Dana;
Thanks for pointing out the dry ice & alcohol slurry trick. It does work
very well!
BTW, liquid helium (LH2) is quite a bit cooler than liquid nitrogen
(LH2=4.2K, LN2=77K) but NEVER, NEVER fool around with that stuff unless your
insurance is paid-up! It is so cold that it freezes other gasses (N2, O2)
out of the air and forms an ice plug in the neck of the Dewar......its
internal pressure eventually blows up the container. Leave anything colder
than LN2 strictly alone!
Regards, Neil Tucson, AZ
-----Original Message-----
From: Dana [mailto:dana@goulston.net]
Sent: Wednesday, November 27, 2002 12:07 AM
To: Land Speed
Subject: FW: Ice Intercooler
OK, here's the cat's whiskers ... Dana's custom Intercooler recipe.
Take some dry-ice (about 5 lbs.) and chop it up with a hammer so the pieces
are about the size of beach pebbles or small rocks. Dump them into an
insulated container (a dewar or cryogenic container is best). Add a gallon
or so of rubbing alcohol (Isopropyl Alcohol) and stir gently.
Now run your intake charge line through the liquid mess (called a slurry).
Make sure your line is metal. Seal it all up (leave a vent for the
evaporating CO2), and you'll transfer more heat than you can ever dream of
making.
I haven't tried it yet, but I'm playing with it for 2003.
Water makes dry-ice clump. Methanol is too volatile and flammable. Isopropyl
is cheap!
Only thing colder is liquid Nitrogen ... and that would look WAY COOL as
you're pouring it in at Bonney with white clouds pouring out on the ground
around your feet.
Dana
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