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Thermal performance in a pin fin-dimple/protrusion duct with different optimal objectives

Du, Wei LU ; Wang, Chenglong LU ; Luo, Lei ; Wang, Songtao and Sunden, Bengt LU (2021) In Heat Transfer Research 52(8). p.47-70
Abstract

In the present study, the optimal objective effect on the thermal performance of a rectangular duct with pin fins and dimples/protrusions is introduced. Four different optimal objectives are selected (entropy generation, entransy dissipation, enerty, and volume goodness factor). The baseline k-ù turbulence model is applied to solve the governing equations. The multi-island genetic algorithm (MIGA) is used to find the optimal solution. The results indicate that the thermal performance is sensitive to the optimal objective. By using the dimple/protrusion configuration, the Nusselt number is increased remarkably in the pin-finned duct. Using the volume goodness factor as an optimal objective, the Nusselt number and friction factor reach... (More)

In the present study, the optimal objective effect on the thermal performance of a rectangular duct with pin fins and dimples/protrusions is introduced. Four different optimal objectives are selected (entropy generation, entransy dissipation, enerty, and volume goodness factor). The baseline k-ù turbulence model is applied to solve the governing equations. The multi-island genetic algorithm (MIGA) is used to find the optimal solution. The results indicate that the thermal performance is sensitive to the optimal objective. By using the dimple/protrusion configuration, the Nusselt number is increased remarkably in the pin-finned duct. Using the volume goodness factor as an optimal objective, the Nusselt number and friction factor reach their highest values due to the greatest strength of the horseshoe vortex. An optimal objective of enerty produces a minimal increase in the Nusselt number. A relatively low friction factor is found in the cases that use entransy dissipation and enerty as optimal objectives.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dimples, Duct flow, Optimal objectives, Pin fins, Protrusions, Thermal performance
in
Heat Transfer Research
volume
52
issue
8
pages
24 pages
publisher
Begell House
external identifiers
  • scopus:85107278601
ISSN
1064-2285
DOI
10.1615/HEATTRANSRES.2021037522
language
English
LU publication?
yes
id
4694fb60-fd8f-45fb-abe7-d136659ab7b7
date added to LUP
2021-07-12 13:03:41
date last changed
2023-11-08 16:32:09
@article{4694fb60-fd8f-45fb-abe7-d136659ab7b7,
  abstract     = {{<p>In the present study, the optimal objective effect on the thermal performance of a rectangular duct with pin fins and dimples/protrusions is introduced. Four different optimal objectives are selected (entropy generation, entransy dissipation, enerty, and volume goodness factor). The baseline k-ù turbulence model is applied to solve the governing equations. The multi-island genetic algorithm (MIGA) is used to find the optimal solution. The results indicate that the thermal performance is sensitive to the optimal objective. By using the dimple/protrusion configuration, the Nusselt number is increased remarkably in the pin-finned duct. Using the volume goodness factor as an optimal objective, the Nusselt number and friction factor reach their highest values due to the greatest strength of the horseshoe vortex. An optimal objective of enerty produces a minimal increase in the Nusselt number. A relatively low friction factor is found in the cases that use entransy dissipation and enerty as optimal objectives. </p>}},
  author       = {{Du, Wei and Wang, Chenglong and Luo, Lei and Wang, Songtao and Sunden, Bengt}},
  issn         = {{1064-2285}},
  keywords     = {{Dimples; Duct flow; Optimal objectives; Pin fins; Protrusions; Thermal performance}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{47--70}},
  publisher    = {{Begell House}},
  series       = {{Heat Transfer Research}},
  title        = {{Thermal performance in a pin fin-dimple/protrusion duct with different optimal objectives}},
  url          = {{http://dx.doi.org/10.1615/HEATTRANSRES.2021037522}},
  doi          = {{10.1615/HEATTRANSRES.2021037522}},
  volume       = {{52}},
  year         = {{2021}},
}