摘要
利用热和流体流动控制方程,以温差驱动的二维同心圆环套管自然对流换热为对象,分析讨论了水在4℃附近密度反转特性对流动和传热的影响,设置了三种等温差方案,分别给出了流场和温度场,并分析了各自的传热与流动原因。分析结果表明:在不包括4℃的温度方案中,各自研究区域内均能得到一个完整的循环流动,但流动方向有所不同,同时在套管的壁面附近均存在较大的温度梯度,主流区温度梯度较小;在相同温差条件下,水的密度反转特性对于传热性能影响较大,在工程应用中,应该充分考虑水的密度反转特性。
Based on the natural convection heat transfer driven by temperature difference in two-dimensional casing pipe,by using control equations of heat and fluid flow,considering the effect of viscous dissipation,analyses the entropy generation distribution and variation.The results showed that entropy generation mainly occurs on high temperature wall and low temperature wall,the maximum of entropy generation occurs on the downside of high temperature wall and the upside of low temperature wall,total entropy generation,entropy generation by heat transfer is dominant and increases with bigger Ra.
出处
《水资源与水工程学报》
2011年第4期167-169,共3页
Journal of Water Resources and Water Engineering
关键词
同心圆环套管
自然对流
温度等值线
流线
传热性能
数值模拟
two-dimensional casing pipe
natural convection
temperature isogram
stream line
heat transfer character
numerical simulation
作者简介
作者简介:巩玉发(1963-),男,天津人,硕士,教授,主要从事流固耦合传热机理、计算流体动力学的研究,