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How much liquid do I need inside of a heatpipe?

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New Member
Jun 19, 2016
guys please help me with the quantity of fluid (in ml) to be used in heat pipe with the following specifications:
working fluid: Acetone
temperature range : 30-60 deg Celsius
wall materiel: copper
od of pipe: 20mm
wall thickness: 0.5mm
wick structure: sintered wick with 1.5mm thickness


Gulper Nozzle Co-Owner
Dec 15, 2008
This is a 12 year old thread... I have started your own by splitting from the old thread.


dBa Member
Mar 1, 2013
Enough to fill the evaporator (hot) end, but not back up into the condenser (cool) end. The tricky part is adding the correct amount right after pulling a vacuum since the hoses in the setup will hold more charge than a little heat pipe.