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spinning fractal heatsink

A more advanced way to cool a chip
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The best way I can explain this idea is to lead you through the thought process.

I was looking at the fan on a CPU cooler. Current fans are plastic, and just move air over the heat sink. I thought it would be better if it had metal blades instead of plastic, so that the air moving over the blades would help the cooling.

Then I thought that if you are going to have a metal fan to disperse heat, why not get rid of the whole static heatsink, and have just a moving metal fan. But, instead of fan blades, have some 3-D fractal structure that maximizes surface area to have more cooling.

So now imagine a spinning metal evergreen tree over the cpu. I don't know how the joint connects to the CPU -- probably some thermally conductive grease. I don't know if friction would be a problem, but there already is friction in current CPU cooling fans adding heat. So there.

lawpoop, Oct 19 2005

Here's a real working spinning-heatsink-as-a-fan (apparently) https://www.extreme...hats-also-a-cpu-fan
The heat transfer from the stator to the rotor is accomplished by an air gap, they claim! [notexactly, Apr 25 2019]

[link]






       Since the fan doesn't connect to the CPU (and could not possibly connect to the CPU), it doesn’t matter what it's made of. The design of the heat sink is what you should be concerned about.
ldischler, Oct 19 2005
  

       [ldischler] I just mean that there is a continuous mechanism of heat transfer, rather than empty air.   

       Anyways, I think you're missing the point. In this, the fan *is* the heatsink. There is a single spinning contraption that draws heat away from the CPU and transfers it into the air.
lawpoop, Oct 19 2005
  

       Even if you could mount the shaft of a fan to a CPU, the heat transfer would be greatly limited by the bearings, and by the relatively thin shaft. Much better to mount a heat sink to the CPU and blow air over that.
ldischler, Oct 19 2005
  

       OK, how about a thick shaft? What about a fan stalk that 'floats' in grease instead of spinning around ball bearings?
lawpoop, Oct 19 2005
  

       Never mind the 'fractal', it seems the 'spinning' is giving you the problems. How about just a fractal heatsink? Regular fan, cool metal cooling block?
lurch, Oct 19 2005
  

       Where would you put the fan on a fractal heatsink? Whatever the exact shape of it, I'm certain it won't have any flat spaces if it truly is maximized for surface area.
lawpoop, Oct 19 2005
  

       Poop. Even a thermal grease has a conductivity 400 times less than aluminum. And you don't put the fan on a heatsink. You put the fan so that it blows air over the heatsink, which works best if bonded directly to the CPU.
ldischler, Oct 19 2005
  

       Dischler. You *do* put a fan *on* a heatsink, and yes, I'm well aware of its role in blowing air over the heatsink.   

       Maybe then we mount the fractal heatsink on the chip and have the entire chip spin?
lawpoop, Oct 19 2005
  

       Now you're talking!
ldischler, Oct 19 2005
  

       I'll jump straight to the next step, since maintaining the connections between the board and a spinning chip would be more than a little bit difficult. Spin the whole computer, minus the case. Even have the monitor spin (it has wires to the computer as well) and set the refresh rate accordingly.
Worldgineer, Oct 19 2005
  

       Short-range radio communication between the chip and the board. No need for spinning motherboard, or monitor for that matter.
lawpoop, Oct 19 2005
  

       Perhaps the fan could be mounted in a ring-shaped bearing, rather than a shaft shaped bearing, to maximize thermal contact with the CPU.
ye_river_xiv, Jul 17 2016
  

       Hot tip: you don't have to cool using air.
WcW, Jul 17 2016
  
      
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