仿叶脉分形结构在均热板蒸发端的实验研究  

Experimental Investigation into Leaf-Vein-Like Fractal Structure Applied to Evaporation of Vapor Chamber

作　　者：刘旺玉[1] 王力[1] 罗远强[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2017年第1期118-122,128,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51375169)~~

摘　　要：基于植物叶片蒸腾作用带走大量热的特性,提出了新型仿叶脉分形结构用以优化均热板的热结构,研究了叶片叶脉分形结构吸液芯在蒸发端的传热效果,通过化学腐蚀制作均热板进行试验,分析均热板蒸发端底板下表面与腔内蒸汽温度的温差变化情况并计算各部分的热阻,比较仿叶脉分形结构吸液芯在4种分形角度(30°、40°、50°、60°)时的热特性.实验结果表明,分形角度为40°与50°的结构温差变化不大,均小于分形角度为30°与60°的结构,即其结构热阻更小,工质传热与输送性能更好.Due to the fact that the transpiration of plant leaves takes away a large amount of heat, a new leaf-vein-like fractal structure is designed to optimize the thermal structure of vapor chambers, and the heat transfer effect of a leaf-vein-like fractal structure wick in the evaporation of vapor chambers is investigated. Then, by preparing a vapor chamber through chemical etching to perform a thermal experiment, the changes of the temperature difference between the bottom surface of the evaporation and the steam in the vapor chamber are discussed, and the thermal resistance of each part is calculated. Moreover, the thermal characteristics of the wick at the fractal angles of 30°, 40°, 50° and 60° are compared. The results indicate that the structures of the fractal angles of 40° and 50° have almost the same thermal performance, and the performance is better than those at the fractal angles of 30° and 60°, which means that smaller thermal resistance brings about better heat transfer and flow behaviors.

关 键 词：均热板 仿叶脉分形结构 传热 

分 类 号：TK172[动力工程及工程热物理—热能工程]