Impingement Cooling in a Rib-Roughened Channel With Cross-Flow

Publication: Research - peer-reviewJournal article – Annual report year: 2001

Without internal affiliation

  • Author: Jia, Rongguang

  • Author: Rokni, Masoud

    Unknown

  • Author: Sundén, Bengt

View graph of relations

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.
Keyword: Heat transfer, Surface roughness, Turbulence
Original languageEnglish
JournalInternational Journal of Numerical Methods for Heat & Fluid Flow
Publication date2001
Volume11
Issue7
Pages642-662
ISSN0961-5539
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 14
Download as:
Download as PDF
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
Word

ID: 2870218