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Silver Water Block - Page 4

post #31 of 50
Quote:
Originally Posted by Droviin View Post

I've thought about running a mercury loop, but the fact that mercury reacts with most metals is a huge problem. If I diamond coated the surface of the heatsinks and found a pump that can handle mercury however...

Mercury has a heat capacity of 1.88 joules/ml/k as opposed to 4.2 joules/ml/k for water....so would only be half as effective as water.
post #32 of 50
Quote:
Originally Posted by technogiant View Post


Mercury has a heat capacity of 1.88 joules/ml/k as opposed to 4.2 joules/ml/k for water....so would only be half as effective as water.

Along with the ability to release poisonous mercury vapor
post #33 of 50
Thread Starter 
Quote:
Originally Posted by technogiant View Post


Mercury has a heat capacity of 1.88 joules/ml/k as opposed to 4.2 joules/ml/k for water....so would only be half as effective as water.

TIL: Conductivity means little in regard to heat capacity.
post #34 of 50
Quote:
Originally Posted by Droviin View Post

TIL: Conductivity means little in regard to heat capacity.

Conductivity must still make a difference though, I mean the heat would pass into the mercury much faster than it would in water, its conductivity is 16X that of water...but it can only carry half as much energy for a given flow rate and temp delta.

I suppose if you were able to drive high flow rates then mercury may start to beat water as it would take the heat up more quickly as it passed through the block, and the high flow rate would make its lower heat capacity less relevant.

But given it's density is 13X that of water then a high flow rate isn't likely.
post #35 of 50
How about liquid gallium? Almost 5x the thermal conductivity of mercury and less than half as dense. You couldn't use any aluminium though.
 
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post #36 of 50
Gallium will penetrate just about any metal you put it with, same as mercury. If you make the flow more turbulent over the CPU the actual flow rate doesn't work that much, turbulence will move the heat away from the surface more effectively. Magnetic induction pumps have been used and can be efficient.
Quote:
Originally Posted by technogiant View Post

Graphene and diamond will not react with water, but the question is because they are different in nature to water will they interact at the surface sufficiently to transfer heat. The same way as oil and water will not mix.

There is a constant resistance between fluid and any material for heat transfer, heat transfer. The constant is only a function of the type of flow (rough turbulent, smooth turbulent, laminar), the resistance to heat transfer increases with the roughness of flow but so does the amount of resistance to flow so a stronger pump would be needed.
Edited by SDH500 - 3/26/13 at 7:06pm
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post #37 of 50
Quote:
Originally Posted by SDH500 View Post

Gallium will penetrate just about any metal you put it with, same as mercury. If you make the flow more turbulent over the CPU the actual flow rate doesn't work that much, turbulence will move the heat away from the surface more effectively. Magnetic induction pumps have been used and can be efficient.
There is a constant resistance between fluid and any material for heat transfer, heat transfer. The constant is only a function of the type of flow (rough turbulent, smooth turbulent, laminar), the resistance to heat transfer increases with the roughness of flow but so does the amount of resistance to flow so a stronger pump would be needed.

There is much more to solid/liquid heat transfer than just considering the type of flow turbulent or otherwise.

It's highly complex stuff but here's a link which highlights what I've been trying to explain.

http://www.ltnt.ethz.ch/publications/Journal/pubimg/2011_Hu3.pdf

Top and bottom of the report is that by increasing the hydrophillic nature of a solid surface at a water/solid interface they increase heat transfer by a factor of 3X....so these are far from minor inconsequential considerations.

So like I said, diamond and graphene being hydrophobic in nature regardless of them being good conductors are unlikely to transfer heat well across an interface with water.

I see your point about conductance......so turbulent flow would "mix the heat" through the fluid rather than relying on conductance of the fluid to distribute it.....so that really negates the importance of the coolants conductivity and again makes its heat capacity more important....which makes water "king" again.
Edited by technogiant - 3/27/13 at 12:47am
post #38 of 50
Graphene is pretty new and we really don't know anything of its full potential. It seems it an be switched between hydrophobic and hydrophilic just by altering its electric charge, but I only see water vapor being mentioned, not liquid.
 
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post #39 of 50
Granted if they can alter graphene in that way then great.....I know they can drop various atoms into the mesh structure......I'm not claiming to be any expert in these areas, I just know that a hydrophobic/water interface doesn't work well.....if the boffins can get around that then sign me up...thumb.gif
post #40 of 50
Whatever happened to direct die cooling water cooling? Even direct heat-spreader cooling would be awesome.
 
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