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Parametric study on flow characteristics and heat transfer in rectangular channels with strip slits in ribs on one wall

Li, Xin ; Xie, Gongnan LU ; Liu, Jian LU and Sunden, Bengt LU (2020) In International Journal of Heat and Mass Transfer 149.
Abstract

Augmentation of heat transfer must always be judged against an additional pressure loss. To this context, this paper explores slitted ribs on the turbulent flow and heat transfer characteristics in rectangular cooling channels with an aspect ratio of 4:1. A verified v2f turbulence model is applied in the present numerical simulations in the Reynolds number range from 20,000 to 80,000. The flow and thermal performance of various geometrical structures for the ratios of slit-length-to-rib-length (Rl = 0, 0.20, 0.35 and 0.50) and the rib heights (e = 10 mm, 15 mm and 20 mm) are comprehensively compared and evaluated. Special thermal behaviors are carefully observed and analyzed with slits on ribs of different height.... (More)

Augmentation of heat transfer must always be judged against an additional pressure loss. To this context, this paper explores slitted ribs on the turbulent flow and heat transfer characteristics in rectangular cooling channels with an aspect ratio of 4:1. A verified v2f turbulence model is applied in the present numerical simulations in the Reynolds number range from 20,000 to 80,000. The flow and thermal performance of various geometrical structures for the ratios of slit-length-to-rib-length (Rl = 0, 0.20, 0.35 and 0.50) and the rib heights (e = 10 mm, 15 mm and 20 mm) are comprehensively compared and evaluated. Special thermal behaviors are carefully observed and analyzed with slits on ribs of different height. It is found that strip slits in low-height ribs provide both lower Nusselt number and friction factors than the corresponding solid ribs, while an opposite effect is captured for strip slits on high-height ribs. The present results suggest that introducing a short-length strip slit in ribs could be a beneficial way to enhance heat transfer of cooling channels with high-height ribs.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cooling channel, Flow characteristics, Heat transfer, Slit ribs, Thermal performance
in
International Journal of Heat and Mass Transfer
volume
149
article number
118396
publisher
Pergamon
external identifiers
  • scopus:85077752934
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2019.07.046
language
English
LU publication?
yes
id
f70d91ff-41f7-4dfb-accf-8755c46cfb66
date added to LUP
2020-01-23 11:14:16
date last changed
2020-01-30 03:59:01
@article{f70d91ff-41f7-4dfb-accf-8755c46cfb66,
  abstract     = {<p>Augmentation of heat transfer must always be judged against an additional pressure loss. To this context, this paper explores slitted ribs on the turbulent flow and heat transfer characteristics in rectangular cooling channels with an aspect ratio of 4:1. A verified v<sup>2</sup>f turbulence model is applied in the present numerical simulations in the Reynolds number range from 20,000 to 80,000. The flow and thermal performance of various geometrical structures for the ratios of slit-length-to-rib-length (R<sub>l</sub> = 0, 0.20, 0.35 and 0.50) and the rib heights (e = 10 mm, 15 mm and 20 mm) are comprehensively compared and evaluated. Special thermal behaviors are carefully observed and analyzed with slits on ribs of different height. It is found that strip slits in low-height ribs provide both lower Nusselt number and friction factors than the corresponding solid ribs, while an opposite effect is captured for strip slits on high-height ribs. The present results suggest that introducing a short-length strip slit in ribs could be a beneficial way to enhance heat transfer of cooling channels with high-height ribs.</p>},
  author       = {Li, Xin and Xie, Gongnan and Liu, Jian and Sunden, Bengt},
  issn         = {0017-9310},
  language     = {eng},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Parametric study on flow characteristics and heat transfer in rectangular channels with strip slits in ribs on one wall},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.07.046},
  doi          = {10.1016/j.ijheatmasstransfer.2019.07.046},
  volume       = {149},
  year         = {2020},
}