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Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation

Liu, Jian LU ; Xie, Gongnan LU ; Sundén, Bengt LU ; Wang, Lei LU and Andersson, Martin LU (2017) In International Journal of Numerical Methods for Heat and Fluid Flow 27(7). p.1571-1595
Abstract

Purpose - The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties. Design/methodology/approach - The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work. Findings - Based on the results, it is found that rounded transition cylindrical ribs have a large... (More)

Purpose - The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties. Design/methodology/approach - The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work. Findings - Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling. Originality/value - The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves tomanipulate the turbulent flow.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Conventional ribs, Cylindrical ribs, Grooves, Heat transfer enhancement, Recirculating flow, Rounded transitions
in
International Journal of Numerical Methods for Heat and Fluid Flow
volume
27
issue
7
pages
25 pages
publisher
Emerald Group Publishing Limited
external identifiers
  • scopus:85026911194
  • wos:000407282600012
ISSN
0961-5539
DOI
10.1108/HFF-03-2016-0120
language
English
LU publication?
yes
id
a1e7fc18-8ed7-4f6e-92e5-00b9e04c1d43
date added to LUP
2017-09-01 15:05:05
date last changed
2017-09-18 11:44:04
@article{a1e7fc18-8ed7-4f6e-92e5-00b9e04c1d43,
  abstract     = {<p>Purpose - The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties. Design/methodology/approach - The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work. Findings - Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling. Originality/value - The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves tomanipulate the turbulent flow.</p>},
  author       = {Liu, Jian and Xie, Gongnan and Sundén, Bengt and Wang, Lei and Andersson, Martin},
  issn         = {0961-5539},
  keyword      = {Conventional ribs,Cylindrical ribs,Grooves,Heat transfer enhancement,Recirculating flow,Rounded transitions},
  language     = {eng},
  number       = {7},
  pages        = {1571--1595},
  publisher    = {Emerald Group Publishing Limited},
  series       = {International Journal of Numerical Methods for Heat and Fluid Flow},
  title        = {Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation},
  url          = {http://dx.doi.org/10.1108/HFF-03-2016-0120},
  volume       = {27},
  year         = {2017},
}