• Title/Summary/Keyword: Trapezoidal vortex generator

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Numerical Study on the Heat Transfer Enhancement of Trapezoidal Vortex Generator in a Rectangular Channel (사각채널에서 사다리꼴 와류발생기에 의한 열전달 촉진에 대한 수치해석)

  • Park, T.H.;Lee, S.R.
    • Journal of the Korean Society of Mechanical Technology
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    • v.20 no.6
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    • pp.852-857
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    • 2018
  • Vortex Generators are used in heat exchanger to enhance the heat transfer of air side. 3-D numerical analysis is performed on heat transfer characteristics of a channel with trapezoidal vortex generator. We investigate the effects of vortex generators with two different inclined angles to flow direction which are forward and backward vortex generators. The thermal hydraulic performance such as Nu and pressure drop, is compared quantitatively. The results show that vortex generator enhances the heat transfer by developing boundary layers and secondary flow in the downstream. The downwash flow region corresponds to the maximum Nu, while the upwash flow region corresponds to Nu minimum. In the view of the heat transfer characteristics, FVG is better than BVG. However, when flow is turbulent as Re increases, the pressure drop for FVG is higher than that for BVG.

NUMERICAL STUDY ON THE WAKE OF A SINGLE MICRO VORTEX GENERATOR (Single micro Vortex Generator의 후류에 대한 수치적 연구)

  • Kim, G.H.;Park, S.O.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.494-499
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    • 2011
  • One of the devices to prevent separated flow over a wing or a flap at high angle of attack is a vortex generator. In the present work, we numerically study the flow around a low-profile or micro vortex generator whose height is less than local boundary layer thickness which can delay separation with a minimum drag penalty owing to its very small wetted surface area. As a first step toward a parametric study to efficiently design this MVG flow control system, we simulate the flow around a single MVG on a flat plate. For the simulation, we employ OpenFOAM with Launder-Sharma ${\kappa}$-epsilon model. The analysis results are validated by comparing with experimental results of a rectangular MVG at an angle of attack of 10 degrees whose height is 20% of local boundary layer. Important results and aspects of this numerical study are discussed. We also simulate the flow around rectangular, triangular and trapezoidal MVGs and the results are compared

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