Simple Image-Separation Method for Measuring Two-Phase Flow of Freely Rising Single Bubble

상승하는 단일 버블 이상유동의 PIV 계측을 위한 영상분리기법

  • 박상민 (서울대학교 대학원 기계항공공학부) ;
  • 진송완 (서울대학교 대학원 기계항공공학부) ;
  • 김원태 (서울대학교 대학원 기계항공공학부) ;
  • 성재용 ((주)LG 전자 디지털어플라이언스(연)) ;
  • 유정열 (서울대학교 기계항공공학부)
  • Published : 2002.11.01


A novel two-phase PIV algorithm using a single camera has been proposed, which introduces a method of image-separation into respective phase images, and is applied to freely rising single bubble. Gas bubble, tracer particle and background each have different gray intensity ranges on the same image frame when reflection and dispersion in the phase interface are intrinsically eliminated by optical filters and fluorescent material. Further, the signals of the two phases do not interfere with each other. Gas phase velocities are obtained from the separated bubble image by applying the two-frame PTV. On the other hand, liquid phase velocities are obtained from the tracer particle image by applying the cross-correlation algorithm. Moreover, in order to increase the SNR (signal-to-noise ratio) of the cross-correlation of tracer particle image, image enhancement is employed.