The heat pipe heat pipe is a heat transfer element with high thermal conductivity developed in the 1960s. It has a simple structure and its thermal conductivity is superior to that of a copper rod. It has the reputation of “superconductorâ€. A typical heat pipe consists of a casing and a wick. The working medium in the heat pipe absorbs heat in the evaporation section to produce phase-changing steam. The pressure difference in the pipe is the power flow to the condensation section, and the heat is condensed into a liquid and adsorbed in the wick. The capillary force in the wick is the return of the power to the evaporation section for cyclic heat dissipation. The traditional heat pipe is the same as the vapor and liquid, and the bending will lead to a drastic drop in heat dissipation performance.
The pulsating heat pipe is a new type of heat pipe that appeared in the early 1990s. It can bend more randomly like blood, and has great prospects in the application of small equipment. Cotter first proposed the concept of micro heat pipe in 1984. As the fastest growing heat pipe technology in the world, the pipe diameter can usually reach 1~2mm. A loop heat pipe is proposed, and a condenser is arranged at the upper end of the heat pipe to avoid the same vapor and liquid, compact structure and good heat dissipation performance. A heat pipe heat dissipation substrate with tunnel structure was designed, and the influence of the inclination angle of the heat pipe on the heat dissipation of the LED was obtained through experiments, which was consistent with the research results of Liu Zhaojun et al. As a new type of heat pipe, flat heat pipe has the advantages of high efficiency, uniform temperature and light weight. The flat heat pipe is generally made of two pieces of copper, and a sintered copper mesh is placed inside as a liquid absorbing core. The thermal paste is attached to the surface of the heat source to enhance heat dissipation by enlarging the heat dissipation area. Tan et al. found that the best single heat source location is at the center of the plate, and multiple heat sources need to be placed in the central axis symmetry to achieve the best heat dissipation. Although the flat heat pipe has good heat dissipation performance and compact structure, it needs to expand a two-dimensional heat dissipation surface, which is not suitable for the integrated high-power LED light source with a large heat source area. Therefore, if the heat pipe is used for the heat dissipation of the LED light source, it is necessary to The structure is expanded on the three-dimensional spatial level to realize the remote heat dissipation mode of sink source separation.
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