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Heat transfer and friction factor performance in a pin fin wedge duct with different dimple arrangements

Lei, Luo LU ; Wang, Chenglong LU ; Wang, Lei LU ; Sundén, Bengt LU and Wang, Songtao (2016) In Numerical Heat Transfer Part A: Applications 69(2). p.209-226
Abstract
In this study, numerical simulations are conducted to investigate the effects of dimple positions on the endwall heat transfer and friction factor in a pin fin wedge duct. The dimple diameter is the same as the pin fin diameter, while the ratio between dimple depth and dimple diameter is 0.2. Three different dimple positions are investigated (i.e., directly upstream of the pin fins, in a staggered manner relative to the pin fins, or in line with the pin fins. The Reynolds number ranges from 10,000 to 50,000. Results for endwall Nusselt number, friction factor, and flow structure are included. For convenience of comparison, the pin fin wedge duct without dimples is studied as baseline. It is found that dimples can effectively enhance... (More)
In this study, numerical simulations are conducted to investigate the effects of dimple positions on the endwall heat transfer and friction factor in a pin fin wedge duct. The dimple diameter is the same as the pin fin diameter, while the ratio between dimple depth and dimple diameter is 0.2. Three different dimple positions are investigated (i.e., directly upstream of the pin fins, in a staggered manner relative to the pin fins, or in line with the pin fins. The Reynolds number ranges from 10,000 to 50,000. Results for endwall Nusselt number, friction factor, and flow structure are included. For convenience of comparison, the pin fin wedge duct without dimples is studied as baseline. It is found that dimples can effectively enhance endwall heat transfer. Among the tested parameters, the dimple position in line with the pin fins provides the best heat transfer enhancement, with low friction factor penalty. However, the various dimple positions have distinct effects on the friction factor depending on the flow structure near the dimple zone. For the first position, the friction factor is markedly increased due to flow impingement, recirculation, and mixing, while for the second and third positions, the friction factor is changed slightly due to different flow behaviors. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer Part A: Applications
volume
69
issue
2
pages
209 - 226
publisher
Taylor & Francis
external identifiers
  • wos:000367555700007
  • scopus:84953350419
ISSN
1040-7782
DOI
10.1080/10407782.2015.1052301
language
English
LU publication?
yes
id
5a226d33-429b-4362-ae96-74bf4c1478d6 (old id 8761652)
date added to LUP
2016-02-22 13:05:39
date last changed
2017-11-19 03:45:55
@article{5a226d33-429b-4362-ae96-74bf4c1478d6,
  abstract     = {In this study, numerical simulations are conducted to investigate the effects of dimple positions on the endwall heat transfer and friction factor in a pin fin wedge duct. The dimple diameter is the same as the pin fin diameter, while the ratio between dimple depth and dimple diameter is 0.2. Three different dimple positions are investigated (i.e., directly upstream of the pin fins, in a staggered manner relative to the pin fins, or in line with the pin fins. The Reynolds number ranges from 10,000 to 50,000. Results for endwall Nusselt number, friction factor, and flow structure are included. For convenience of comparison, the pin fin wedge duct without dimples is studied as baseline. It is found that dimples can effectively enhance endwall heat transfer. Among the tested parameters, the dimple position in line with the pin fins provides the best heat transfer enhancement, with low friction factor penalty. However, the various dimple positions have distinct effects on the friction factor depending on the flow structure near the dimple zone. For the first position, the friction factor is markedly increased due to flow impingement, recirculation, and mixing, while for the second and third positions, the friction factor is changed slightly due to different flow behaviors.},
  author       = {Lei, Luo and Wang, Chenglong and Wang, Lei and Sundén, Bengt and Wang, Songtao},
  issn         = {1040-7782},
  language     = {eng},
  number       = {2},
  pages        = {209--226},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer Part A: Applications},
  title        = {Heat transfer and friction factor performance in a pin fin wedge duct with different dimple arrangements},
  url          = {http://dx.doi.org/10.1080/10407782.2015.1052301},
  volume       = {69},
  year         = {2016},
}