内置发热体的倾斜开口腔内自然对流数值模拟  

NUMERICAL SIMULATION OF NATURAL CONVECTION IN TILTED OPEN CAVITIES WITH A DISCRETE HEATER

作　　者：王治云[1] 杨茉[1] 章立新[1] 赵明[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《工程热物理学报》2009年第1期96-98,共3页Journal of Engineering Thermophysics

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

摘　　要：本文对具有一个内置发热体的二维倾斜开口方腔自然对流问题进行了数值模拟。计算参数取值为：Prandtl数0．7，Rayleigh数范围从10^3-10^8，倾斜角度从0°-90°。数值结果表明，流动形式根据开口界面底部流体的流向分为两种流动形式。平均Nusselt数为Rayleigh数的增函数，增幅亦随Rayleigh数的增加而增加。当Ra〈10^6时，平均Nusselt数受到φ的影响较小，当Ra≥10^6时，平均Nusselt数取得最大值的φ为45°。A numerical study has been carried out on laminar natural convection in a two-dimensional tilted open cavity with a discrete heater on its bottom. The relevant parameters are the Rayleigh Number from 103 to 10s, the Prandtl number, Pr=0.7, and the inclination angles, φ from 0° to 90°It is found that flow patterns can be divided into two categories based on the flow direction at the lower part of the aperture. The average Nusselt number is an increasing function of Rayleigh number. It isn＇t sensitive to φ for lower （〈 10^6） Rayleigh numbers and has maximum values with φ=45° for higher （≥10^6） Rayleigh numbers.

关 键 词：开口腔 自然对流 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]