SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (3): 243-251.DOI: 10.1016/S1004-9541(14)60041-0

• 流体力学与传递现象 •    下一篇

Effects of Shape and Quantity of Helical Baffle on the Shell-side Heat Transfer and Flow Performance of Heat Exchangers

杜文静, 王红福, 程林   

  1. Institute of Thermal Science & Technology, Shandong University, Jinan 250061, China
  • 收稿日期:2013-06-08 修回日期:2013-10-05 出版日期:2014-03-28 发布日期:2014-03-05
  • 通讯作者: CHENG Lin
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51106090), the National Key Basic Research Program of China (2013CB228305) and the Independent Innovation Foundation of Shandong University (2012TS190).

Effects of Shape and Quantity of Helical Baffle on the Shell-side Heat Transfer and Flow Performance of Heat Exchangers

DU Wenjing, WANG Hongfu, CHENG Lin   

  1. Institute of Thermal Science & Technology, Shandong University, Jinan 250061, China
  • Received:2013-06-08 Revised:2013-10-05 Online:2014-03-28 Published:2014-03-05
  • Contact: CHENG Lin
  • Supported by:

    Supported by the National Natural Science Foundation of China (51106090), the National Key Basic Research Program of China (2013CB228305) and the Independent Innovation Foundation of Shandong University (2012TS190).

摘要: Shape and quantity of helical baffles have great impact on the shell-side performance of helical baffled heat exchangers (HBHE). In this work, three physical models of HBHE with baffles of different shape (trisection, quadrant and sextant sector) were investigated. Numerical simulations were performed on HBHE at three helix angles (10°, 25° and 40°) by the software ANSYS CFX. Analyses of numerical results indicate that the sextant HBHE shows relatively better fluid flow performance because the leakage flow in the triangle area is evidently reduced and the fluid streamline appears much closer to an ideal spiral flow, while the trisection and quadrant HBHE show more scattered and disordered streamline distributions. The convective heat transfer coefficient and pressure drop in three types of HBHE were presented. Further investigations on the shell side performance with different helical baffles were implemented by the field synergy theory. Both theoretical and numerical analyses gave support on the relations between helical baffle shape and shell-side performance. This paper may provide useful reference for the selection of baffle shape and quantity in HBHE.

关键词: helical baffled heat exchanger, trisection, quadrant, sextant, field synergy principle

Abstract: Shape and quantity of helical baffles have great impact on the shell-side performance of helical baffled heat exchangers (HBHE). In this work, three physical models of HBHE with baffles of different shape (trisection, quadrant and sextant sector) were investigated. Numerical simulations were performed on HBHE at three helix angles (10°, 25° and 40°) by the software ANSYS CFX. Analyses of numerical results indicate that the sextant HBHE shows relatively better fluid flow performance because the leakage flow in the triangle area is evidently reduced and the fluid streamline appears much closer to an ideal spiral flow, while the trisection and quadrant HBHE show more scattered and disordered streamline distributions. The convective heat transfer coefficient and pressure drop in three types of HBHE were presented. Further investigations on the shell side performance with different helical baffles were implemented by the field synergy theory. Both theoretical and numerical analyses gave support on the relations between helical baffle shape and shell-side performance. This paper may provide useful reference for the selection of baffle shape and quantity in HBHE.

Key words: helical baffled heat exchanger, trisection, quadrant, sextant, field synergy principle