螺旋扭曲扁管管内湍流传热性能数值模拟  

Numerical simulation on heat transfer performance of turbulent flow in the twisted oval tube

作　　者：安方涛 卢玫[1] 

机构地区：[1]上海理工大学能源与动力工程学院热工程研究所,上海200093

出　　处：《能源工程》2016年第1期1-8,14,共9页Energy Engineering

基　　金：国家自然科学基金资助项目(51176126)

摘　　要：采用Realizable k-ε模型及周期性边界条件对螺旋扭曲扁管管内充分发展湍流流动与换热性能进行了数值模拟和理论分析,并且提出了螺旋扭曲扁管强化传热评价指标。通过建立不同规格的螺旋扭曲扁管几何模型,得出螺旋扭曲扁管的长短轴比a/b越大、扭曲比s/de越小,其强化传热综合性能就越好,与此同时,其流动阻力也会增大。随着Re数的增大,强化传热综合性能减弱。Theoretical analysis and numerical simulation were performed for the periodically fully developed fluid flow and heat transfer of the turbulent flow in the twisted oval tube with periodic boundary condition and Realized k-ε model,the evaluation criterion of the enhanced heat transfer on twisted oval tube also has been given. Different specifications geometric models of twisted oval tubes including the aspect ratio A / B and the distortion of twisted oval tube S / dewere established to analyze the performance in the tube side. The results showed that the heat transfer performance of twisted oval tube increased with the increasing of A / B and decreasing of S / de,but the flow resistance would also increase. The heat transfer performance of twisted oval tube decreased with the increasing of the Reynolds number.

关 键 词：螺旋扭曲扁管 湍流 周期性边界 Realizable k-ε模型 数值模拟 评价指标 强化传热 

分 类 号：TB657.5[一般工业技术—制冷工程]