Advanced

Impingement cooling in a rib-roughened channel with cross-flow

Jia, Rongguang LU ; Rokni, Masoud LU and Sundén, Bengt LU (2001) In International Journal of Numerical Methods for Heat & Fluid Flow 11(7). p.642-662
Abstract
A numerical investigation to determine the velocity and heat transfer characteristics of multiple impinging slot jets in rib-roughened channels in the presence of cross-flow has been carried out. Fluid flow is modeled using an explicit algebraic stress model. A simple eddy diffusivity and a generalized gradient diffusion hypothesis are applied for the modeling of turbulent heat fluxes. The computations are validated against available experimental fluid flow and heat transfer data. Different size and arrangement of jets and ribs are considered in detail, while the Reynolds numbers of a jet and the channel inlet are fixed at 6,000 and 14,000, respectively. Results show that the ratio (B/W) between the size of the jets and ribs is most... (More)
A numerical investigation to determine the velocity and heat transfer characteristics of multiple impinging slot jets in rib-roughened channels in the presence of cross-flow has been carried out. Fluid flow is modeled using an explicit algebraic stress model. A simple eddy diffusivity and a generalized gradient diffusion hypothesis are applied for the modeling of turbulent heat fluxes. The computations are validated against available experimental fluid flow and heat transfer data. Different size and arrangement of jets and ribs are considered in detail, while the Reynolds numbers of a jet and the channel inlet are fixed at 6,000 and 14,000, respectively. Results show that the ratio (B/W) between the size of the jets and ribs is most important. An explanation is that the ribs inhibit the motion of eddies by preventing them from coming very close to the surface when B/W is low, e.g. B/W = 1, although the ribs will increase the turbulence intensity. This blockage limited the heat transfer enhancement effect of the ribs and impinging jets. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
International Journal of Numerical Methods for Heat & Fluid Flow
volume
11
issue
7
pages
642 - 662
publisher
Emerald Group Publishing Limited
external identifiers
  • wos:000171708100002
  • scopus:0034793938
ISSN
1758-6585
DOI
10.1108/09615530110403598
language
English
LU publication?
yes
id
7e7089f7-f198-41f1-8ba5-e50d67615007 (old id 131448)
date added to LUP
2007-07-04 09:13:53
date last changed
2018-05-29 10:12:49
@article{7e7089f7-f198-41f1-8ba5-e50d67615007,
  abstract     = {A numerical investigation to determine the velocity and heat transfer characteristics of multiple impinging slot jets in rib-roughened channels in the presence of cross-flow has been carried out. Fluid flow is modeled using an explicit algebraic stress model. A simple eddy diffusivity and a generalized gradient diffusion hypothesis are applied for the modeling of turbulent heat fluxes. The computations are validated against available experimental fluid flow and heat transfer data. Different size and arrangement of jets and ribs are considered in detail, while the Reynolds numbers of a jet and the channel inlet are fixed at 6,000 and 14,000, respectively. Results show that the ratio (B/W) between the size of the jets and ribs is most important. An explanation is that the ribs inhibit the motion of eddies by preventing them from coming very close to the surface when B/W is low, e.g. B/W = 1, although the ribs will increase the turbulence intensity. This blockage limited the heat transfer enhancement effect of the ribs and impinging jets.},
  author       = {Jia, Rongguang and Rokni, Masoud and Sundén, Bengt},
  issn         = {1758-6585},
  language     = {eng},
  number       = {7},
  pages        = {642--662},
  publisher    = {Emerald Group Publishing Limited},
  series       = {International Journal of Numerical Methods for Heat & Fluid Flow},
  title        = {Impingement cooling in a rib-roughened channel with cross-flow},
  url          = {http://dx.doi.org/10.1108/09615530110403598},
  volume       = {11},
  year         = {2001},
}