Performance investigation on twisted elliptical tube heat exchangers with coupling-vortex square tube layout
(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.
(Less)
- author
- Gu, Huaduo LU ; Chen, Yaping ; Wu, Jiafeng and Sunden, Bengt LU
- organization
- publishing date
- 2020
- 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 Press Ltd.
- 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
- 2023-11-19 23:49:39
@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}}, keywords = {{Chessboard square tube layout; Coupling-vortex; Helical pitch; Parallel-vortex; Twisted elliptical tube heat exchangers}}, language = {{eng}}, publisher = {{Pergamon Press Ltd.}}, 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}}, }