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Numerical investigation of heat transfer and fluid flow in a rotating rectangular channel with variously-shaped discrete ribs

Wang, Jinsheng LU ; Liu, Jian LU ; Wang, Lei LU ; Sundén, Bengt LU and Wang, Songtao (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.

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author
organization
publishing date
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
language
English
LU publication?
yes
id
37368641-5697-4ce3-8253-4993c2de33f7
date added to LUP
2017-11-07 09:29:32
date last changed
2018-05-29 11:44:18
@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},
  keyword      = {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/},
  volume       = {129},
  year         = {2018},
}