A Study on Flow Characteristics with Ultrasonic Forcing in a Coaxial Circular Pipe by PIV Measurement

동심원관내에서 초음파가 가진된 유동특성의 PIV계측에 의한 연구

  • 구자훈 (경상대학교 대학원) ;
  • 박영호 (경상대학교 대학원) ;
  • 최우창 (경상대학교 대학원) ;
  • 송민근 (경상대학교 대학원) ;
  • 주은선 (경상대학교 수송기계공학부, 항공기 부품기술 연구센터)
  • Published : 2000.11.02

Abstract

An experiment on the enhancement of turbulent flow with ultrasonic forcing was carried out by using PIV measurement in a coaxial circular pipe which could offer characteristics of the turbulence flow plentifully through its jet. A large transparent acryl tank and a coaxial circular pipe nozzle were made for the above research. city water of $25^{\circ}C$ was selected as an experimental liquid and the front flow field of the coaxial circular pipe was divided vertically as 3 measuring regions to observe characteristics of flow phenomena. characteristics of fluid flow such as velocity vector distribution, kinetic energy, turbulent intensity and etc. were visualized, observed, examined and considered at 5 kinds of Re No. such as $Re=1{\times}10^3,\;2{\times}10^3,\;3{\times}10^3,\;5{\times}10^3,\;1{\times}10^4$. In result it was proved that ultrasonic vibration affected the enhancement of turbulent flow.

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