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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Michael, R. Brady Abiven, Claude Pavlos, P. Vlachos Papadopoulos, George |
| Copyright Year | 2002 |
| Abstract | This paper describes a first effort to investigate the feasibility of droplet size and shape characterization by direct laser sheet imaging using time resolved Digital Particle Image Velocimetry. A 60-degree conical, high-pressure spray generated a poly-dispersed droplet distribution. Measurements were preformed for seven planes parallel to the spray axis, and separated by 4mm. A CMOS camera recorded the DPIV images at sampling rate of 10 KHz. Advanced image processing techniques were employed to identify the droplets and individually resolve their velocity using a hybrid cross-correlation particle-tracking algorithm. Subsequently, the size distribution of each droplet was quantified using geometric optics theory to convert the droplet image information to the true droplet size. Finally, the entire volume of the spray velocity and size distributions was reconstructed in a time-averaged sense. The droplet sizes from our direct imaging DPIV system were validated using a Phase Doppler Particle Analyzer (PDPA). The calculated sizes from the direct imaging methodology were found to agree with the measured PDPA results for droplets images larger than the diffraction limited diameter. Resolution limitations introduced inaccuracy for smaller droplets. In addition, the shedding frequency of the spray ligament was observed to be on the order of 1KHz, demonstrating the feasibility of using a high speed, direct imaging system in the characterization of unsteady, liquid sheet breakup properties. This preliminary effort illustrates the potential of performing global time resolved velocity and size measurements using a simple DPIV configuration based on CMOS imaging technology. |
| Sponsorship | Fluids Engineering Division |
| Starting Page | 51 |
| Ending Page | 59 |
| Page Count | 9 |
| File Format | |
| ISBN | 0791836576 |
| DOI | 10.1115/IMECE2002-33174 |
| Volume Number | Fluids Engineering |
| Conference Proceedings | ASME 2002 International Mechanical Engineering Congress and Exposition |
| Language | English |
| Publisher Date | 2002-11-17 |
| Publisher Place | New Orleans, Louisiana, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Image processing Sprays Size measurement Complementary metal oxide semiconductors High pressure (physics) Algorithms Diffraction Lasers Imaging Particulate matter Drops Geometric optics Resolution (optics) Shapes |
| Content Type | Text |
| Resource Type | Article |
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