Parametric study on flow characteristics and heat transfer in rectangular channels with strip slits in ribs on one wall
(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.
(Less)
- author
- Li, Xin ; Xie, Gongnan LU ; Liu, Jian LU and Sunden, Bengt LU
- organization
- publishing date
- 2020
- 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 Press Ltd.
- 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
- 2023-11-19 22:12:39
@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}},
keywords = {{Cooling channel; Flow characteristics; Heat transfer; Slit ribs; Thermal performance}},
language = {{eng}},
publisher = {{Pergamon Press Ltd.}},
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}},
}