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Effect of droplet characteristics on heat transfer of mist/air cooling in a pin-finned channel

Ye, Lv LU ; Yang, Xing; Sunden, Bengt LU and Feng, Zhenping (2019) In Numerical Heat Transfer; Part A: Applications 75(5). p.291-308
Abstract

Effects of droplet characteristics of mist/air cooling on heat transfer for three pin-fin structures are investigated. The round-tip pin-fin structure is newly proposed with partial detachment from one endwall with a round-shaped tip structure. A flat-tip pin-fin with partial detachment and a traditional pin-fin with full attachment serve as references. Reynolds-averaged Navier-Stokes equations and the shear-stress-transport turbulence model are applied. Influences of initial mist temperature, initial mist diameter and initial mist velocity are analyzed in the Reynolds number range 15,000 to 50,000. The round-tip pin-finned channel has highest heat transfer coefficient and lowest pressure loss among the structures. Heat transfer... (More)

Effects of droplet characteristics of mist/air cooling on heat transfer for three pin-fin structures are investigated. The round-tip pin-fin structure is newly proposed with partial detachment from one endwall with a round-shaped tip structure. A flat-tip pin-fin with partial detachment and a traditional pin-fin with full attachment serve as references. Reynolds-averaged Navier-Stokes equations and the shear-stress-transport turbulence model are applied. Influences of initial mist temperature, initial mist diameter and initial mist velocity are analyzed in the Reynolds number range 15,000 to 50,000. The round-tip pin-finned channel has highest heat transfer coefficient and lowest pressure loss among the structures. Heat transfer enhancement increases first gradually and then decreases sharply with increasing initial mist diameter but an optimal diameter exists for the highest Nusselt numbers. Nusselt number decreases monotonically with increasing initial mist temperature. Droplet movement and heat transfer are nearly independent of initial mist velocity.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
75
issue
5
pages
18 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85064146894
ISSN
1040-7782
DOI
10.1080/10407782.2019.1586426
language
English
LU publication?
yes
id
2f54f257-3b9c-4b67-91f3-61428ed411ce
date added to LUP
2019-05-08 14:11:47
date last changed
2019-09-17 04:52:56
@article{2f54f257-3b9c-4b67-91f3-61428ed411ce,
  abstract     = {<p>Effects of droplet characteristics of mist/air cooling on heat transfer for three pin-fin structures are investigated. The round-tip pin-fin structure is newly proposed with partial detachment from one endwall with a round-shaped tip structure. A flat-tip pin-fin with partial detachment and a traditional pin-fin with full attachment serve as references. Reynolds-averaged Navier-Stokes equations and the shear-stress-transport turbulence model are applied. Influences of initial mist temperature, initial mist diameter and initial mist velocity are analyzed in the Reynolds number range 15,000 to 50,000. The round-tip pin-finned channel has highest heat transfer coefficient and lowest pressure loss among the structures. Heat transfer enhancement increases first gradually and then decreases sharply with increasing initial mist diameter but an optimal diameter exists for the highest Nusselt numbers. Nusselt number decreases monotonically with increasing initial mist temperature. Droplet movement and heat transfer are nearly independent of initial mist velocity.</p>},
  author       = {Ye, Lv and Yang, Xing and Sunden, Bengt and Feng, Zhenping},
  issn         = {1040-7782},
  language     = {eng},
  number       = {5},
  pages        = {291--308},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer; Part A: Applications},
  title        = {Effect of droplet characteristics on heat transfer of mist/air cooling in a pin-finned channel},
  url          = {http://dx.doi.org/10.1080/10407782.2019.1586426},
  volume       = {75},
  year         = {2019},
}