Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones

doi:10.1016/j.cjche.2019.07.006

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (12): 2892-2899.DOI: 10.1016/j.cjche.2019.07.006

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones

Yaping Chen¹, Hongling Tang^1,2, Jiafeng Wu¹, Huaduo Gu¹, Shifan Yang¹

1 Engineering Research Center of BEEE, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
2 Hefei Yidu Education Consulting Co. Ltd, TAL Education Group, Hefei 230031, China

收稿日期:2019-01-26 修回日期:2019-05-13 出版日期:2019-12-28 发布日期:2020-03-17
通讯作者: Yaping Chen
基金资助:
Supported by the National Natural Science Foundation of China (51776035).

Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones

Yaping Chen¹, Hongling Tang^1,2, Jiafeng Wu¹, Huaduo Gu¹, Shifan Yang¹

1 Engineering Research Center of BEEE, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
2 Hefei Yidu Education Consulting Co. Ltd, TAL Education Group, Hefei 230031, China

Received:2019-01-26 Revised:2019-05-13 Online:2019-12-28 Published:2020-03-17
Contact: Yaping Chen
Supported by:
Supported by the National Natural Science Foundation of China (51776035).

摘要/Abstract

摘要： The shell side flow fields of both sextant and trisection helical baffle heat exchangers are presented on meridian and multilayer hexagon slices. It verifies that the performance of sextant schemes is better than those of the other kinds of helical baffle heat exchangers. The main mechanisms are due to the restricted leakage flow in the minimized gaps with increased baffle number and by one row of tubes dampen the leakage flow in the circumferential overlapped area of the adjacent helical baffles. The performance features were simulated on two different angled sextant helical heat exchangers and each compared with two trisection ones of either identical helical pitch or identical incline angle. The results verified that the performances of helical heat exchangers are mainly determined by the helical pitch rather than the baffle incline angle. The average values of comprehensive index h_oΔp_o^-1/3 of the trisection helical schemes T-24.1° and T-29.7° are correspondingly 3.47% and 3.34% lower than those of the sextant ones X-20° and X-25° with identical helical pitches. The comparison results show that the average values of shell side h.t.c. h_o and comprehensive index h_oΔp_o^-1/3 of the optimal dual helix sextant scheme DX30° are respectively 7.22% and 23.56% higher than those of the segment scheme S100.

关键词: Heat transfer, Computational fluid dynamics, Convection, Helical baffle heat exchangers, Sextant helical baffles

Abstract: The shell side flow fields of both sextant and trisection helical baffle heat exchangers are presented on meridian and multilayer hexagon slices. It verifies that the performance of sextant schemes is better than those of the other kinds of helical baffle heat exchangers. The main mechanisms are due to the restricted leakage flow in the minimized gaps with increased baffle number and by one row of tubes dampen the leakage flow in the circumferential overlapped area of the adjacent helical baffles. The performance features were simulated on two different angled sextant helical heat exchangers and each compared with two trisection ones of either identical helical pitch or identical incline angle. The results verified that the performances of helical heat exchangers are mainly determined by the helical pitch rather than the baffle incline angle. The average values of comprehensive index h_oΔp_o^-1/3 of the trisection helical schemes T-24.1° and T-29.7° are correspondingly 3.47% and 3.34% lower than those of the sextant ones X-20° and X-25° with identical helical pitches. The comparison results show that the average values of shell side h.t.c. h_o and comprehensive index h_oΔp_o^-1/3 of the optimal dual helix sextant scheme DX30° are respectively 7.22% and 23.56% higher than those of the segment scheme S100.

Key words: Heat transfer, Computational fluid dynamics, Convection, Helical baffle heat exchangers, Sextant helical baffles

Yaping Chen, Hongling Tang, Jiafeng Wu, Huaduo Gu, Shifan Yang. Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones[J]. 中国化学工程学报, 2019, 27(12): 2892-2899.

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.

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Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones

Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones

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