Journal of the Korean Society of Visualization (한국가시화정보학회지)
- Volume 2 Issue 1
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- Pages.39-45
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- 2004
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- 1598-8430(pISSN)
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- 2093-808X(eISSN)
Time-Resolved Two-Phase PIV Measurements of Freely Rising Bubble Flows with an Image Separation Method
단일 카메라의 영상분리를 이용한 자유 상승 기포의 고속 이상 유동 PIV 계측
- Published : 2004.08.01
Abstract
A time-resolved two-phase PIV system using a single camera has been developed, 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 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 particles. 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. As a result, the bubble rises rectilinearly just after it is released from an injector and then has a zigzag motion in the far field. From the trajectory of the bubble, it is found that the period of the zigzag motion is closely related to the vortex shedding although the wavelength of it varies along its movement.
Keywords
- Time-Resolved Two-Phase PIV;
- Image Separation Method;
- Bubble Flow;
- Fluorescent Particles;
- Optical Filter
- 고속 이상유동 PIV;
- 영상분리기법;
- 기포 유동;
- 형광입자;
- 광학필터;