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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

In English

Författare

Summary, in English

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.

Avdelning/ar

Publiceringsår

2014

Språk

Engelska

Sidor

233-257

Publikation/Tidskrift/Serie

Energy

Volym

73

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Energy Engineering

Nyckelord

  • Smooth wavy fin-and-elliptical tube heat exchanger
  • Vortex generators
  • Wheeler wishbone
  • Augmented heat transfer
  • SST k-omega turbulence model
  • CFD simulation

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1873-6785