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Performance investigation on the novel anti-leakage and easy-to-manufacture trisection helical baffle electric heaters

Gu, Huaduo LU ; Chen, Yaping ; Wu, Jiafeng ; Fei, Fengfan and Sundén, Bengt LU (2021) In International Journal of Heat and Mass Transfer 172.
Abstract

The difficult manufacturing of helical baffles hinders the widespread application of the enhancement technology and the shortcut leakage between adjacent baffles impairs the enhancement effects. To solve these two issues, the promising anti-leakage and easy-to-manufacture helical baffles with small inclined angle and folded structure are proposed, which can be produced by 2D laser cutting and simple mechanical folding. The influence of different helical baffle configurations, including three normal helical schemes, three axial separation helical schemes, three novel folded axial separation helical baffle schemes and a segmental scheme on the performance of electric heaters are numerically investigated. The equivalent angles of helical... (More)

The difficult manufacturing of helical baffles hinders the widespread application of the enhancement technology and the shortcut leakage between adjacent baffles impairs the enhancement effects. To solve these two issues, the promising anti-leakage and easy-to-manufacture helical baffles with small inclined angle and folded structure are proposed, which can be produced by 2D laser cutting and simple mechanical folding. The influence of different helical baffle configurations, including three normal helical schemes, three axial separation helical schemes, three novel folded axial separation helical baffle schemes and a segmental scheme on the performance of electric heaters are numerically investigated. The equivalent angles of helical schemes adopted in this work are 15°, 20° and 25°, and the inclined angle of helical baffles under axial separation connection style is 10°. Compared with the corresponding axial separation scheme without folding, the leakage can be significantly decreased, the heat transfer coefficients h and the comprehensive indices h⋅Δp−1/3 of FH15(10)°, FH20(10)° and FH25(10)° are increased by 6.5%/2.3%, 12.2%/7.3% and 20.4%/13.0%, and the averaged tube wall temperatures Tw are decreased by 12.5 K, 25.4 K and 54.7 K, respectively. This research can provide feasibility for the extended application of helical baffles in electric heaters or heat exchangers.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anti-leakage, Electric heaters, Heat transfer enhancement, Helical baffles, Manufacture
in
International Journal of Heat and Mass Transfer
volume
172
article number
121142
publisher
Pergamon Press Ltd.
external identifiers
  • scopus:85102122639
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2021.121142
language
English
LU publication?
yes
id
c6b6e8ad-18cc-48bd-b5af-ba148436298b
date added to LUP
2021-03-16 12:11:25
date last changed
2021-03-16 12:11:25
@article{c6b6e8ad-18cc-48bd-b5af-ba148436298b,
  abstract     = {<p>The difficult manufacturing of helical baffles hinders the widespread application of the enhancement technology and the shortcut leakage between adjacent baffles impairs the enhancement effects. To solve these two issues, the promising anti-leakage and easy-to-manufacture helical baffles with small inclined angle and folded structure are proposed, which can be produced by 2D laser cutting and simple mechanical folding. The influence of different helical baffle configurations, including three normal helical schemes, three axial separation helical schemes, three novel folded axial separation helical baffle schemes and a segmental scheme on the performance of electric heaters are numerically investigated. The equivalent angles of helical schemes adopted in this work are 15°, 20° and 25°, and the inclined angle of helical baffles under axial separation connection style is 10°. Compared with the corresponding axial separation scheme without folding, the leakage can be significantly decreased, the heat transfer coefficients h and the comprehensive indices h⋅Δp<sup>−1/3</sup> of FH15(10)°, FH20(10)° and FH25(10)° are increased by 6.5%/2.3%, 12.2%/7.3% and 20.4%/13.0%, and the averaged tube wall temperatures T<sub>w</sub> are decreased by 12.5 K, 25.4 K and 54.7 K, respectively. This research can provide feasibility for the extended application of helical baffles in electric heaters or heat exchangers.</p>},
  author       = {Gu, Huaduo and Chen, Yaping and Wu, Jiafeng and Fei, Fengfan and Sundén, Bengt},
  issn         = {0017-9310},
  language     = {eng},
  publisher    = {Pergamon Press Ltd.},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Performance investigation on the novel anti-leakage and easy-to-manufacture trisection helical baffle electric heaters},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121142},
  doi          = {10.1016/j.ijheatmasstransfer.2021.121142},
  volume       = {172},
  year         = {2021},
}