恒热流加热开口腔自然对流的可视化实验和数值模拟  

VISUALIZATION AND NUMERICAL SIMULATION OF NATURAL CONVECTION IN AN OPEN CAVITY WITH CONSTANT WALL HEAT FLUX

作　　者：王治云[1] 杨茉[1] 章立新[1] 孙佳明[1] 赵明[1] 

机构地区：[1]上海理工大学动力学院,上海200093

出　　处：《工程热物理学报》2007年第z2期109-111,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50576057);上海市教委发展基金项目资助(No.05EZ18)

摘　　要：本文采用激光全息干涉和激光片光照射烟可视化方法获得了恒热流加热的二维开口腔自然对流问题的温度场和流场,并进行了数值分析.实验结果与数值模拟结果吻合.数值计算表明方腔内流体的流通量与Ra*和深高比B有关,当Ra*＞104时随深高比B增加流通量增加;B×Nu与深高比B呈线性关系.利用B×Nu与深高比B的线性关系,通过引入当量导热系数λc,本文还给出了加热壁面的平均温度的简单计算方法.Natural convection in a two-dimensional open cavity with constant wall heat flux boundary conditions is studied experimentally and numerically.Temperature field within the open cavity is ob- tained through laser holographic interferometer,and the streamline patterns are visualized by injecting smoke into the cavity.The numerical results agree well with the experimental results.Calculation results indicate that the flow rate is affected by the aspect ratio B and Ra~*.The flow rate increases with B when Ra~* is greater than 10~4,and B×Nu has a linear relationship with B.Using the linear relationship between B×Nu and B,a simple method of calculating average temperature of the heat wall is present by introducing equivalent conductivity factorλ_c.

关 键 词：开口腔 自然对流 恒热流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]