摘要微通道的沸腾换热是近年来的研究热点之一，这种换热的尺度小，具有非常高的换热特性。因为微通道的研究尺度很小，无论是对于实验观察还是模拟分析都带来了不小的困难，微尺度通道一点点因素的改变，可能导致整个通道内产生巨大的改变，但微通道内的沸腾换热的研究仍不够充分，还需要进一步地实验研究。本次的课题研究中，进行了组装气液两相流的微通道沸腾换热实验系统，研究通道表面的温度分布，流体在通道内沸腾时的干度与对流换热系数的变化规律，运用有限元仿真 ANSYS 软件，对实验所用的微通道模块建立模型，用 Fluent 进行了模拟，得出了流场和通道表面的温度分布，对比模拟与实验得到的通道表面温度，验证了建立的模型能够模拟本课题的实验。27091
毕业论文关键词 微通道 流动沸腾换热 有限元仿真
Title Enhancement characteristic research of boiling heat transfer inside the micro-channel
Abstract
The boiling heat transfer of the micro-channel is the hot topic of research over
the past years. Such type of heat transfer is conducted within a small scope and
thus boasts extremely high heat transfer characteristics. As the research scope
of the micro-channel is small, experimental observation and simulation analysis
are confronted with great difficulties. The small change of a single factor of
micro-channel might generate tremendous change on the whole channel. However, the
research on the boiling heat transfer within the micro-channel is not sufficient
enough and further experimental research should be carried out. In this subject
research, it develops the micro-channel boiling heat transfer experimental system
of the package gas-liquid two-phase. It studies the temperature distribution on
the surface of the micro-channel, the dryness of the fluid during the boiling
process within the micro-channel and the change principles of the convective heat
transfer coefficient. It makes use of the finite-element simulation ANSYS software
to establish model for the experiment-wise micro-channel module. It conducts
simulation with Fluent to get the temperature distribution of the flow field and
the micro-channel surface and compares the micro-channel surface temperature of
simulation with that of experiment. In this way, it verifies that the established
model could simulate the experiment of this subject.
Keywords Micro-channel Fluid flow boiling heat transfer ANSYS
目 次
1 绪论· 1
1.1 研究背景及意义1
1.2 微通道的实验研究成果·2
1.2.1 微通道沸腾换热国内外研究状况 2
1.2.2 流动沸腾换热关联式的研究 3
1.3 课题的目的与工作内容·4
2 微通道内沸腾流动及换热实验研究6
2.1 实验装置和设备6
2.2 实验原理及数据处理7
2.2.1 壁面温度·7
2.2.2 热流密度·8
2.2.3 热效率8
2.2.4 起沸点8
2.2.5 干度·9
2.2.6 对流换热系数·9
2.3 实验结果· 9
3 微通道数值模拟计算·15
3.1 ANSYS 软件· 15
3.1.1 软件简介· 15
3.1.2 Fluent 模块中的有限体积法· 15
3.2 两相流与传热基本方程· 16
3.2.1 CFD 基本方程 16
3.2.2 流体湍流模型· 17
3.3 微通道中的对流换热模型 17
3.4 微通道模型与网格划分· 18
3.5 数值模拟结果· 19
结 论· 21
致 谢· 23
参考文献24
1 绪论
随着现代科技的发展、机械工艺水平的提升和实际生产时更多的需求，对微通道内沸腾
换热强化传热特性的研究早已提上日程,传统的换热设备在向着更小、更高效的方向发展，微 微通道内沸腾换热强化传热特性研究:http://www.751com.cn/jixie/lunwen_21480.html