开孔直径对铜纤维蜂窝骨架/复合相变材料温控性能影响研究OA

A new type of composite paraffin phase change material as a heat sink material for heat dissipation is proposed,and a heat dissipation test system is built using an LED lamp as the heat source.A temperature acquisition instrument is used to collect real-time temperature data.Under four input power conditions,three groups of samples are tested to draw relevant conclusions.In the initial heating stage,the bottom temperature of the copper fiber honeycomb framework/paraffin composite phase change material heat sink with a smaller opening diameter is higher than that of the heat sink with a larger opening diameter,and the temperature difference between the two gradually increases with the increase of the opening diameter.In the heat sink with a larger opening,the paraffin melts better and the center temperature rises faster.At an input power of 21.3 W,the temperature difference ΔT2 of the 3.7 mm opening is 5℃higher than that of the 2.5 mm opening diameter,and 4.1℃higher than that of the 3 mm opening diameter on average.Under the same opening rate conditions,the thermal control performance of the copper fiber honeycomb framework/paraffin composite phase change material heat sink with a smaller opening diameter is better,and the temperature control and cooling effect for the LED lamp are more prominent.The influence of the opening diameter on this type of heat sink is tested and an experimental basis for structural optimization is provided.