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Performance investigation on twisted elliptical tube heat exchangers with coupling-vortex square tube layout

Gu, Huaduo LU ; Chen, Yaping ; Wu, Jiafeng and Sunden, Bengt LU (2020) In International Journal of Heat and Mass Transfer 151.
Abstract

The twisted elliptical tube heat exchangers with the novel coupling-vortex chessboard tube layout (TETHXs-CV) were simulated with the RNG k-ε model in software Fluent 15.0. The shell-side flow pattern at the tangential points between adjacent tubes in traditional TETHX is countercurrent while that in TETHX-CV is concurrent, which helps enhance heat transfer capability without any extra manufacturing cost. The impacts of the ratio A/B of the major axis to the minor axis and the twist pitch S were also investigated. The results indicate that with the increase of A/B and the decrease of S, the secondary flow behaves more intensely, the Nusselt number Nu and the friction factor f increase, while with the increase of A/B and S, the... (More)

The twisted elliptical tube heat exchangers with the novel coupling-vortex chessboard tube layout (TETHXs-CV) were simulated with the RNG k-ε model in software Fluent 15.0. The shell-side flow pattern at the tangential points between adjacent tubes in traditional TETHX is countercurrent while that in TETHX-CV is concurrent, which helps enhance heat transfer capability without any extra manufacturing cost. The impacts of the ratio A/B of the major axis to the minor axis and the twist pitch S were also investigated. The results indicate that with the increase of A/B and the decrease of S, the secondary flow behaves more intensely, the Nusselt number Nu and the friction factor f increase, while with the increase of A/B and S, the comprehensive evaluation index Nu∙f−1/3 increases. The Nu, f and Nu∙f−1/3 of all twisted tube schemes are higher than those of the smooth round tube schemes R10.8. Compared with corresponding parallel-vortex schemes, the coupling-vortex schemes possess more uniform temperature fields, and the average Nu, f and Nu∙f−1/3 of the coupling-vortex schemes C12.3S50/C12.3S100 increase by 12.8%/9.9%, 15.2%/10.5% and 7.6%/6.3%, respectively; the smaller S or the closer A/B is to 1, the more advantageous the TETHX-CV.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Chessboard square tube layout, Coupling-vortex, Helical pitch, Parallel-vortex, Twisted elliptical tube heat exchangers
in
International Journal of Heat and Mass Transfer
volume
151
article number
119473
publisher
Pergamon
external identifiers
  • scopus:85079059132
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2020.119473
language
English
LU publication?
yes
id
d953f1e8-0ae3-4b66-b3d1-fa7c1515026c
date added to LUP
2020-02-14 09:41:15
date last changed
2020-02-26 07:41:47
@article{d953f1e8-0ae3-4b66-b3d1-fa7c1515026c,
  abstract     = {<p>The twisted elliptical tube heat exchangers with the novel coupling-vortex chessboard tube layout (TETHXs-CV) were simulated with the RNG k-ε model in software Fluent 15.0. The shell-side flow pattern at the tangential points between adjacent tubes in traditional TETHX is countercurrent while that in TETHX-CV is concurrent, which helps enhance heat transfer capability without any extra manufacturing cost. The impacts of the ratio A/B of the major axis to the minor axis and the twist pitch S were also investigated. The results indicate that with the increase of A/B and the decrease of S, the secondary flow behaves more intensely, the Nusselt number Nu and the friction factor f increase, while with the increase of A/B and S, the comprehensive evaluation index Nu∙f<sup>−1/3</sup> increases. The Nu, f and Nu∙f<sup>−1/3</sup> of all twisted tube schemes are higher than those of the smooth round tube schemes R10.8. Compared with corresponding parallel-vortex schemes, the coupling-vortex schemes possess more uniform temperature fields, and the average Nu, f and Nu∙f<sup>−1/3</sup> of the coupling-vortex schemes C12.3S50/C12.3S100 increase by 12.8%/9.9%, 15.2%/10.5% and 7.6%/6.3%, respectively; the smaller S or the closer A/B is to 1, the more advantageous the TETHX-CV.</p>},
  author       = {Gu, Huaduo and Chen, Yaping and Wu, Jiafeng and Sunden, Bengt},
  issn         = {0017-9310},
  language     = {eng},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Performance investigation on twisted elliptical tube heat exchangers with coupling-vortex square tube layout},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119473},
  doi          = {10.1016/j.ijheatmasstransfer.2020.119473},
  volume       = {151},
  year         = {2020},
}