叉指式散热器结构的优化设计

为了解决大功率器件的高热流密度问题,以数值计算的方法研究叉指式散热器内部流体的流动换热特性,验证广义温度梯度均匀化原则是强化对流换热的基本规律。分析钉柱高度、基座高度、钉柱个数和钉柱直径等几何参数对叉指式散热器综合散热性能的影响。采用有约束条件的遗传优化算法,以散热器热阻为目标函数,对散热器几何结构进行多参数优化,得到特定条件下能够强化换热的叉指式散热器较优几何结构。研究为散热器结构的优化设计提供了理论依据和计算数据。

Optimized Design for the Structure of Staggered Finger Shape Heat Sink

Aimed at solving the severe problem of chip which is caused by high density of heat flow rate,numeration study is made to simulate the flow and heat transfer characteristic in the staggered finger shape heat sink,and the generalized temperature gradient uniformity principle that could control the enhancement of heat transfer in the convective heat transfer process is validated.The heat transfer performance which effected by the main geometrical parameters such as the height of circular pin,the base height of heat sink,the number of circular pins and the diameter of circular pin are analyzed.The multi-parameter constraint optimization procedure(genetic algorithms) based on the objective of heat sink resistance is carried out to optimize the structure of staggered finger shape heat sink,and the optimal structure is obtained under given conditions.These results are beneficial to the design and improvement of heat sink configuration.