperse with faster speed.

Martin's test (pic) on pump flow and rad. higher flow, better heat dissipated.
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post #5 of 9
Thread Starter 
I'm using an aquarium pump and I'm having 36Ltrs/Hr ~ 9.5Gallons/hr

Isn't it too low?
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post #6 of 9
restrictive blocks (like the EKs and heatkillers) high flow is a lot better.
forcing water though tight fins reduced my temps by 5-10c. single to dual 655.

Quote:
Originally Posted by Charlton22 View Post
I'm using an aquarium pump and I'm having 36Ltrs/Hr ~ 9.5Gallons/hr

Isn't it too low?
problem is the pressure is low on those. but in ur case so is the flow too...
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post #7 of 9
Quote:
Originally Posted by Charlton22 View Post
I'm using an aquarium pump and I'm having 36Ltrs/Hr ~ 9.5Gallons/hr

Isn't it too low?
You want at least 1 gallon a minute.
I mean it doesn't matter if your water is -10c but that's another story.
Edited by Khaotik55 - 7/30/11 at 10:07am
post #8 of 9
The flow is low because there isn't enough head pressure to keep the flow at the "rated" amount.
    
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post #9 of 9
Yep, like Khartik55 said, at lower than 1gpm you are on the steep part of curve for worse temps, see here. You are at .15 gpm.
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