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# Heat Sink Theory - Page 4

Quote:
 Originally Posted by rabidgnome229 My recommendation would be a tuniq-tower style HS with rows of parallel tubes creating a rectangular area to replace the plates. A though occurs, tho. It is possible to fit more plates into a given volume than cylinders. My optimization was based on a constant volume of material - so given say 10 cm^3 of copper tubes would be the best design. What may be more useful would be to find the shape that maximizes surface area within a volume of space. Back to calc... P.S. - Just in case anybody was planning on actually creating a design my previous optimizations found that 1 - given a volume V of material taking the form of a square plate length x and depth y the optimal (most surface area) dimension is x = V^(1/3) 2 - given a volume V of material taking the form of a cylinder with radius r and length x the optimal dimension for r is given by r = V^(1/3)

Good stuff there!!! A flattened cylinder might be a Happy compromize.....
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NNNNOOOO!!! Why did you have to suggest that. Now I'm gonna make myself do calc with eliptical prisms. I hate conic sections
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Quote:
 Originally Posted by rabidgnome229 NNNNOOOO!!! Why did you have to suggest that. Now I'm gonna make myself do calc with eliptical prisms. I hate conic sections
Wouldn't we be moving into wing territory? Cool!
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Quote:
 Originally Posted by rabidgnome229 NNNNOOOO!!! Why did you have to suggest that. Now I'm gonna make myself do calc with eliptical prisms. I hate conic sections

.................
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Quote:
 Originally Posted by Peritus Wouldn't we be moving into wing territory? Cool!

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Quote:
 Originally Posted by rabidgnome229 What may be more useful would be to find the shape that maximizes surface area within a volume of space. Back to calc...
This seems illogical to me... I purposely ignored this constraint for the same reasons we spoke about earlier, "choking"... Wouldn't having them spaced out allow for more "room temp" or cooled air to cross the heat sink?

The only exception, other than actual space constraints, that I can imagine would only occur, would be in an active heat sink .. with a fan..

The reason being, that the fan has a limited area upon which to blow... In a passive heat sink, room air is more omni-present (if that combo of words is even possible)..
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Here's a random picture that I thought interesting...

THE FOLLOWING IS FROM THIS LINK: http://www.coolingzone.com/Guest/New..._Ake_2002.html
"Conclusions

A bypass is always associated with a performance loss.

A porous body approach can be used to develop a reasonably successful bypass flow theory.

A heat sink with a bypass is always optimised for one particular air velocity. The potential loss when used at another velocity is usually moderate.

The fin thickness is a critical parameter and significant gains can often be made if it is optimised.

Overviews of heat sink performance are very appreciated in the front-end design process on the condition that they are created fast enough to keep the discussions alive."
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Somebody's studying trees..

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Quote:
 Originally Posted by FrankenPC I've often wondered if you could use a low temp vaporizing liquid in a heat pipe assembeled in such a way the the copper block has two stages. On the bottom is the "heater" which vaporizes the liquid...that gas travel's up several heat pipes into a condenser which then lets the condensed liquid flow back down a separate set of tubes into a insulated block (plastic) on the top of the copper block with a one way valve to allow the condensed liquid back onto the CPU block. So, you would have a simple circulation system power by expanding gasses and not a pump.
...that's what a refridgerator does. It has a vaporizor and a condensor and the fluid just runs around in a loop. It could be done, and probably fairly effeciently as long ask you kept the area small (only cooling 2 in square instead of 2 cubic yards...), but that's what phase is (i think)
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