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Convergence angle and dimple shape effects on the heat transfer characteristics in a rotating dimple-pin fin wedge duct

Luo, Lei ; Yan, Han ; Yang, Shaoyun ; Du, Wei LU ; Wang, Songtao ; Sunden, Bengt LU and Zhang, Xinghong (2019) In Numerical Heat Transfer; Part A: Applications 74(10). p.1611-1635
Abstract

A numerical method is employed to study effects of convergence angle and dimple shape on flow structure and heat transfer under a rotating frame. The investigated convergence angles are 0.0°, 6.3°, and 12.7°. The dimple shapes are circular, streamwise-elliptical, and spanwise-elliptical. The rotation number ranges from 0.0 to 0.4. Computed flow structures and heat transfer are compared. Higher rotation number generates better heat transfer in the dimple-pin wedge duct. The rotation direction also affects the flow structure and heat transfer. The spanwise-elliptical dimple shape shows best heat transfer augmentation as it generates the strongest vortex structure and turbulent kinetic energy in the dimples. Larger convergence angles... (More)

A numerical method is employed to study effects of convergence angle and dimple shape on flow structure and heat transfer under a rotating frame. The investigated convergence angles are 0.0°, 6.3°, and 12.7°. The dimple shapes are circular, streamwise-elliptical, and spanwise-elliptical. The rotation number ranges from 0.0 to 0.4. Computed flow structures and heat transfer are compared. Higher rotation number generates better heat transfer in the dimple-pin wedge duct. The rotation direction also affects the flow structure and heat transfer. The spanwise-elliptical dimple shape shows best heat transfer augmentation as it generates the strongest vortex structure and turbulent kinetic energy in the dimples. Larger convergence angles exhibit larger Nusselt numbers and better heat transfer enhancement. Effects of the Coriolis force are considered as this force has favorable effects on enhancing the heat transfer on the surface it acts on.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
74
issue
10
pages
25 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85061094623
ISSN
1040-7782
DOI
10.1080/10407782.2018.1543920
language
English
LU publication?
yes
id
c0b843f0-c64a-4ef4-9408-af74b0b3ca50
date added to LUP
2019-02-15 08:57:45
date last changed
2020-02-12 09:54:07
@article{c0b843f0-c64a-4ef4-9408-af74b0b3ca50,
  abstract     = {<p>A numerical method is employed to study effects of convergence angle and dimple shape on flow structure and heat transfer under a rotating frame. The investigated convergence angles are 0.0°, 6.3°, and 12.7°. The dimple shapes are circular, streamwise-elliptical, and spanwise-elliptical. The rotation number ranges from 0.0 to 0.4. Computed flow structures and heat transfer are compared. Higher rotation number generates better heat transfer in the dimple-pin wedge duct. The rotation direction also affects the flow structure and heat transfer. The spanwise-elliptical dimple shape shows best heat transfer augmentation as it generates the strongest vortex structure and turbulent kinetic energy in the dimples. Larger convergence angles exhibit larger Nusselt numbers and better heat transfer enhancement. Effects of the Coriolis force are considered as this force has favorable effects on enhancing the heat transfer on the surface it acts on.</p>},
  author       = {Luo, Lei and Yan, Han and Yang, Shaoyun and Du, Wei and Wang, Songtao and Sunden, Bengt and Zhang, Xinghong},
  issn         = {1040-7782},
  language     = {eng},
  month        = {02},
  number       = {10},
  pages        = {1611--1635},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer; Part A: Applications},
  title        = {Convergence angle and dimple shape effects on the heat transfer characteristics in a rotating dimple-pin fin wedge duct},
  url          = {http://dx.doi.org/10.1080/10407782.2018.1543920},
  doi          = {10.1080/10407782.2018.1543920},
  volume       = {74},
  year         = {2019},
}