| Issue |
MATEC Web Conf.
Volume 369, 2022
40th Annual Conference - Meeting of the Departments of Fluid Mechanics and Thermomechanics in the connection with XXIII. International Scientific Conference - The Application of Experimental and Numerical Methods in Fluid Mechanics and Energy (40th. MDFMT & XXIII. AEaNMiFMaE-2022)
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| Article Number | 05003 | |
| Number of page(s) | 10 | |
| Section | Visualization of Flow | |
| DOI | https://doi.org/10.1051/matecconf/202236905003 | |
| Published online | 04 November 2022 | |
Multi-Exposure PIV Measurements of Velocity Fields in Sprays
Slovak University of Technology, Faculty of Mechanical Engineering, Námestie Slobody 17, 81231, Bratislava, Slovakia
* Corresponding author: marek.mlkvik@stuba.sk
This paper presents an approach to the use of the PIV method in the diagnosis of sprays generated by an effervescent atomiser. Due to the different density of the liquid phase depending on the distance from the nozzle, problems arise with the correct exposure of images for PIV analysis. The aim of the authors of this paper is to outline the possibility of solving this problem by composing a velocity field from partial measurements. To meet the objectives of the paper, in-house PIV equipment (hardware and software) was used rather than a commercial setup. This allowed for easier handling of the measured data and more sophisticated post-processing than offered by commercial products. It is clear from the results presented that, despite the fundamental differences in the optical properties of the spray particles, it is possible to obtain a velocity field from the discharge zone to the spray region with fine droplets. Moreover, it is possible to combine velocity measurements in the spray cone with measurements in the surrounding environment.
Research background: Spray is an environment with an abundance of tracers for PIV analysis (droplets), but their density, size and shape vary dramatically with distance from the nozzle. The use of PIV can therefore be challenging due to the demands of this method for correct image exposure.
Purpose of the article: Introduction of the application of the PIV method for environments with variable density and size of tracer particles
Methods: PIV, image processing.
Findings & Value added: By taking an appropriate approach to acquiring the source PIV images, it is possible to obtain information about the velocities throughout the spray cone as well as in the surrounding environment. The application of the proposed method requires a sufficiently large source data set (images) and sophisticated postprocessing. However, as a result, it is possible to obtain an overall view of the velocity field in the spray cone starting from the area behind the nozzle to the fine droplet region.
Key words: effervescent atomizer / liquid breakup / spray / particle image velocimetry / image acquisition
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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