Numerical investigation of heat transfer and fluid flow in a rotating rectangular channel with variously-shaped discrete ribs
(2018) In Applied Thermal Engineering 129. p.1369-1381- Abstract
A numerical study is performed to investigate the effects of various discrete rib configurations on the heat transfer and fluid flow characteristics of a rotating rectangular straight channel (aspect ratio of 2:1) with 45° orientation. Three parameters of the discrete rib configuration - rib streamwise distance, rib widthwise distance, and inner-half-rib angle - are examined based on a continuous inclined rib. The blockage ratio (e/Dh) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 in each case, while the rotation number is varied from 0 to 0.7. Details of the turbulent flow structure, turbulence kinetic energies, temperature fields, normalized Nusselt numbers, friction penalties and thermal... (More)
A numerical study is performed to investigate the effects of various discrete rib configurations on the heat transfer and fluid flow characteristics of a rotating rectangular straight channel (aspect ratio of 2:1) with 45° orientation. Three parameters of the discrete rib configuration - rib streamwise distance, rib widthwise distance, and inner-half-rib angle - are examined based on a continuous inclined rib. The blockage ratio (e/Dh) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 in each case, while the rotation number is varied from 0 to 0.7. Details of the turbulent flow structure, turbulence kinetic energies, temperature fields, normalized Nusselt numbers, friction penalties and thermal performance factors were obtained by Computation of Fluid Dynamics (CFD) with the k-ω SST turbulence model. The results show that a small streamwise rib gap can effectively enhance the leading wall heat transfer. The heat transfer decreases gradually as the streamwise rib gap is enlarged. The inner-half-rib angle β provides the most conspicuous effects on heat transfer and friction loss, and the best heat transfer appears at β = 60° or 75° for different rotating conditions. The case with a rib streamwise gap normalized distance of 0.2 and inner-half-rib angle of 45° provides best thermal performance. A widthwise rib gap is favorable in reducing pressure drop, but its heat transfer augmentation is limited.
(Less)
- author
- Wang, Jinsheng LU ; Liu, Jian LU ; Wang, Lei LU ; Sundén, Bengt LU and Wang, Songtao
- organization
- publishing date
- 2018-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Channel orientation, Coriolis force, Discrete rib, Heat transfer, Numerical simulation
- in
- Applied Thermal Engineering
- volume
- 129
- pages
- 1369 - 1381
- publisher
- Elsevier
- external identifiers
-
- scopus:85032334190
- ISSN
- 1359-4311
- DOI
- 10.1016/j.applthermaleng.2017.09.142
- language
- English
- LU publication?
- yes
- id
- 37368641-5697-4ce3-8253-4993c2de33f7
- date added to LUP
- 2017-11-07 09:29:32
- date last changed
- 2022-03-17 02:09:31
@article{37368641-5697-4ce3-8253-4993c2de33f7,
abstract = {{<p>A numerical study is performed to investigate the effects of various discrete rib configurations on the heat transfer and fluid flow characteristics of a rotating rectangular straight channel (aspect ratio of 2:1) with 45° orientation. Three parameters of the discrete rib configuration - rib streamwise distance, rib widthwise distance, and inner-half-rib angle - are examined based on a continuous inclined rib. The blockage ratio (e/D<sub>h</sub>) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 in each case, while the rotation number is varied from 0 to 0.7. Details of the turbulent flow structure, turbulence kinetic energies, temperature fields, normalized Nusselt numbers, friction penalties and thermal performance factors were obtained by Computation of Fluid Dynamics (CFD) with the k-ω SST turbulence model. The results show that a small streamwise rib gap can effectively enhance the leading wall heat transfer. The heat transfer decreases gradually as the streamwise rib gap is enlarged. The inner-half-rib angle β provides the most conspicuous effects on heat transfer and friction loss, and the best heat transfer appears at β = 60° or 75° for different rotating conditions. The case with a rib streamwise gap normalized distance of 0.2 and inner-half-rib angle of 45° provides best thermal performance. A widthwise rib gap is favorable in reducing pressure drop, but its heat transfer augmentation is limited.</p>}},
author = {{Wang, Jinsheng and Liu, Jian and Wang, Lei and Sundén, Bengt and Wang, Songtao}},
issn = {{1359-4311}},
keywords = {{Channel orientation; Coriolis force; Discrete rib; Heat transfer; Numerical simulation}},
language = {{eng}},
pages = {{1369--1381}},
publisher = {{Elsevier}},
series = {{Applied Thermal Engineering}},
title = {{Numerical investigation of heat transfer and fluid flow in a rotating rectangular channel with variously-shaped discrete ribs}},
url = {{http://dx.doi.org/10.1016/j.applthermaleng.2017.09.142}},
doi = {{10.1016/j.applthermaleng.2017.09.142}},
volume = {{129}},
year = {{2018}},
}