Journal of the Korean Society of Mechanical Technology (한국기계기술학회지)

Korean Society of Mechanical Technology (한국기계기술학회)
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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. (Dept. of Mechanical & Automotive Engineering, Seoul National University of Science and Technology) ;
  • Lee, S.R. (Dept. of Mechanical & Automotive Engineering, Seoul National University of Science and Technology)
  • Received : 2018.11.01
  • Accepted : 2018.11.29
  • Published : 2018.12.28
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Abstract

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.

Keywords

Acknowledgement

Supported by : 서울과학기술대학교

References

  1. J. Y. Kim, S. C. Park, and S. R. Lee, "Numerical Analysis on Heat Transfer Characteristics by Changing Pitch Length of a Spiral type EGR Cooler," J. Korean Soc. Mech. Technol, Vol. 17, No. 5, pp. 949-954, 2015 https://doi.org/10.17958/ksmt.17.5.201510.949
  2. A. M. Jacobi and R. K. Shah, "Heat Transfer Surface Enhancement Through the Use of Longitudinal Vortices : A Review of Recent Progress," Experimental Thermal and Fluid Science, Vol. 11, pp. 295-309, 1995 https://doi.org/10.1016/0894-1777(95)00066-U
  3. M. Fiebig, "Embedded Vortices in Internal Flow: Heat Transfer and Pressure loss Enhancement," International Journal Heat and Fluid Flow, Vol. 16, pp. 376-388, 1995 https://doi.org/10.1016/0142-727X(95)00043-P
  4. G. Zhou, and Q. Ye, "Experimental investigations of thermal and flow characteristics of curved trapezoidal winglet type vortex generators," Applied Thermal Engineering, Vol. 37, pp. 241-248, 2012 https://doi.org/10.1016/j.applthermaleng.2011.11.024
  5. N. Matsudaira et al. "Visualization of the Heat Transfer Surface of EGR Cooler to Examine Soot Adhesion and Abruption Phenomena," SAE Technical Paper 2017-01-0127, 2017
  6. J. Hara, M. Iwasaki, and I. Honda, "Analysis of Unsteady Flow for Vortex generator Development for Heat exchangers," Vehicle Thermal Management Systems Conference and Exhibition, pp. 89-105, 2015
  7. H. M. Kaci et al. "Flow structure and heat transfer induced by embedded vorticity," International Journal of Heat and Mass transfer, Vol. 53, pp. 3575-3584, 2010 https://doi.org/10.1016/j.ijheatmasstransfer.2010.04.029
  8. Y. M. Oh and S. R. Lee, "A 3D Numerical Study on the Performance of Automotive Louvered Fin Heat Exchanger for Different Louver Angles," J. Korean Soc. Mech. Technol, Vol. 19, No. 2, pp. 235-241, 2017 https://doi.org/10.17958/ksmt.19.2.201704.235