- Heat transfer begins when one end of the heat pipe is placed at a higher temp
e other end is at a lower temperature. The heat first passes through the metal tube wall into the capillary object from the high temperature, and the working fluid in the capillary object is heated and begins to evaporate. The part of the heat pipe at high temperatures is called the evaporator part. The vapor after evaporation collects in the hollow tube of the evaporation section and flows to the other end of the heat pipe. Since the other end of the heat pipe comes into contact with the lower temperature , condensation begins when the vapor reaches the cooler end , at which point the heat passes through the capillary object , the working fluid and the metal tube wall to the lower temperature part. Therefore, the heat pipe in the lower temperature part is called the condenser. In the condensation part, the vapor originally evaporated by the evaporation part condensed into a liquid, and these condensed liquids flowed back to the evaporation part from the condensed part due to the capillary pumping, so that the fluid circulates endlessly, and the heat is transferred from the high temperature to the low temperature, which is the heat transfer principle of the heat pipe.