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Originally Posted by Roscal
It's a thermosyphon, not a heat-pipe (no capillary action, just gravity for flow return)
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Thermosyphon as in like this?
http://devitec.de/thermosiphon.htm
If so, then it's not phase-changing.
If it is involving a phase-change action, then it is still just a heat-pipe, but is just one that appears to not have a wicking structure and instead relies on gravity for coolant return. That sort of thing is a heat-pipe too, and is what the first heat-pipes used to do. The capillary wicking thing is a later development in heat-pipe advances.