Steam bubble collapse velocity measurements with a particle image velocimetry technique using fluorescent tracers
- Texas A M Univ., College Station (United States)
Particle image velocimetry (PIV) is a flow visualization method that can produce qualitative and quantitative full-field maps for fluid flow parameters (such as velocity and shear stress) over an extended area. The use of digital cameras for data acquisition to study high-speed fluid flows is usually limited by the camera frame acquisition rate. The velocity of the fluid under study must be limited to ensure that particles suspended in the flow field remain in the camera's focal plane in successive images. The use of digital cameras for data acquisition is desirable to simplify and expedite the data analysis. A method is presented in this paper that will measure changes in the flow field that occur at the relatively fast framing rate of 100 to 320 its per frame. However, to achieve this high framing rate, the laser will be operated in a double-pulse mode with one camera exposed twice. The directional ambiguity presented by the double exposure can be resolved by capturing a single exposure of the second pulse with a second digital camera. The study of collapsing steam bubbles also presents the problem of distinguishing between the light reflected by the liquid-gas interface and the light refracted by the surrounding tracer particles. This problem was resolved through the use of fluorescent seeds and appropriate filters. The fitter blocked most of the green light reflected by the bubbles and passed the red light emitted by the fluorescent seeds.
- OSTI ID:
- 5769112
- Report Number(s):
- CONF-930601-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 68; Conference: American Nuclear Society (ANS) annual meeting, San Diego, CA (United States), 20-24 Jun 1993; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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