An Experimental Study of Vortex Formation of a Circular Cylinder with Serrated Fins

Serrated Fin Tube 후류에 대한 유동가시화 적용 및 근접후류 특성에 관한 연구

  • 부정숙 (부산대학교 기계공학부, 기계기술연구소) ;
  • 김경천 (부산대학교 기계공학부, 기계기술연구소) ;
  • 류병남 (부산대학교 대학원 기계공학과)
  • Published : 2002.11.01


An experimental study is performed to investigate the characteristics of near wake behind a circular cylinder with serrated fins using the constant temperature anemometer and through flow visualization. Previous report(Boo at al., 2001) shows that there are three different modes in vortex shedding behavior. This paper is focused on the identification of the physical reasons why the difference is occured in vortex shedding. The through flow velocity crossing fins decreases as increasing fin height and decreasing fin pitch mainly due to the flow resistence. Vortex shedding is affected strongly by velocity distribution around fin tube, especially by the velocity gradient. The velocity distribution at X/d=0.0 has lower gradient with increasing freestream velocity and fin height and decreasing fin pitch. Those differences in velocity gradients generate different vortex shedding mechanism.