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

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Bibtex

@article{d953f1e80ae34b66b3d1fa7c1515026c,
title = "Performance investigation on twisted elliptical tube heat exchangers with coupling-vortex square tube layout",
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 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.",
keywords = "Chessboard square tube layout, Coupling-vortex, Helical pitch, Parallel-vortex, Twisted elliptical tube heat exchangers",
author = "Huaduo Gu and Yaping Chen and Jiafeng Wu and Bengt Sunden",
year = "2020",
doi = "10.1016/j.ijheatmasstransfer.2020.119473",
language = "English",
volume = "151",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Pergamon",

}