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3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators

Lotfi, Babak; Zeng, Min; Sundén, Bengt LU and Wang, Qiuwang (2014) In Energy 73. p.233-257
Abstract
3D computational analysis was performed to investigate heat transfer and pressure drop characteristics of flow in SWFET (Smooth Wavy Fin-and-Elliptical Tube) heat exchanger with four new VGs (vortex generators), RTW (rectangular trapezoidal winglet), ARW (angle rectangular winglet), CARW (curved angle rectangular winglet) and WW (Wheeler wishbone). The numerical model was well validated with the available experimental results. Numerical results illustrate that vortex generators can bring about further heat transfer enhancement through careful adjustment of the position with respect to the elliptical tube, type and attack angle of vortex generators. The influences of the geometrical factors including attack angles of the winglets (alpha(vG)... (More)
3D computational analysis was performed to investigate heat transfer and pressure drop characteristics of flow in SWFET (Smooth Wavy Fin-and-Elliptical Tube) heat exchanger with four new VGs (vortex generators), RTW (rectangular trapezoidal winglet), ARW (angle rectangular winglet), CARW (curved angle rectangular winglet) and WW (Wheeler wishbone). The numerical model was well validated with the available experimental results. Numerical results illustrate that vortex generators can bring about further heat transfer enhancement through careful adjustment of the position with respect to the elliptical tube, type and attack angle of vortex generators. The influences of the geometrical factors including attack angles of the winglets (alpha(vG) = 15 degrees,30 degrees,45 degrees,60 degrees and 75 degrees) and width/length aspect ratio (w/l = 0.5,1.0) of the Wheeler wishbones on enhancing the heat transfer performance of a smooth wavy fin heat exchanger with a three-row staggered elliptical tube bundle are investigated. A parametric study on the winglet vortex generators indicated that for the small attack angle, CARW vortex generators gives better thermohydraulic performance under the present conditions. The best thermal performance with winglet VGs in larger attack angle, was obtained at RTW VGs arrangement. For the SWFET heat exchangers, the WW VGs with w/l = 0.5 provide the best heat transfer performance. (C) 2014 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Smooth wavy fin-and-elliptical tube heat exchanger, Vortex generators, Wheeler wishbone, Augmented heat transfer, SST k-omega turbulence model, CFD simulation
in
Energy
volume
73
pages
233 - 257
publisher
Elsevier
external identifiers
  • wos:000341334200021
  • scopus:84905720761
ISSN
1873-6785
DOI
10.1016/j.energy.2014.06.016
language
English
LU publication?
yes
id
ac1e4f53-1b73-4bb1-bc30-5a09f1f4cee3 (old id 4714039)
date added to LUP
2014-11-06 11:41:35
date last changed
2017-10-22 03:01:17
@article{ac1e4f53-1b73-4bb1-bc30-5a09f1f4cee3,
  abstract     = {3D computational analysis was performed to investigate heat transfer and pressure drop characteristics of flow in SWFET (Smooth Wavy Fin-and-Elliptical Tube) heat exchanger with four new VGs (vortex generators), RTW (rectangular trapezoidal winglet), ARW (angle rectangular winglet), CARW (curved angle rectangular winglet) and WW (Wheeler wishbone). The numerical model was well validated with the available experimental results. Numerical results illustrate that vortex generators can bring about further heat transfer enhancement through careful adjustment of the position with respect to the elliptical tube, type and attack angle of vortex generators. The influences of the geometrical factors including attack angles of the winglets (alpha(vG) = 15 degrees,30 degrees,45 degrees,60 degrees and 75 degrees) and width/length aspect ratio (w/l = 0.5,1.0) of the Wheeler wishbones on enhancing the heat transfer performance of a smooth wavy fin heat exchanger with a three-row staggered elliptical tube bundle are investigated. A parametric study on the winglet vortex generators indicated that for the small attack angle, CARW vortex generators gives better thermohydraulic performance under the present conditions. The best thermal performance with winglet VGs in larger attack angle, was obtained at RTW VGs arrangement. For the SWFET heat exchangers, the WW VGs with w/l = 0.5 provide the best heat transfer performance. (C) 2014 Elsevier Ltd. All rights reserved.},
  author       = {Lotfi, Babak and Zeng, Min and Sundén, Bengt and Wang, Qiuwang},
  issn         = {1873-6785},
  keyword      = {Smooth wavy fin-and-elliptical tube heat exchanger,Vortex generators,Wheeler wishbone,Augmented heat transfer,SST k-omega turbulence model,CFD simulation},
  language     = {eng},
  pages        = {233--257},
  publisher    = {Elsevier},
  series       = {Energy},
  title        = {3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators},
  url          = {http://dx.doi.org/10.1016/j.energy.2014.06.016},
  volume       = {73},
  year         = {2014},
}