Heat pipe technology has been widely used in aerospace, military industry and other industries before. Since it was introduced into radiator manufacturing industry, people have changed the design idea of traditional radiator and got rid of the single heat dissipation mode that only relies on high air volume motor to obtain better heat dissipation effect. Heat pipe technology enables radiator to obtain the same heat even if it uses low speed and low air volume motor Satisfactory results have been achieved, resulting in a good solution to the noise problem that plagued the air-cooled heat dissipation and opened up a new field of heat dissipation industry. Now it's common on the heat sink of CPU. From a thermodynamic point of view, why do heat pipes have such good thermal conductivity? The heat absorption and heat release of objects are relative. When there is a temperature difference, the heat transfer from high temperature to low temperature is inevitable. From the three ways of heat transfer (radiation, convection, conduction), among them, the convection conduction is faster. The heat pipe is a phase change process that the medium condenses at the cold end after evaporation at the hot end (that is, the latent heat of evaporation and condensation of the liquid) to make the heat conduct rapidly. Generally, the heat pipe is composed of shell, wick and end cover. The inside of the heat pipe is pumped into a negative pressure state and filled with a proper liquid, which has a low boiling point and is easy to volatilize. The wall of the tube is provided with a liquid absorption core, which is composed of a capillary porous material. One end of the heat pipe is the evaporation end, and the other end is the condensation end. When one end of the heat pipe is heated, the liquid in the capillary vaporizes rapidly, and the steam flows to the other end under the power of thermal diffusion, and condenses at the cold end to release heat. The liquid flows back to the evaporation end along the porous material by capillary action, so the circulation continues until the temperature at both ends of the heat pipe is equal (at this time, the thermal diffusion of steam stops). This cycle is fast, and the heat can be transmitted continuously.