[1] Wang Weihan, Chen Yaping, Cao Ruibing, Shi Mingheng, et al. Analysis of secondary flow in shell-side channelof trisection helix heat exchangers [J]. Journal of Southeast University (English Edition), 2010, 26 (3): 426-430. [doi:10.3969/j.issn.1003-7985.2010.03.011]

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Analysis of secondary flow in shell-side channelof trisection helix heat exchangers()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 3

Page:

426-430

Research Field:

Energy and Power Engineering

Publishing date:

2010-09-30

Info

Title:

Analysis of secondary flow in shell-side channelof trisection helix heat exchangers

Author(s):

Wang Weihan;  Chen Yaping;  Cao Ruibing;  Shi Mingheng

School of Energy and Environment, Southeast University, Nanjing 210096, China

Keywords:

trisection helix heat exchangers;  secondary flow;  Dean vortices;  heat transfer enhancement;  flow field analysis

PACS:

TK124

DOI:

10.3969/j.issn.1003-7985.2010.03.011

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.

References:

[1] Gu Weizao, Shen Jiarui. Heat transfer enhancement [M]. Beijing: Science Press, 1990.(in Chinese)
[2] Lutcha J, Nemcansky J. Performance improvement of tubular heat exchangers by helical baffles [J]. Chemical Engineering Research & Design, 1990, 68(3): 263-270.
[3] Stehlik P, Nemcansky J, Kral D, et al. Comparison of correction factors for shell-and-tube heat exchangers with segmental or helical baffles [J]. Heat Transfer Engineering, 1994, 15(1): 55-65.
[4] Stehlik P, Wadekar V. Different strategies to improve industrial heat exchange [J]. Heat Transfer Engineering, 2002, 23(6): 36-48.
[5] Andrews M, Master B I. Three-dimensional modeling of a helix changer heat exchanger using CFD [J]. Heat Transfer Engineering, 2005, 26(6): 22-31.
[6] Master B I, Chunangad K S, Boxma A J, et al. Most frequently used heat exchangers from pioneering research to worldwide applications [J]. Heat Transfer Engineering, 2006, 27(6): 4-11.
[7] Song Xiaoping, Pei Zhizhong. Shell and tube heat exchanger with anti-short circuit spiral baffle plate [J]. Petro-Chemical Equipment Technology, 2007, 28(3): 13-17.(in Chinese)
[8] Chen Yaping. A novel helix baffled heat exchanger suitable for tube bundle arrangement with equilateral triangles [J]. Petro-Chemical Equipment, 2008, 37(6): 1-5.(in Chinese)
[9] Li Yanqing, Chen Yaping, Liu Huajin, et al. Correlation equation of heat transfer coefficient at shell-side of trisection baffled helix heat exchangers [J]. Journal of Southeast University:Natural Science Edition, 2010, 40(1): 149-153.(in Chinese)
[10] Zhang Jianfei, Li Xin, Wu Yang, et al. Numerical simulation of laminar and heat transfer in shell-and-tube heat exchanger with helical baffles [J]. Journal of Engineering Thermophysics, 2007, 28(5): 853-855.(in Chinese)
[11] Xu Baiping, Wang Mingwei, Jiang Nan, et al. Numerical simulation study on the heat exchanger in the shell-side of the heat exchangers with helical baffles [J]. Petroleum Processing and Petrochemicals, 2005, 36(10): 33-37.(in Chinese)
[12] Wang Chen, Sang Zhifu. Numerical study of shell-side flow of heat exchanger of different helical baffle [J]. Petroleum Machinery, 2008, 36(10): 12-16.(in Chinese)
[13] Lei Yonggang, Chu Pan, He Yaling, et al. Numerical simulation of heat transfer and resistance characteristics of the restricted outgoing flow in a spiral channel [J]. Engineering for Thermal Energy and Power, 2007, 22(6): 656-660.(in Chinese)
[14] Zhan Hanhui, Cheng Hao, Liu Jianwen, et al. Secondary flow theory [M]. Changsha: Central South University Press, 2006.(in Chinese)
[15] Kuakuvi D N, Moulin P, Charbit F. Dean vortices: a comparison of woven versus helical and straight hollow fiber membrane modules [J]. Journal of Membrane Science, 2000, 171(1): 59-65.
[16] Shih T H, Liou W W, Shabbir A, et al. New eddy-viscosity model for high Reynolds number turbulent flows—model development and validation [J]. Comput Fluids, 1995, 24(3): 227-238.

Memo

Memo:

Biographies: Wang Weihan(1981—), female, graduate; Chen Yaping(corresponding author), male, doctor, professor, ypgchen@sina.com.
Foundation items: 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).
Citation: Wang Weihan, Chen Yaping, Cao Ruibing, et al.Analysis of secondary flow in shell-side channel of trisection helix heat exchangers[J].Journal of Southeast University(English Edition), 2010, 26(3):426-430.

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