东南大学学报（英文版）2010，Vol.26Issue(3)：426-430,5.
三分螺旋折流板换热器壳侧通道二次流分析
Analysis of secondary flow in shell-side channel of trisection helix heat exchangers
摘要
Abstract
The flow characteristics of shell-side fluid in the tube-and-shell heat exchangers with trisection helical baffles with 35° inclined angles are numerically analyzed. The secondary flow distribution of the fluid in the shell-side channel is focused on. The results on meridian planes indicate that in the shell-side channel, the center part of fluid has an outward tendency because of the centrifugal force, and the peripheral region fluid has an inward tendency under the centripetal force. So in a spiral cycle, the fluid is divided into the upper and lower beams of streamlines, at the same time the Dean vortices are formed near the left baffle, and then the fluid turns to centripetal flow near the right baffle. Finally the two beams of streamlines merge in the main flow. The results of a number of parallel slices between two parallel baffles with the same sector in a swirl cycle also show the existence of the secondary flow and some backward flows at the V-gaps of the adjacent baffles. The secondary flows have a positive effect on mixing fluid by promoting the momentum and mass exchange between fluid particles near the tube wall and in the main stream, and thus they will enhance the heat transfer of the helix heat exchanger.关键词
三分螺旋折流板换热器/二次流/迪恩涡/强化传热/流场分析Key words
trisection helix heat exchangers/secondary flow/Dean vortices/heat transfer enhancement/flow field analysis分类
能源科技引用本文复制引用
王伟晗,陈亚平,操瑞兵,施明恒..三分螺旋折流板换热器壳侧通道二次流分析[J].东南大学学报（英文版）,2010,26(3):426-430,5.基金项目
The National Natural Science Foundation of China (No.50976022), the National Key Technology R＆ D Program of China during the 11th Five-Year Plan Period (No.2008BAJ12B02). （No.50976022）
