论文总字数：22641字

摘 要

作为热量传递中的过程设备，热交换器在工业领域中有着极为广泛的应用。因各种能源面临日益紧缺的局面，热交换器的合理设计、运转和改进对于节省资金、材料、能源和空间而言相当重要。热管换热器作为一种紧凑式换热器，且拥有很高的换热效率，在动力、化工、制冷等领域中有广泛的应用。

本文利用流体计算软件Icepak，通过改变翅片间距、翅片厚度和翅片高度，分析其对换热器的传热系数 h、传热热阻R 及压降影响。其中，选取迎面风速 2.0m/s、3.0m/s、4.0m/s、5.0m/s，不同翅片间距1mm、2mm、3mm、4mm，不同翅片厚度 0.4mm、0.6mm、0.8mm、1mm，不同翅片高度为6mm、8mm、10mm、12mm。计算结束后，对模型的温度场、速度矢量场、速度标量场以及压力场进行分析，以了解传热与流动情况。之后将后处理的 Re 数、Nu 数、传热系数 h、传热热阻等数据与各变量参数整理为折线图，以定性分析其影响。数值模拟结果表明: 随着迎面风速的增加, 表面传热系数和流动阻力显著增加，传热热阻减小; 随着翅片间距的增加，Nu 数减小，流动阻力减小;表面传热系数和流动阻力随翅片厚度的增加呈单调增加的趋势；随着翅片高度的增加，换热系数明显增加，传热热阻减小。本文数值模拟结果可为空冷器的设计与实验提供参考。

关键词 ：矩形翅片管 传热系数 数值模拟

Analysis on heat transfer o·n lined arrangement of heat pipe exchanger for dehumidification

ABSTRACT

The heat exchanger, a process equipment of heat transfer, is widely used in the industry. With the situation of shortage of all the energy, the reasonable design,operation and improvement of the heat exchanger is so important for saving money,materials, energy and space. As a kind of compact heat exchanger, the finned tube heat exchanger has a high efficiency of heat exchange and is widely used in the industry, such as power, chemical industry and refrigeration industry.

With changing one of the three variations, fin pitch, fin thickness and fin height,numerical simulation were performed with the help of the fluid calculation software, Icepak, to analyze the effects to the heat exchanger on the heat transfer coefficient, the heat transfer resistance and pressure drop. In the actual simulation process, the wind speed was set to 1.5m/s、2.0m/s、3.5m/s、4.5m/s、6.0m/s. The three variations were considered separately with fin pitch (1mm、2mm、3mm、4mm ), fin thickness (0.4mm、 0.6mm、0.8mm、 1mm) and fin height(6mm、8mm、10mm、12mm). After the calculation, some distribution maps,such as temperature field, the velocity vector field, speed scalar field and thepressure field, were read to analyze the performs of the heat transfer and flow.After all the simulation was done, drafting the Re number, Nu number, heat transfer coefficient h and heat transfer resistance R with the variable parameters into line graph forms made it convenient to analyze the three specific factors' influencing trend on finned tube exchanger.Numerical simulation results showed that both heat transfer coefficient and pressure drop increased with the increase of head wind air velocity, while the thermal resistance of R decreased. With the increasing of fin pitch, the Nu number and flow resistance both experience a decreasing process. The heat transfer coefficient and pressure drop increased with the increase of fin thickness. With the increasing of fin height, heat transfer coefficient ascend, while the heat transfer resistance R go through a decreasing process. The result s will provide a reference to the design and experiment of the air cooler.

Key words :rectangular fin; heat transfer coefficient; numerical simulation

目录

】摘要 I

ABSTRACT II

第一章 绪论 1

1.1热管换热器 1

1.1.1热管换热器简介 1

1.1.2 热管换热器的特点 1

1.1.3热管换热器的应用 2

1.1.4热管的维护与清灰 4

①延长热管使用寿命的措施 4

1.2除湿 4

1.2.1除湿材料的发展趋势及展望 4

1.2.2除湿技术 5

1.2.3除湿方法 5

1.2.4除湿的展望 5

1.2.5热管换热器在除湿方面的前景与展望 6

1.3整体矩形翅片 7

1.3.1翅片的导热传递 7

1.3.2矩形翅片的分析 7

第二章 翅片管模型建立 9

2.1Icepack 软件介绍 9

2.2 物理模型 10

2.3几何模型 11

2.4边界条件 12

2.5网格划分 13

第三章 数据处理及分析 16

3.1 对流传热问题完整的数学描述 16

3.2 理论计算 16

3.3 模拟结果后处理 18

3.3.1 相关定性参数的简化 18

3.3.2 计算所用参数的定义 19

3.4 模拟结果与理论结果 19

3.5模拟结果云图分析 20

3.6 模拟数据 27

第四章 换热器的设计 34

4.1设计题目: 34

4.2原始资料 34

4.3设计流程 34

第五章 结论与展望 41

5.1模拟结论 41

5.2未来展望 41

参考文献： 42

致谢 44

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