小槽道重力热管传热特性的实验研究

论文总字数：25945字

摘 要

微槽道重力热管导热特性好、结构简单，重量轻，体积小，无移动部件，可在微重力条件下稳定工作，被广泛应用于散热微电子元件。但在实际工程应用中，热管往往是处在一定的倾角下工作，目前国内针对倾角对铝-乙醇微槽道重力热管传热性能影响的实验研究还比较少。因此本文设计并制作了一整套具有微槽道重力热管的实验研究系统，通过控制变量法改变热管的工作倾角和热负荷，测试不同倾角、不同热负荷下热管正常工作的稳态温度分布和热阻、等效传热系数，为了得出热管的传热性能与热负荷及倾角之间的相关结论。

本文针对微槽道重力热管传热特性的实验研究主要分为两个部分：一是通过数据采集仪实时测量热管蒸发段、绝热段和冷凝段的温度得出不同倾角下的热管工作热阻和等效传热系数，进而分析热管传热性能与热负荷和工作倾角的关系；二是得到热管从施加热负荷到稳定工作期间蒸发段、绝热段和冷凝段的温度变化曲线。

通过本次实验，得出以下结论：（1）从热阻和等效传热系数两个热性参数分别分析热负荷及工作倾角对微槽道重力热管传热性能的影响。两者得出的结论是一致的。外部热源的热负荷越大，热管的热阻越小，等效传热系数越大，热性能越好。（2）热负荷和工作倾角对温度的升高速率以及最终达到的稳定温度都有很大的影响，但不同工况下热管的温度变化曲线相差不大。

关键词：微槽道；重力热管；倾角；传热特性

Experimental study on heat transfer characteristics of micro-grooved gravity heat pipe

Abstract

The micro-grooved gravity heat pipe has good thermal conductivity, simple structure, light weight, small volume, no moving parts, stable operation under microgravity conditions, and is widely used in heat dissipating microelectronic components. However, in practical engineering applications, the heat pipe is often operated at a certain tilt angle. At present, there are few experimental studies on the influence of the inclination angle on the heat transfer performance of the aluminum-ethanol microchannel gravity heat pipe. Therefore, this paper designs a set of experimental research system with micro-grooved gravity heat pipe. By changing the working inclination and heat load of the heat pipe, the steady temperature distribution and thermal resistance and equivalent heat transfer coefficient of the heat pipe under different dip angles and different heat loads are tested. The conclusions between the heat transfer performance of the heat pipe and the heat load and the tilt angle are obtained.

Through this experiment, the following conclusions are drawn: (1) The effects of thermal load and working inclination on the heat transfer performance of the micro-grooved gravity heat pipe are analyzed from the two thermal parameters of thermal resistance and equivalent heat transfer coefficient. The conclusions drawn by the two are consistent. The greater the thermal load of the external heat source, the smaller the thermal resistance of the heat pipe, the greater the equivalent heat transfer coefficient, and the better the thermal performance. (2) The heat load and the working tilt angles have a great influence on the temperature increase rate and the final stable temperature, but the temperature curves of the heat pipes under different working conditions are not much different.

Key words: micro groove; gravity heat pipes; tilt angle; heat transfer characteristics

目 录

摘要Ⅰ

关键词Ⅰ

AbstractⅡ

Key wordsⅡ

目录Ⅲ

第一章 绪论1

1.1课题研究背景1

1.2微槽道结构热管概述2

1.2.1微热管2

1.2.2微槽道结构热管3

1.3微槽道重力热管研究现状4

1.4本文的研究内容6

1.5本章小结6

第二章 微槽道重力热管传热特性的实验研究8

2.1实验原理8

2.2实验系统的设计及制作8

2.3实验步骤12

2.3.1热管充液12

2.3.2微槽道重力热管传热特性实验研究13

2.4实验数据处理及误差分析13

2.4.1实验数据处理14

2.4.2误差分析15

2.5实验结果分析16

2.5.1微槽道重力热管不同工况下的传热性能参数分析16

2.5.2不同工况下，微槽道重力热管的温度变化曲线20

2.6本章小结25

第三章 实验总结与展望27

3.1实验总结27

3.2展望27

致谢29

参考文献30

第一章 绪论

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