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#26
January 4th 09, 06:24 AM
posted to rec.radio.amateur.antenna,rec.radio.shortwave
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cantenna
Jeff Liebermann wrote:
On Sat, 03 Jan 2009 18:53:59 -0800, Jeff Liebermann wrote: Thermal Conductivity Viscosity W/mK cSt @20c Water 0.6 0.9 AF (glycol) 0.24 2.0 Water+AF 0.8(?) 1.5 50%/50% Silicon Oil 0.1 varies radically Mineral Oil 0.138 34.5 Fluorinert FC-77 0.063 0.75 Air 0.025 Copper 370. Diamond 1000. Ok, I see why. Water has 1/5th of the thermal conductivity of mineral oil. 50/50 water and antifreeze won't work. That raises the boiling point but ruins the thermal conductivity. Pure ethylene glycol looks tolerable. Other than the health and ecology issues, any reason that 100% antifreeze won't work? Sorry, I goofed. Vicodin etc. It should be the higher the W/mK, the better the thermal conductivity. So why is Fluorinert favored for cooling when it has such a lousy thermal conductivity? http://multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtnxTE5X46EVuQEcuZgVs 6EVs6E666666-- Since it's usually circulated with a pump and involves direct immersion, is it because of it's low viscosity and superior electrical characteristics? It would also appear that water has 5 times the thermal conductivity than mineral oil. So, why use mineral oil? It doesn't turn to steam or otherwise evaporate. Dave WD9BDZ |
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