A novel method is developed to capture and analyze several experimental flow regimes through a gross pollutant trap (GPT) with fully and partially blocked screens. Typical flow conditions and screen blockages are based on findings from field investigations that show a high content of organic matter in urban areas. Fluid motion of neutral buoyant particles is tracked using a high-speed camera and particle image velocimetry (PIV) software. The recorded fluid motion is visualized through an image-based, line integral convolution (LIC) algorithm, generally suitable for large computational fluid dynamics (CFD) datasets. The LIC method, a dense representation of streamlines, is found to be superior to the point-based flow visualization (e.g., hedgehog or arrow plots) in highlighting main flow features that are important for understanding litter capture and retention in the GPT. Detailed comparisons are made between the flow regimes, and the results are compared with CFD data previously obtained for fully blocked screens. The LIC technique is a useful tool for identifying flow structures in the GPT and areas that are subjected to abnormalities difficult to detect by conventional methods. The novel method is found to be useful both in the laboratory and in the field, with little preparation and cost. The enhancements and pitfalls of the LIC technique along with the experimentally captured flow field are presented and discussed.
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Gross pollutant trap
Computational fluid dynamics
Line integral convolution
Acoustic Doppler velocimeter
Particle image velocimetry
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The authors acknowledge C-M Concrete Pty Ltd. (Mr. Phil Thomas) for its ARC linkage grant support and Ms Sarita Gupta Madhani for assisting with field study and editing.
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Madhani, J.T., Young, J., Kelson, N.A. et al. A Novel Method to Capture and Analyze Flow in a Gross Pollutant Trap Using Image-Based Vector Visualization. Water Air Soil Pollut: Focus 9, 357 (2009). https://doi.org/10.1007/s11267-009-9225-y
- Line integral convolution (LIC)
- Gross pollutant trap (GPT)
- Flow visualizations