The development of row heat pipe radiators based on natural convection heat dissipation technology does not require moving parts, low cost and more reliable operation. Therefore, one of the purposes of this paper is to develop a device with the largest heat dissipation power under natural convection conditions. In view of this, a heat sink with a similar appearance to a common profile heat sink, which is actually based on heat pipe technology, is proposed. Row-type heat pipe radiator The new type of heat pipe radiator has a size of 150mm×120mm×120mm, the condensation end height is 100mm, and the evaporation end height is 20mm. The radiator is essentially a special-shaped heat pipe, and the evaporation end of the heat pipe is the lower evaporation chamber. The upper fin is the condensation end of the heat pipe, that is, each fin is hollow and communicates with the evaporation chamber.
Row heat pipe radiator The whole radiator is made of copper, and its condensation end is composed of 13 heat pipe fins. The inside of each heat pipe fin is a rectangular cavity of 3 mm × 106 mm × 99 mm, and the wall thickness of the heat pipe fin is 1 mm. The wall thickness of the evaporation end is 4 mm, and a cavity having an inner space of 142 mm × 108 mm × 16 mm is formed inside. A metal fiber felt having a thickness of 5 mm was laid on the bottom of the evaporation chamber. The working medium inside the radiator is water. Based on the unique advantages of the heat pipe itself in terms of temperature uniformity, heat transfer enhancement and high heat flux density, the heat pipe radiator has the following characteristics: 1) The uniform temperature of the heat pipe evaporation end is good, and the heat pipe evaporation surface is good. The diffusion heat resistance is small; 2) the heat pipe fin formed by the condensation end of the heat pipe replaces the fin heat dissipation of the conventional profile heat sink, so that the surface temperature of the whole fin is higher, and the natural convection heat transfer is strengthened; 3) the metal fiber felt is used for the heat pipe The wicking core increases the heat flux density that the evaporating surface of the heat pipe can withstand, and the radiator can be placed at multiple angles, thereby increasing the range of use of the heat pipe radiator.
The LED chip is mounted on the bottom surface of the evaporation end of the heat sink. When the LED is working, heat is transferred from the chip to the bottom of the evaporation end of the radiator. The working fluid in the wick of the evaporation end absorbs heat and evaporates, and the steam flows to the radiator under a slight pressure difference. In the condensation section, the heat is released and condensed into a liquid, and the liquid is refluxed at the evaporation end by gravity and uniformly distributed on the entire evaporation surface by the capillary action of the wick. The heat is transferred to the environment in a natural convection manner on the outer surface of the heat pipe fins at the condensation end.
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