R11工质作用下电场对气泡的作用
毕业论文关键词： 电水动力学；匀强电场；数值模拟；流场结构
Effect on Bubbles in Electric Field in R502 Working Fliuds
ABSTRACT ： EHD heat transfer enhancement (electro hydrodynamic) refers to a new mode applying an electirc field in the fluid of heat transfer surface and using electric field, flow field and temperature field of heat transfer enhancement interaction to achieve the purpose of actively strengthening heat transfer. In order to further explore the role and mechanism of applied electric field in bubble, This research focuses on the numerical simulation of the electric field distribution around the bubble that is under the uniform electric field. The working fluid used is R502. ANSYS is used to simulate the electric field distribution of the bubble under different uniform electric field. The top plate is respectively exerted 15kv, 20kv and 25kv direct-current high voltage electric field, the simulations is carried out when a bubble attaches,
departs or when the formation with partial attachment and departure of several bubbles. Electric field makes the bubble behavior characteristics and the motion law of change, which changes the flow field structure and contributes heat transfer strengthening, so bubbles play a core link function. While on account of inertaction between the elctric field and thermal flow field, the bubble behavior and movement law, etc, become a research, which is emphasis and difficulty in heat transfer technology of electric field.
KEYWORDS: EHD (electro hydrodynamics)；uniform electric field ；numerical simulations；flow field structure
目录
1.绪论.5
1.1 课题的目的和意义 5
1.2 国内外研究现状与水平 5
1.3 强化沸腾传热技术的研究历程.6
1.4 强化沸腾换热的研究方向 6
1.4.1 基础性研究.7
1.4.2 实用性研究.7
1.5 R11工质参数介绍7
2.EHD强化沸腾传热的机理分析9
2.1 EHD力对气液界面的作用.11
3.ANSYS 软件的应用13
3.1 简介ANSYS 软件.13
3.2 技术种类13
3.3 软件开发应用14
3.3.1 能实现电子设备的互联14
3.3.2 仿真各种类型的结构材料14
3.3.3 简化复杂流体动力学工程问题14
3.3.4 基于模型的系统和嵌入式软件开发. 15
3.4 分析类型15
3.5 前处理16
3.5.1 实体建模. 16
3.5.2 网络划分17
3.5.3 施加载荷17
3.6 后处理17
3.7 电磁场的有限元分析18
3.8 有限元法的计算步骤19
3.8.1 构建模型19
3.8.2 施加载荷计算20
3.8.3 求解20
3.8.4 后处理20
4.软件模拟图及计算结果分析22
4.1 气泡周围的电势分布. 22
5.结论37
5.1电势的变化 37
5.2 场强的变化. 37
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