基于烟囱效应的电子设备自然散热设计  

Natural Cooling Design for Electronic Equipment Based on Chimney Effect

作　　者：吴进凯 钱吉裕[1] 魏涛[1] WU Jinkai;QIAN Jiyu;WEI Tao(Nanjing Research Institute of Electronics Technology,Nanjing 210039,China)

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《电子机械工程》2020年第6期42-45,共4页Electro-Mechanical Engineering

摘　　要：采用自然冷却的电子设备的换热性能与其散热结构有着密切的联系。为研究自然散热结构形式对换热性能的影响,采用FloEFD软件进行了数值计算和对比研究。为强化自然散热效果、降低热源温度,在不增加翅片重量的前提下,基于烟囱效应设计了一种曲面散热翅片结构。仿真结果表明,相比于竖直翅片,曲面翅片结构可有效利用入口效应增强自然对流换热,翅片与盖板结合形成的烟囱结构可有效提高自然对流流速,从而达到强化换热的目的。对直翅和曲面翅结构实验件进行了自然散热实测对比。结果表明,在相同发热条件下,优化后实验件的热源温度相比原结构降低3℃以上,可为电子设备的高效自然散热设计提供参考。The heat dissipation performance of natural air-cooling electronic device is closely related to its thermal structure.In this paper,the influence of fin structures of natural cooling on the performance of heat transfer are numerically investigated and compared by using FloEFD software.To enhance the natural heat transfer performance and decrease the temperature of heat sources,a cooling structure with curved surface fins is designed based on chimney effect,without increasing the fin weight.Simulation results show that compared with straight fin,the curved fin structure can effectively use the entrance effect to enhance the natural convection and heat transfer,the chimney structure formed by fins and cover plate can speed up the air flow,which is of great benefit to heat transfer.The heat transfer performance of the heat sinks with straight fins and curved fins are compared experimentally.The result indicates that under the same heating power,the heat source temperature decreases by more than 3℃after optimization.The study can provide a reference for efficient natural air-cooling design of electronic equipment.

关 键 词：自然散热 FloEFD 烟囱效应 翅片优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]