Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Fundamental Study on Heat Transfer Enhancement Effect of Microscale Surface Wrinkles

마이크로 표면주름 형상에 따른 열전달 촉진효과 기초연구

  • Park, Hee-Jin (Graduate School of Mechanical Engineering, Pusan National University) ;
  • Park, Sang-Hu (School of Mechanical Engineering, ERC/NSDM, Pusan National)
  • 박희진 (부산대학교 기계공학부 대학원) ;
  • 박상후 (부산대학교 기계공학부/정밀정형 및 금형가공 연구소)
  • Received : 2014.06.19
  • Accepted : 2014.08.11
  • Published : 2014.09.10
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Abstract

We evaluated heat transfer characteristics of microscale wrinkles using a CFD (computational fluid dynamics) analysis. In order to verify the heat transfer effect of wrinkles having various shapes, we introduce wrinkling processes to generate few different shapes of wrinkles such as macroscale ($200{\sim}400{\mu}m$ width), microscale ($10{\sim}30{\mu}m$ width), and hierarchical (microscale on macroscale wrinkle) wrinkles, using repetitive-dividing-volume (RDV) method for single-shape of wrinkles and connected method of UV-weakly polymerization with thermal curing for hierarchical structure of winkles. The analysis results of simplified CFD model showed that heat flux on heated plate was changed by the shape of wrinkles on the plate. The increase in heat flux of about 2.6 times was achieved in the case where hierarchical wrinkle structure was used.

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