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

doi:10.1016/S1004-9541(14)60041-0

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (3): 243-251.DOI: 10.1016/S1004-9541(14)60041-0

• FLUID DYNAMICS AND TRANSPORT PHENOMENA • Next Articles

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

Institute of Thermal Science & Technology, Shandong University, Jinan 250061, China

Received:2013-06-08 Revised:2013-10-05 Online:2014-03-05 Published:2014-03-28
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).

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

Institute of Thermal Science & Technology, Shandong University, Jinan 250061, China

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).

Abstract

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

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

DU Wenjing, WANG Hongfu, CHENG Lin. Effects of Shape and Quantity of Helical Baffle on the Shell-side Heat Transfer and Flow Performance of Heat Exchangers[J]. Chin.J.Chem.Eng., 2014, 22(3): 243-251.

杜文静, 王红福, 程林. Effects of Shape and Quantity of Helical Baffle on the Shell-side Heat Transfer and Flow Performance of Heat Exchangers[J]. Chinese Journal of Chemical Engineering, 2014, 22(3): 243-251.

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[1]	Yaping Chen, Hongling Tang, Jiafeng Wu, Huaduo Gu, Shifan Yang. Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones [J]. Chinese Journal of Chemical Engineering, 2019, 27(12): 2892-2899.
[2]	Cong Dong, Yaping Chen, Jiafeng Wu . Comparison of heat transfer performances of helix baffled heat exchangers with different baffle configurations [J]. Chin.J.Chem.Eng., 2015, 23(1): 255-261.

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

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

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