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How about borrowing some stuff from aerospace design? Take a long ribbon of aluminum and perforate it with tiny holes all over. Fold the ribbon like an accordion and bring the ends together to form a radial sink.<br />
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Now, you have two pressure gradients. The inside of the radius, where the airflow is being forced via a fan. And the outside where free flowing air is being pushed and pulled through the holes. This, not only minimizes friction by allowing surface pressure equilization through the holes, but it also allows both sides of the ribbon to be cooled simultaneously.<br />
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The reason I bring this up is, if you increase the density of fins too much, you severely restrict air flow. This is a way to maintain high fin density and flow rate at the same time.<br />
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I would draw a diagram, but, I would need CAD to do it. No CAD on this machine <img src="/images/smilies/frown.gif" border="0" alt="" title="Frown" class="inlineimg" />
 

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Originally Posted by <strong>ae804</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1391778#post1391778" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">...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)</div>

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</div>RIght, I'm talking a compressorless phase design. Thanks for pointing that out.
 

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<div>Originally Posted by <strong>Peritus</strong> <a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1391738#post1391738"><img alt="View Post" class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" style="border:0px solid;"></a></div>
<div style="font-style:italic;">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?<br><br>
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..<br><br>
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)..</div>
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First off you want a fan. Passive heat sinks suck no matter what you do. Secondly - increasing the density of the fins will increase the cooling power but restrict air flow which lowers cooling power. There is a balance that would have to be achieved.<br>
The tuniq tower works better than a HS with one fin would because it is designed so that it will not block the airflow enough to lose efficiency
 

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Discussion Starter #44
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<div>Originally Posted by <strong>rabidgnome229</strong> <a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1392263#post1392263"><img alt="View Post" class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" style="border:0px solid;"></a></div>
<div style="font-style:italic;">First off you want a fan. Passive heat sinks suck no matter what you do. Secondly - increasing the density of the fins will increase the cooling power but restrict air flow which lowers cooling power. There is a balance that would have to be achieved.<br>
The tuniq tower works better than a HS with one fin would because it is designed so that it will not block the airflow enough to lose efficiency</div>
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Interesting.. Thanks for explaining further... I'm very interested in the physics and dynamics of heat sinks and this helps me a great deal to discuss...<br><br>
Here's something interesting...<br><a href="http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JEPAE4000128000001000038000001&idtype=cvips&gifs=yes" target="_blank">http://scitation.aip.org/getabs/serv...cvips&gifs=yes</a>
 

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Discussion Starter #45
Somewhat similar idea...<br><br><a href="http://www.halfbakery.com/idea/spinning_20fractal_20heatsink" target="_blank">http://www.halfbakery.com/idea/spinn...tal_20heatsink</a>
 

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Discussion Starter #46
Vascular trees... Coolness<br><br><a href="http://www.radiotherapie.nl/dissert/kotte/summary.html" target="_blank">http://www.radiotherapie.nl/dissert/kotte/summary.html</a>
 

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Discussion Starter #47
3.2.3. Tree Structure Schemes<br>
A more elaborate heat-extraction system configuration type is represented in Figure 3.3 whereby<br>
heat is gathered through a tree-type structure and channelled into specified paths. Such a system<br>
takes advantage of geometric formations found in nature to optimise the flow of thermal energy<br>
from within a three-dimensional volume to certain locations [1]. Conduction trees may either be<br>
two-dimensional in nature or three-dimensional as indicated in Figure 3.3.<br>
Three-dimensional<br>
structure:<br>
Figure 3.3 Example of a conduction tree type structure<br><br>
A heat-extraction configuration of this nature has the advantage that the heat flow paths can be<br>
optimised to a greater extend than those mentioned before and are thus closer to the absolute<br>
thermal optimum. Manufacturing cost will however be considerably higher than for the<br>
previously mentioned concepts.<br><br><a href="http://etd.rau.ac.za/theses/available/etd-07042005-122827/restricted/03Chapter03.pdf" target="_blank">http://etd.rau.ac.za/theses/availabl...3Chapter03.pdf</a>
 

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Discussion Starter #48
<a href="http://fluid.ippt.gov.pl/seminar/text/MStanczyk.pdf" target="_blank">http://fluid.ippt.gov.pl/seminar/text/MStanczyk.pdf</a>
 

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Wow - I've never seen a quad-post before <img alt="" class="inlineimg" src="/images/smilies/biggrin.gif" style="border:0px solid;" title="Big Grin">
 

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Discussion Starter #50
<a href="http://www.memagazine.org/backissues/october97/features/nature/nature.html" target="_blank">http://www.memagazine.org/backissues...re/nature.html</a>
 

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Discussion Starter #51
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Originally Posted by <strong>rabidgnome229</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1392358#post1392358" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">Wow - I've never seen a quad-post before <img src="/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" /></div>

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</div>lol.. Oh well.. I'll try to consolodate into one link post...
 

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Discussion Starter #52
Hey though... Please verify that the following disproves my theory... I'm not sure that I'm reading it right...<br />
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<a href="http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000073000006066302000001&idtype=cvips&gifs=yes" target="_blank">http://scitation.aip.org/getabs/serv...cvips&gifs=yes</a><br />
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"Fractal-like tree networks reducing the thermal conductivity<br />
Boming Yu1 and Baowen Li1,2<br />
<br />
1Department of Physics and Center for Computational Science and Engineering, National University of Singapore, Singapore 117542 2Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, 210093, People's Republic of China<br />
(Received 3 November 2005; published 6 June 2006)<br />
<br />
The effective thermal conductivity of composites with embedded self-similar -shaped fractal-like tree networks is studied. It is found that the effective thermal conductivity of the composites with these networks is related to the structures of the networks and the ratio of the component thermal conductivities: the longer the branches, the lower the thermal conductivity; the smaller the ratio () of successive branch diameters, the lower the thermal conductivity; the denser the network, the lower the thermal conductivity. It is also found that the thermal conductivity of the -shaped fractal-like tree networks does not obey Murray's law. The present results show that a network embedded in a composite plays an important role, and the thermal conductivity of the network itself may be less than that of the original material by several orders of magnitude. Fractal-like tree networks can significantly reduce the thermal conductivity compared to an equivalent single cylinder.<br />
"
 

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Discussion Starter #54
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Originally Posted by <strong>rabidgnome229</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1392410#post1392410" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">Yup - that pretty much says you're wrong</div>

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</div>Cool.. now I'll be able to sleep tonight...<img src="/images/smilies/thumb.gif" border="0" alt="" title="Thumb" class="inlineimg" /> <br />
<br />
Thanks
 

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Nice to see emperical thought. Many before us based their ideas on nature (Martial Arts is one of them - Though non-sequitur) re: DaVinci.<br />
<br />
I have not read all the posts so forgive me if this is redundant, but such a structure would be quite fragile.
 
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Originally Posted by <strong>Peritus</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1392416#post1392416" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">Cool.. now I'll be able to sleep tonight...<img src="/images/smilies/thumb.gif" border="0" alt="" title="Thumb" class="inlineimg" /> <br />
<br />
Thanks</div>

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</div>LOL....Not at you but with you!!! I know how it feels to have a thought stuck in my mind while I'm trying to sleep...<br />
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That link you found does pretty well shoot your project down...But don't give up, re-direct your efforts into another design...<img src="/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
 
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Originally Posted by <strong>ira-k</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1392437#post1392437" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">LOL....Not at you but with you!!! I know how it feels to have a thought stuck in my mind while I'm trying to sleep...<br />
<br />
That link you found does pretty well shoot your project down...But don't give up, re-direct your efforts into another design...<img src="/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" /></div>

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Haha... It's to know I'm not the only one... And as far failed projects go, it's all good... I read too much popular science as a kid and not enough math and phsysics.. lol... Onwards!
 
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