论文总字数：24121字

摘 要

工质热物性显著影响脉动热管的流动与传热特性。本文以水、乙醇、丙酮、R134a、R600为工质，研究不同工质热物性对脉动热管振荡传热性能的影响规律，并针对实验结果进行传热性能的初步理论分析。研究发现在同一充液率下，水、乙醇、丙酮、R134a、R600这五种工质的单位温升显热传热量、干度变化呈现先稳定到快速增加的趋势；R134a、R600单位温升潜热传热量呈先缓慢增加再快速增加的趋势，水、乙醇、丙酮缓慢增加；水、丙酮、R134a、R600无论在哪种充液率下，其单位温升显热传热量、总传热量先稳定在迅速增加，而乙醇则先缓慢增加再快速增加；水、乙醇、丙酮无论在哪种充液率下单位温升潜热传热量、干度变化呈现先稳定在缓慢增加，而R134a、R600则先缓慢增加再快速增加。乙醇热管和水热管的传热热阻随着加热功率的增加呈现先快速减小到趋于稳定的变化；脉动热管的传热主要是显热传热，显热传热量所占比例均超过60%；水热管的质量流量和流速随着加热功率的增加而增加，乙醇热管的质量流量和流速随着加热功率的增加先略微增加再略微减小再趋于平稳。

关键词：脉动热管；工质；热物性；传热性能

Abstract

Working fluid thermal properties significantly affect the flow and heat transfer characteristics of pulsating heat pipe.In this paper,water,ethanol,acetone,R134a,R600 are used as the working fluid and we study how the different working fluid thermal properties influence the oscillation heat transfer performance of pulsating heat pipe,and conduct a preliminary theoretical analysis of the experimental results of heat transfer performance.The study found that at the same filling rate,temperature sensible heat transfer,dryness change of ,R134a,R600 tend to be stable at first then rapidly increase;Unit temperature latent heat transfer of R134a and R600 are increased slowly at first and then trend to rapidly increasing,while water,ethanol,acetone are always increased slowly;whichever filling rate water,acetone,R134a,R600 are at,the unit temperature sensible heat transfer,total heat transfer were first steady then rapidly increase,while ethanol is increased slowly at first and then rapidly increase;Water,ethanol,acetone,no matter at which filling rate,per unit temperature rise of latent heat transfer,dryness change showed steady at first,then slowly increase,while R134a and R600 firstly slowly increase and then rapidly increase.With increasing heating power,thermal resistance of ethanol heat pipe and water heat pipe decreases rapidly at first then trend to be stabl;Heat transfer of pulsating heat pipe mainly rely on sensible heat and sensible heat transfer proportion is more than 60%;With the increasing og the heating power ,mass flow and flow rate of the water heat pipe increase, the mass flow and flow rate of ethanol heat pipe increase little and then decrease slightly and then stabilized.

Key words: Pulsating heat pipe;The working fluid;Thermal properties;

heat transfer performance

目录

摘要 ........................................................................................................Ⅰ

Abstract ...................................................................................................Ⅱ

目录.........................................................................................................Ⅲ

1. 绪论 ...........................................................................................1

1.1课题背景及意义 .........................................................................1

1.2脉动热管介绍及其应用现状 .....................................................2

1.2.1脉动热管简介 ....................................................................2

1.2.2脉动热管的工作原理 ........................................................2

1.2.3脉动热管的特点 ................................................................2

1.2.4影响脉动热管的工质物性 ................................................3

1.3课题研究现状 ………………………………………………….3

1.3.1实验研究现状 …………………………………………....3

1.3.2理论研究现状 …………………………………………....4

1.3.3小结 ……………………………………………………....5

1. 乙醇、水脉动热管传热性能实验结果分析 ...........................7

2.1实数据验处理 .............................................................................7

2.2实验结果分析 .............................................................................8

2.3热管内部流动传热性能分析......................................................10

2.4流动性能分析.............................................................................11

2.5小结.............................................................................................15

1. 脉动热管内部工质热力性能参数的计算与分析...................17

3.1单工质热物性对比.....................................................................17

3.2热管内工质热物参数的计算.....................................................20

3.3热物性参数对比分析.................................................................21

3.3.1不同工质、同种充液率....................................................21

3.3.2 同种工质、不同充液率...................................................31

3.4 小结............................................................................................46

1. 结论与展望 .............................................................................48

参考文献 ...............................................................................................50

致谢.........................................................................................................54

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