摘要
为研究自然对流流动和换热的实质,对重力场中自然对流的驱动力进行了进一步分析,提出了自然对流产生的充分必要条件。以二维封闭方腔内空气自然对流为对象,分别对三种不同的自然对流形式进行了数值模拟。结果表明:只要流体所受体积力为非保守力,即可产生自然对流。这为自然对流的控制提供了一定的理论依据。
To investigate the flow and heat transfer of natural convection, the driving force for the gravitational natural convection is analyzed. The necessary and sufficient condition that natural convection arises is presented. Three types of air natural convections in a two-dimensional square enclosure are numerically simulated. The results show that natural convection can be formed on condition that the body force acting on the fluid is a non-conservative one. This is helpful for the control of natural convection.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2003年第6期998-1000,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划资助项目(No.G2000026302)
关键词
自然对流
非保守力
体积力
浮升力
natural convection
non-conservative force
body force
buoyancy force
