A mechanically pumped heat pipe having an evaporator section and a condenser section disposed at a location below the evaporator section. A solenoid actuated cavitation-free mechanical pump returns a working fluid from the condenser section to the evaporator section. An armature connected to the piston head of the mechanical pump is disposed inside the condenser section and the solenoid coil is disposed outside of the condenser section in the vicinity of the armature permits the piston head to be periodically reciprocated without any electrical or mechanical feedthroughs.
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