带肋方腔中单极注入诱导的电对流数值模拟研究
Numerical Investigation of Electro-convection Induced by Unipolar Injection in a Finned Cavity
彭权 1周鑫 2王宏 1朱恂 1陈蓉 1丁玉栋 1廖强1
作者信息
- 1. 低品位能源利用技术及系统教育部重点实验室;重庆大学工程热物理研究所,重庆 400030
- 2. 重庆大学工程热物理研究所,重庆 400030
- 折叠
摘要
本文设计了带不同形状肋片的二维方腔电对流物理模型,基于OpenFOAM的FVM框架耦合求解Navier-Stokes方程、电势的Poisson方程以及电荷守恒方程,研究了带肋方腔电对流的形成机制及流动特性.研究结果表明:带肋方腔肋片表面因电场强度较大成为主要的电荷注入区域,最终形成了中轴线处的电羽流以及两侧对称的电荷空白区,流场为主体双涡对称、四角分布角涡;随着电瑞利数T的增大,电对流强度提高,当T超过某一阈值Tc时,电对流流型从稳定状态转变为不稳定状态;在强化电对流和稳定流型方面,带矩形肋方腔均具有最优性能,其电对流强度比带三角肋方腔提高了12.8％.
Abstract
A two-dimensional physical model in a cavity with different fins is designed for char-acteristics of electro-convection.The coupling of the navier-stokes equations,the poisson equation for the electric potential,and the charge conservation equation are solved in the OpenFOAM FVM framework.The results show that the surface of the fin becomes the main area of charge injection due to the large electric field intensity,and finally forms the electric plume at the central axis and symmetrical charge void region at two sides of the cavity.Two symmetrical vortexes in main region and small vortexes in four corners are observed.The intensity of electro-convection increases with the electric Rayleigh number T.When T exceeds a specific threshold Tc,the electro-convection pattern changes to an unstable state.The rectangular finned cavity behaves best in terms of strengthening convection and stabilizing flow pattern,whose electro-convection intensity is 12.8％higher than that of the triangular finned cavity.
关键词
单极注入/电对流/数值模拟Key words
unipolar injection/electro-convection/numerical simulation引用本文复制引用
基金项目
国家自然科学基金面上项目(52176056)
国家自然科学基金创新研究群体项目(52021004)
结冰与防除冰重点实验室开放课题资助(IADL20200303)
出版年
2024
NETL
NSTL
维普
万方数据