What do they use in high dollar gear that really needs this? Fluorinert,
such as FC77. Totally inert, very low viscosity, doesn't tend to cling to
the electronics, etc. available in a variety of boiling points so you can do
"ebullient cooling" (aka 2 phase cooling)which doesn't need a pump, and is a
lot more flow than straight convective flow. You can also pump and spray it
on the board. It's about a specific gravity of 2.
But.. it's about $500-600/gallon, so don't spill it.
And, it dissolves enough oxygen that rats can be immersed and breathe it and
survive to wiggle another day.
I remember when I was about 15 years old, a guy (either a doctor or
engineer) came to my school and demonstrated this to my class. I still
remember it very clearly. He first used a bit of chloroform or ether to
'knock out' the mouse then put him into the beaker of fluid. We watched
the mouse breathe under the fluid for a while. When the mouse was pulled
out the guy said 'time for a bit of mouth-to-mouse resuscitation' and blew
into the mouse's nose to help clear the fluid out of the mouse's lungs.
(All the girls were suitably disgusted by this step!) After a minute the
mouse was running around again and seemed no worse off.
Cheers,
Bruce
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