Performance investigation on the novel anti-leakage and easy-to-manufacture trisection helical baffle electric heaters
(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.
(Less)
- author
- Gu, Huaduo LU ; Chen, Yaping ; Wu, Jiafeng ; Fei, Fengfan and Sundén, Bengt LU
- organization
- publishing date
- 2021
- 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
- 2023-11-06 11:28:01
@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}},
keywords = {{Anti-leakage; Electric heaters; Heat transfer enhancement; Helical baffles; Manufacture}},
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}},
}