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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you put something hot into a liquid, you have to worry about
forming a film of vapor that keeps the liquid from touching the hot thing, and
radically reduces the heat transfer. It’s all tied up with the turbulence in
the liquid, the surface tension of the liquid, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Boiling is a really good way to move heat: the heat of
vaporization is huge, for a small temperature change, compared to just the
liquid’s specific heat. But, it’s more complex to design. It’s used in very
high power solid state electronics and in high power vacuum tubes, as well. The
key is that the boiling point of the liquid has to be close to the desired
operating temperature of the parts being cooled. Various Freons work well.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Look up Leidenfrost effect (why LN2 droplets skitter around, or
water on a hot pancake griddle)..<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It’s also related to why you can walk across burning coals in
bare feet. (the true test of belief in Physics)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>James Lux, P.E.<br>
Task Manager, SOMD Software Defined Radios<br>
Flight Communications Systems Section<br>
Jet Propulsion Laboratory<br>
4800 Oak Grove Drive, Mail Stop 161-213<br>
Pasadena, CA, 91109<br>
+1(818)354-2075 phone<br>
+1(818)393-6875 fax</span><span style='color:#1F497D'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Jonathan Aquilina
[mailto:eagles051387@gmail.com] <br>
<b>Sent:</b> Wednesday, April 07, 2010 7:59 AM<br>
<b>To:</b> Lux, Jim (337C)<br>
<b>Cc:</b> Hearns, John; beowulf@beowulf.org<br>
<b>Subject:</b> Re: [Beowulf] 96 cores in silent and small enclosure<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>filming in
what sense with the heat though i thought that the heat would prevent the oil
from congealing?</span><o:p></o:p></p>
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