CHARACTERISTICS OF THE FLOW AND HEAT TRANSFER AROUND A WAVY CYLINDER

삼차원 원형주상체의 축방향 직경변화가 열.유동장에 미치는 영향

  • 이창열 (부산대학교 대학원 조선해양공학과) ;
  • 서장훈 (부산대학교 대학원 조선해양공학과) ;
  • 윤현식 (부산대학교 첨단조선공학센터) ;
  • 전호환 (부산대학교 조선해양공학과)
  • Published : 2008.03.26

Abstract

Three-dimensional characteristics of fluid flow and heat transfer around a wavy circular cylinder having sinusoidal variation in cross sectional area along the spanwise direction are numerically investigated using the immersed boundary method. The three different wavelengths of ${\pi}/4$, ${\pi}/3$ and ${\pi}/2$ and at the fixed wavy amplitude of 0.1 have been considered to investigate the effects of waviness on especially the forced convection heat transfer around a wavy cylinder when the Reynolds and Prandtl numbers are 300 and 0.71, respectively. The present computational results for a wavy cylinder are compared with those for a smooth cylinder. The time- and total surface-averaged Nusselt number for a wavy cylinder with is larger than that for a smooth cylinder, whereas that with ${\lambda}={\pi}/4$ and ${\pi}/3$ is smaller than that for a smooth cylinder. However, because the surface area exposed to heat transfer for a wavy cylinder is larger than that for a smooth cylinder, the total heat transfer rate for a wavy cylinder with different wavelengths of ${\lambda}={\pi}/4$, ${\pi}/3$ and ${\pi}/2$ is larger than that for a smooth cylinder.

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