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<x-flowed>Don't forget that the sodium in this location is in a fully enclosed, sealed environment which means that as the temperature rises, so does the pressure inside the valve which affects the boiling temperature of the sodium.
Jeff '67 Sqbk
Jim Adney wrote:
A heat pipe works by boiling the working fluid, so it's the boiling point that's important. 900 C works out to about 1650 F, which would be bright yellow. I don't know for sure, but I really doubt that even exhaust valves work that hot.
I don't know what the effects of these elements might be on steel, but I can't help wondering why sodium was chosen for this application.
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