R123工质作用下电场对气泡的作用
毕业论文关键词： EHD；均匀电场；R123；介电常数；数值模拟
Effect on Bubbles in Electric Field in R123 Working Fliuds
Abstract： For the difference of different working fluid strengthening heat-transferring, many of the previous research did some qualitative analysis from the perspective of the charge relaxation time that as the liquid charge relaxation time is shorter, EHD effect is more obvious. In fact, the permittivity of working fluid is a key parameter affecting the electric field distribution, for different working fluid, its electric field characteristic around bubbles is different. At the same time, in an electric field, the difference between the working fluid’s permittivity and the bubble’s will change the electric field distribution of the original, so that the electric field around the bubble characteristics change, thereby affecting the effect of EHD. Thus, this lecture to research the effect on the bubble affected by electric field under R123 refrigerant, by doing numerical simulation of the electric field around the bubble with R123 refrigerant in the uniform electric field, is necessary.
KeyWords: EHD (electro hydrodynamics); uniform electric field; R123; permittivity; numerical simulations
目 录
1. 绪论 1
1.1 课题选择目的和意义 1
1.2 强化沸腾传热技术的研究历程 1
1.3 EHD 强化沸腾换热的研究现状 2
1.4 EHD 强化沸腾换热的研究方向 2
1.4.1 基础性研究 2
1.4.2 实用性研究 2
1.5 EHD 强化传热的基本方程 3
1.6 EHD 强化传热的优点 6
2. 强化沸腾换热理论基础 6
2.1 电场气泡变化理论基础 6
2.2电场对气泡的作用 8
3. ANSYS软件的应用 10
3.1 简介 ANSYS 软件 10
3.1.1 软件技术种类 10
3.1.2 ANSYS软件优势 10
3.1.3 前处理模块 11
3.1.4 求解模块 12
3.1.5 后处理模块 13
3.2 电磁场有限元分析简介 13
3.2.1 电磁场基本概念 15
3.2.2 电磁场有限元分析 16
3.3 有限元法的计算步骤 17
3.3.1 构建模型 17
3.3.2 施加载荷计算 19
3.3.3 求解 19
3.3.4 后处理 19
4. 电场作用下工质对气泡的影响 21
4.1 物理问题描述 21
4.2 电场控制方程及边界条件 21
4.3 计算结果及分析 22
4.3.1 气泡周围电势的分布 22
4.3.2 气泡周围电场的分布 28
5. 结论 36
1. 电势的变化 36
2. 场强的变化 36
致谢 37
参考文献 37
上一篇：机械摩擦对粉尘点燃的实验研究