Numerical investigation on combined single shell-pass shell-and-tube heat exchanger.pdf

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Numerical investigation on combined single shell-pass shell-and-tube heat exchanger.pdf

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Numerical investigation on combined single shell-pass shell-and-tube heat exchanger

International Journal of Heat and Mass Transfer 84 (2015) 103–113Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: www.elsevier .com/locate / i jhmtNumerical investigation on combined single shell-pass shell-and-tube heat exchanger with two-layer continuous helical baffles/10.1016/j.ijheatmasstransfer.2014.12.042 0017-9310/ 2014 Elsevier Ltd. All rights reserved. ? Corresponding author. Tel./fax: +86 29 E-mail addresses: yangjianfengchn@ (J.-F. Yang), zengmin@mail. (M. Zeng), wangqw@ (Q.-W. Wang). 1 Tel./fax: +86 29 2 Tel./fax: +86 29Jian-Feng Yang 1, Min Zeng 2, Qiu-Wang Wang ? Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China a r t i c l e i n f o a b s t r a c tArticle history: Received 13 March 2014 Received in revised form 14 December 2014 Accepted 15 December 2014 Available online 17 January 2015 Keywords: Two-layer continuous helical baffle Combined single shell-pass Shell-and-tube heat exchanger Comprehensive performance Maximal velocity ratioA novel combined single shell-pass shell-and-tube heat exchanger with two-layer continuous helical baf- fles (CSSP-STHX) has been proposed in the present study as an alternative solution of overcoming the drawbacks of the shell-and-tube heat exchanger with continuous helical baffles (CH-STHX). The shell- side baffles of CSSP-STHX are consisting of inner layer and outer layer continuous helical baffles, which are not on the same helical surface. There is no sleeve tube between inner and outer layers, thus complex flow field can be formed in the shell side which means inner layer fluid can rush out to the outer layer under the centrifugal force. Numerical simulations are carried out to compare thermo hydraulic perfor- mances of the three heat exchangers which are shell-and-tube heat exchanger with segmental baffles (SG-