Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf ·...
Transcript of Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf ·...
![Page 1: Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf · Applicability of thermal particle tracer for monitoring very shallow overland flow velocities](https://reader036.fdocuments.net/reader036/viewer/2022090123/5ede8d16ad6a402d6669e09e/html5/thumbnails/1.jpg)
Applicability of thermal particle tracer for monitoring very shallow overland flow
velocitiesBabar Mujtaba, João L.M.P. de Lima
MARE - Marine and Environmental Sciences Centre,
Department of Civil Engineering, Universidade de Coimbra, Coimbra, Portugal.
1
![Page 2: Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf · Applicability of thermal particle tracer for monitoring very shallow overland flow velocities](https://reader036.fdocuments.net/reader036/viewer/2022090123/5ede8d16ad6a402d6669e09e/html5/thumbnails/2.jpg)
2
Velocity measuring techniques for flows depths of few millimeters
Dye Tracing PTV technique Thermal tracing
New thermal particle tracer-Cold oil droplets
![Page 3: Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf · Applicability of thermal particle tracer for monitoring very shallow overland flow velocities](https://reader036.fdocuments.net/reader036/viewer/2022090123/5ede8d16ad6a402d6669e09e/html5/thumbnails/3.jpg)
3
Methodology
•Eleven experiments•45-153 ml/s discharge•5,7,10 and 15% slope•0.3 × 0.27 m Interrogation window size•< 2mm flow depth•Four velocity measuring techniques1. Thermal imaging based PTV
technique (PTVi)2. Dye tracing3. Volumetric discharge method 4. Conventional PTV technique
(PTVc)
![Page 4: Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf · Applicability of thermal particle tracer for monitoring very shallow overland flow velocities](https://reader036.fdocuments.net/reader036/viewer/2022090123/5ede8d16ad6a402d6669e09e/html5/thumbnails/4.jpg)
44
Fundamental concept of thermal imaging based PTV technique (PTVi)
![Page 5: Applicability of thermal particle tracer for monitoring ... groups/MOXXI/8_Mujtaba.pdf · Applicability of thermal particle tracer for monitoring very shallow overland flow velocities](https://reader036.fdocuments.net/reader036/viewer/2022090123/5ede8d16ad6a402d6669e09e/html5/thumbnails/5.jpg)
5
Results and Discussion
For very shallow flows, PTVi technique can be an alternative to optical methods which are dependent on good illumination conditions, tracer’s visibility and tracking.
0.15 m
Dye tracing PTVc technique