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i've seen a bunch of people on here say that too much flow is bad...

post #1 of 31
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their reasoning goes something like this- if the water flow rate is too high then it doesn't have time to absorb heat from the block. i don't understand how that is possible. can we clear this up please?
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post #2 of 31
If your loop is filled with water, it's not like the water is going to disappear after it flows through your water block. More water will take its place. I don't see how too much flow can cause water to lack the time necessary to absorb heat. If anything, each mL of water will be heated less, but it will circle around the loop and absorb additional heat faster than with less flow rate.
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post #3 of 31
Quote:
Originally Posted by ihatelolcats View Post

their reasoning goes something like this- if the water flow rate is too high then it doesn't have time to absorb heat from the block. i don't understand how that is possible. can we clear this up please?

Too much flow equals wasted flow since it won't improve your temps further and it only works to create excess heat for your pump/s. It's not reasoning when there's data to back it up.
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post #4 of 31
Quote:
Originally Posted by tsm106 View Post

Too much flow equals wasted flow since it won't improve your temps further and it only works to create excess heat for your pump/s. It's not reasoning when there's data to back it up.

The excess heat from the pumps makes sense. Too many pumps will eventually dump more heat into your system than whatever benefit you were getting.

Unfortunately, what some people are saying is "if the water flow rate is too high then it doesn't have time to absorb heat from the block". I don't think that makes any sense. Am I missing something?
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post #5 of 31
Very simple. Has nothing do do with flow but pump itself. If the pump runs 100% and there is more flow then is needed the pump will generate a generate amount of heat. If you run the pump @ 50% and flow is still more then enough you get better temp because pump is generating less heat.
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post #6 of 31
Quote:
Originally Posted by EAnushan View Post

Quote:
Originally Posted by tsm106 View Post

Too much flow equals wasted flow since it won't improve your temps further and it only works to create excess heat for your pump/s. It's not reasoning when there's data to back it up.

The excess heat from the pumps makes sense. Too many pumps will eventually dump more heat into your system than whatever benefit you were getting.

Unfortunately, what some people are saying is "if the water flow rate is too high then it doesn't have time to absorb heat from the block". I don't think that makes any sense. Am I missing something?

Anything higher than 1.5gpm (iirc that's the magic number) is wasted flow. In essence the idea that it doesn't have time to absorb the heat is just a lamens explanation of the overuse of flow. Just ignore it and go by the flow threshold of 1.5gpm.
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post #7 of 31
Quote:
Originally Posted by EAnushan View Post

Unfortunately, what some people are saying is "if the water flow rate is too high then it doesn't have time to absorb heat from the block". I don't think that makes any sense. Am I missing something?
That does NOT make sense.

Heat transfer via conduction is due to the differential in the two areas. Even if a single molecule will absorb less energy due to higher flow, there will be more overall "cool" molecules to absorb the heat. That 1.5GPM number is probably where this effect no longer provides returns.
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post #8 of 31
The 1.5GPM is likely an average, if it's even accurate. Water has a fairly low thermal diffusivity which means it needs more time per area to diffuse or "let go" of heat than a lot of other compounds and elements. But that's exactly why radiators are used to artificially balloon the surface area of the water without affecting pressure, and you have a lot of air passing through the fins to further expedite the heat exchange. If there were no mechanism to help dissipate the heat out of the loop then the water would keep a lot of the heat it's soaked up in the system and 1.5GPM might be relevant, but with radiators vastly improving heat exchange there's no problems.

If, in the off chance you do hit a ceiling where more coolant flow does not amount to more heat exchange, then you can simply bump up the ceiling by improving the rad's efficiency by cranking up the fans and pumping more air through it. thumb.gif

As long as your pump impellers aren't at the risk of cavitation (which becomes a problem when they're running beyond design specs) it's best to volt everything to the max and let em flow as fast as they can go.
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post #9 of 31
think they are gettimg confused with if there is to little flow and the water going through the block doesn't create enough turbulance charliehorse did something on this
here you go linky
Edited by Greenback - 12/13/11 at 2:13pm
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post #10 of 31
Turbulence is bad because it also causes cavitation and puts air in the block. There's a big difference between wanting the coolant to have access to as much of the block as possible and turbulence which creates air bubbles that accomplishes the opposite.

but there's truth in it I guess, a poorly designed block prone to cavitation will generate more air in the line with a faster flowrate. That has to do with poor block design though, not a fault of the flow
Edited by Petrol - 12/13/11 at 2:18pm
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