[Beowulf] immersion cooling for ASIC Bitcoin miners

[Ellis H. Wilson III]

On 11/26/2013 07:22 AM, Bogdan Costescu wrote:
> One of the pics shows a bubbling liquid surface, we've seen recently
> similar pics. From what I remember from past discussions on this very
> list, the bubbles are bad for heat transfer - it's OK to have them at
> or very near to the surface, but not down below. Has the physics
> changed behind my back ?

<queue non-physicist comment, 99% chance of being wrong>

I have heard (a long time ago, admittedly) from little overclocking 
birdies that in poorly-designed or tightly-packed arrangements, putting 
an aquarium bubbler or some such hacky bubbling mechanism allows you to 
avoid the hotspots in the oil you would otherwise suffer from around 
your main heating components (passively cooled bridges in home setups 
are known issues here).  Overall bubbles don't help heat dissipation 
(and may hurt it as suggested), but if your problem isn't the overall 
temp of the tank but instead making sure the temp is fairly average 
throughout, bubbles may help.  I've kept my mouth shut on the matter so 
far because I have no proper training in the area to ground this 
suggestion on.

<dequeue>

Going back to my storage hole now.

ellis

-- 
Ph.D. Candidate
Department of Computer Science and Engineering
The Pennsylvania State University
www.ellisv3.com