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Influence of alternating V-rows tube layout on thermal-hydraulic characteristics of twisted elliptical tube heat exchangers

Gu, Huaduo LU ; Chen, Yaping ; Sundén, Bengt LU ; Wu, Jiafeng ; Song, Ning and Su, Jindong (2020) In International Journal of Heat and Mass Transfer 159.
Abstract

An innovative alternating V-rows triangular tube layout was devised for the twisted elliptical tube heat exchangers to enhance heat transfer between adjacent tubes. Under the same tube circumference, altogether eleven twisted elliptical tube heat exchangers with two tube layouts, diverse aspect ratios of twisted elliptical tubes and different twisted pitches were constructed and simulated, including five coupling-vortex schemes, five parallel-vortex schemes and a smooth round tube scheme R10.8. Water with constant physical properties was adopted as the working fluid. Shell-side Reynolds number varies from 2000 to 10,000. The results show that the concurrent flow and the irregular channel in coupling-vortex schemes, and the larger aspect... (More)

An innovative alternating V-rows triangular tube layout was devised for the twisted elliptical tube heat exchangers to enhance heat transfer between adjacent tubes. Under the same tube circumference, altogether eleven twisted elliptical tube heat exchangers with two tube layouts, diverse aspect ratios of twisted elliptical tubes and different twisted pitches were constructed and simulated, including five coupling-vortex schemes, five parallel-vortex schemes and a smooth round tube scheme R10.8. Water with constant physical properties was adopted as the working fluid. Shell-side Reynolds number varies from 2000 to 10,000. The results show that the concurrent flow and the irregular channel in coupling-vortex schemes, and the larger aspect ratio and the smaller twisted pitch of twisted elliptical tubes help intensify turbulence and secondary flow. Compared with R10.8, the averaged Nu and Nu·f−1/3 of coupling-vortex scheme C14.2S50 are improved by 132.8% and 47.1%, respectively. Under shorter twisted pitch, smaller aspect ratio and lower Reynolds number, coupling-vortex schemes can acquire superior heat transfer capability than corresponding parallel-vortex schemes but will not increase manufacturing cost. Compared with P12.3S50, the maximum and averaged Nu of C12.3S50 are increased by 9.5% and 7.8% while the maximum and averaged Nu·f−1/3 are increased by 6.4% and 4.9%.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alternating V-rows triangle tube layout, Coupling-vortex, Heat transfer enhancement, Spiral flow, Twisted elliptical tube heat exchangers
in
International Journal of Heat and Mass Transfer
volume
159
article number
120070
publisher
Pergamon Press Ltd.
external identifiers
  • scopus:85086712593
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2020.120070
language
English
LU publication?
yes
id
0bd2e5d7-b8e4-40c6-902b-135e50e6864b
date added to LUP
2020-07-07 09:23:25
date last changed
2021-01-06 08:44:10
@article{0bd2e5d7-b8e4-40c6-902b-135e50e6864b,
  abstract     = {<p>An innovative alternating V-rows triangular tube layout was devised for the twisted elliptical tube heat exchangers to enhance heat transfer between adjacent tubes. Under the same tube circumference, altogether eleven twisted elliptical tube heat exchangers with two tube layouts, diverse aspect ratios of twisted elliptical tubes and different twisted pitches were constructed and simulated, including five coupling-vortex schemes, five parallel-vortex schemes and a smooth round tube scheme R10.8. Water with constant physical properties was adopted as the working fluid. Shell-side Reynolds number varies from 2000 to 10,000. The results show that the concurrent flow and the irregular channel in coupling-vortex schemes, and the larger aspect ratio and the smaller twisted pitch of twisted elliptical tubes help intensify turbulence and secondary flow. Compared with R10.8, the averaged Nu and Nu·f<sup>−1/3</sup> of coupling-vortex scheme C14.2S50 are improved by 132.8% and 47.1%, respectively. Under shorter twisted pitch, smaller aspect ratio and lower Reynolds number, coupling-vortex schemes can acquire superior heat transfer capability than corresponding parallel-vortex schemes but will not increase manufacturing cost. Compared with P12.3S50, the maximum and averaged Nu of C12.3S50 are increased by 9.5% and 7.8% while the maximum and averaged Nu·f<sup>−1/3</sup> are increased by 6.4% and 4.9%.</p>},
  author       = {Gu, Huaduo and Chen, Yaping and Sundén, Bengt and Wu, Jiafeng and Song, Ning and Su, Jindong},
  issn         = {0017-9310},
  language     = {eng},
  publisher    = {Pergamon Press Ltd.},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Influence of alternating V-rows tube layout on thermal-hydraulic characteristics of twisted elliptical tube heat exchangers},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120070},
  doi          = {10.1016/j.ijheatmasstransfer.2020.120070},
  volume       = {159},
  year         = {2020},
}