Heat transfer enhancement and flow characteristics of internal cooling channels with slit vortex generators
(2023) In Numerical Heat Transfer; Part A: Applications- Abstract
Vortex generators can boost heat transfer performance greatly, although they are always linked with significant pressure drops. In this article, to reduce the pressure drop while improving the thermal efficiency simultaneously, traditional delta winglet pair vortex generators (DWPVG) with slits are installed in the rectangular channel. Besides, the effects of slits on DWPVG on pressure drops and heat transfer performances for different Reynolds numbers are studied. To reveal the fluid flow characteristics, three-dimensional calculations using a confirmed turbulence model are undertaken and the underlying thermo-fluid processes are exposed for the various investigated cases. To reveal the overall thermal performance of different cases,... (More)
Vortex generators can boost heat transfer performance greatly, although they are always linked with significant pressure drops. In this article, to reduce the pressure drop while improving the thermal efficiency simultaneously, traditional delta winglet pair vortex generators (DWPVG) with slits are installed in the rectangular channel. Besides, the effects of slits on DWPVG on pressure drops and heat transfer performances for different Reynolds numbers are studied. To reveal the fluid flow characteristics, three-dimensional calculations using a confirmed turbulence model are undertaken and the underlying thermo-fluid processes are exposed for the various investigated cases. To reveal the overall thermal performance of different cases, two overall thermal performance factors Nu ave/Nu 0/(f/f 0) and Nu ave/Nu 0/(f/f 0)1/3 are used. The findings suggest that when the fluid flows through slits, induced vortices are located closer to the bottom surface, generating an improvement of the local Nusselt number behind DWPVG. Furthermore, DWPVG with slits can decrease the pressure drop, but also make the local thermal efficiency improve in the channel with a high blocking ratio. Moreover, the increase in the overall thermal performance of the slit DWPVG channel with a high blocking ratio is enlarged with the Reynolds number raise. Besides, the highest heat transfer enhancement is provided by opening slits on five DWPVGs in the rectangular channel.
(Less)
- author
- Tang, Siwei ; Xie, Gongnan LU ; Zhang, Guohua LU and Sundén, Bengt LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- epub
- subject
- keywords
- Heat transfer, overall thermal performance, pressure drop, slit, vortex generator
- in
- Numerical Heat Transfer; Part A: Applications
- publisher
- Taylor & Francis
- external identifiers
-
- scopus:85165419468
- ISSN
- 1040-7782
- DOI
- 10.1080/10407782.2023.2233732
- language
- English
- LU publication?
- yes
- id
- 001f4535-a907-4042-b7e4-675f6489abff
- date added to LUP
- 2023-09-20 11:35:52
- date last changed
- 2023-11-21 22:27:16
@article{001f4535-a907-4042-b7e4-675f6489abff,
abstract = {{<p>Vortex generators can boost heat transfer performance greatly, although they are always linked with significant pressure drops. In this article, to reduce the pressure drop while improving the thermal efficiency simultaneously, traditional delta winglet pair vortex generators (DWPVG) with slits are installed in the rectangular channel. Besides, the effects of slits on DWPVG on pressure drops and heat transfer performances for different Reynolds numbers are studied. To reveal the fluid flow characteristics, three-dimensional calculations using a confirmed turbulence model are undertaken and the underlying thermo-fluid processes are exposed for the various investigated cases. To reveal the overall thermal performance of different cases, two overall thermal performance factors Nu <sub>ave</sub>/Nu <sub>0</sub>/(f/f <sub>0</sub>) and Nu <sub>ave</sub>/Nu <sub>0</sub>/(f/f <sub>0</sub>)<sup>1/3</sup> are used. The findings suggest that when the fluid flows through slits, induced vortices are located closer to the bottom surface, generating an improvement of the local Nusselt number behind DWPVG. Furthermore, DWPVG with slits can decrease the pressure drop, but also make the local thermal efficiency improve in the channel with a high blocking ratio. Moreover, the increase in the overall thermal performance of the slit DWPVG channel with a high blocking ratio is enlarged with the Reynolds number raise. Besides, the highest heat transfer enhancement is provided by opening slits on five DWPVGs in the rectangular channel.</p>}},
author = {{Tang, Siwei and Xie, Gongnan and Zhang, Guohua and Sundén, Bengt}},
issn = {{1040-7782}},
keywords = {{Heat transfer; overall thermal performance; pressure drop; slit; vortex generator}},
language = {{eng}},
publisher = {{Taylor & Francis}},
series = {{Numerical Heat Transfer; Part A: Applications}},
title = {{Heat transfer enhancement and flow characteristics of internal cooling channels with slit vortex generators}},
url = {{http://dx.doi.org/10.1080/10407782.2023.2233732}},
doi = {{10.1080/10407782.2023.2233732}},
year = {{2023}},
}