Heat transfer principle of heat pipes

The first step of heatpipe processing is to remove the internal air then injects the working fluid and to seal.

The vaporization temperature of the working fluid in the low pressure environment is greatly reduced.

The evaporation zone absorbs heat and then vaporizes rapidly. The steam moves to the condensation zone.

After exchanging heat with the external heat source, it condenses into a liquid state, and then flows back to the evaporation zone by gravity or pressure difference between the capillary wall and the wall, and the cycle is repeated. With the principle of two changes in fluid, the coefficient of heat transfer is about 50 to 100 times that of pure aluminum.