1992 Fiscal Year Final Research Report Summary
THREE-DIMENSIONAL PTV MEASUREMENT OF MIXING FLOW BY BUBBLING JET IN A CYLINDRICAL VESSEL
| Project/Area Number |
02650484
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属精錬・金属化学
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
UEMURA Tomomasa Osaka University, Faculty of Engineering Science, Associate Professor, 基礎工学部, 助教授 (70029536)
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| Co-Investigator(Kenkyū-buntansha) |
IGUCHI Manabu Osaka University, Faculty of Engineering Science, Associate Professor, 工学部, 助教授 (00043993)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Image processing / Three-dimensional PTV / Three-dimensional PIV / Binary Image Correlation Method / Velocity Measurement / Mixing flow / Water model / Injection Metallurgy |
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| Research Abstract |
This project aims to measure three-dimensional motion and paths of fluid elements in a cylindrical water bath into which a bubbling jet is blown from the center of the bottom. Main effort is paid to develop a new efficient three-dimensional PTV method which can work on a personal computer system with a practical performance. In order to measure three-dimensional velocity vectors efficiently using a personal computer system, following three algorithms are newly developed:
1) Measuring method of three-dimensional co-ordinates of tracer particles.
2) A method for compensating the influence of refraction at the air-water boundary.
3) Algorithm of three-dimensional binary-image correlation method.
A two-camera-stereo system is planned for measuring three-dimensional co-ordinates of tracer particles at first, but it is found that the system is not reliable enough to determine stereo-pairs from a pair of pictures which contain more than 50 tracers. Then three-camera system is developed to satisfy the requested performance. Results of some preliminary experiments show satisfactorily performances of the measuring system.
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