Pulsating heat pipe

Passive Two-Phase Solution
A schematic representation of a pulsating heat pipe

Working principle

We let pressure do the work !

In a closed loop, heat is transferred from heat source(s) (the evaporator), to the condenser by self-started/sustained flow. When heat is applied, fluid partially evaporates in nucleation sites inside a serpentine. Small masses of liquid are converted to much lighter vapor, exerting positive pressure on neighboring fluid when expanding. Inversely, contraction of vapor into heavier liquid in the condenser applies suction to neighboring fluid. These frequent imbalances in pressure sustains the flow and give this disruptive technology its name, removing the need for mechanical drivers.

An icon of a pressure gauge.

Pulsating Heat Pipes (PHP) pressure-driven cooling can operate in earth, micro and hyper gravity, in any orientation

An animation showing the operation principle of pulsating heat pipes.

Passive two-phase cooling refers to the cooling of components using a working fluid that undergoes phase change and has self-sustained motion driven by the application/extraction of heat.

Icon no power needed.


Pulsating Heat Pipes consist of three main sections, as described below.
Evaporator ZONE(S)
Here heat enters the system, where it is transferred from the heat source(s) into the working fluid, resulting in partial evaporation. Microchannel evaporators are typically used for the serpentine, depending on the target cooling capacity
A schematic representation of the evaporator side in a pulsating heat pipe
Adiabatic Zone
Here the pulsating two-phase flow transfers heat from the evaporator zone to the condenser zone
Icon of a bended tube
Condenser Zone
Here heat exits the system. It is removed by the coolant, resulting in partial or total condensation of the working fluid. The condenser can be cooled by natural or forced convection with air, gas or liquid
A schematic representation of a liquid-cooled condenser in a pulsating heat pipe
A schematic representation of an air-cooled condenser


Portable Electronics
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  • Smartphones
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Computer & IT
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  • 5G Stations
  • CPUs
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  • GPUs
Aircraft & Aerospace
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  • IGBTs
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  • Diodes