Proceedings of the KSME Conference (대한기계학회:학술대회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Ultrasonic Effect for Turbulence Enhancement in the Flow Field of a Coaxial Circular Pipe

동심원관 유동장에서 난류증진을 위한 초음파 영향에 관한 연구

  • 송민근 (경상대학교 대학원) ;
  • 구자훈 (경상대학교 대학원) ;
  • 이상범 (경상대학교 대학원) ;
  • 손승우 (경상대학교 대학원) ;
  • 주은선 (경상대학교 수송기계공학부, 항공기부품기술연구센터, 생산기술연구소)
  • Published : 2001.06.27
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Abstract

A study on the ultrasonic effect for turbulence enhancement is carried out in the horizontal flow field of a coaxial circular pipe. A large transparent acryl tank is made to perform several experiments for the above research. The front flow field from jet exit is divided as 4 measuring regions to observe characteristics of the above flow field according to those with and without ultrasonic. An ultrasonic transducer with 2MHz high frequency is used to give them the ultrasonic forcing. Characteristics such as the velocity distribution, the kinetic energy and the turbulence intensity are visualized, observed, examined and considered at Re No. 2000. In results, it is clarified that the ultrasonic increases the turbulence enhancement. And the optimum and harmonious intensity suited to the power of flow is needed to maximize the turbulence enhancement.

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