Abstract
In micro-PIV, reaching the optimum image density has always been difficult due to high displacement gradient, coagulation of particles at the inlet and due to particles adhering to the surface to name a few. The most widely used method is to take ensemble correlation average of multiple PIV images to extract the velocity field. However, this leads to low temporal resolution. Hence, a method with high temporal resolution is pivotal to study unsteady laminar flow in microfluidic application. This work aims at developing a new PIV algorithm which reduces the effective seeding density and at the same time yield similar if not higher SNR compared to conventional PIV. We call this algorithm Ψ-PIV. This method is suitable for steady and unsteady laminar flows which are generally found in microfluidic applications. The reliability and the precision of the new method as a function of particle image pairs is investigated by synthetic image analysis. The main advantage of Ψ-PIV is its ability to achieve higher temporal resolution from the typical micro-PIV raw images. The experimental investigation for the flow around a 2D cylinder in a Hele-Shaw cell showed that the Ψ-PIV results in a reduction by approximately a factor of 25 in the number of frames required compared to conventional PIV.
Original language | English |
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Title of host publication | Proceedings of the 19th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics |
Place of Publication | Lisboa, Portugal |
Publisher | Instituto Superior Técnico |
Pages | 1098-1106 |
Publication status | Published - 2018 |
Event | LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal Duration: 16 Jul 2018 → 19 Jul 2018 Conference number: 19 http://www.lisbon-lasersymposium.org/LXLASER2018 |
Conference
Conference | LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics |
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Abbreviated title | LXLASER2018 |
Country/Territory | Portugal |
City | Lisbon |
Period | 16/07/18 → 19/07/18 |
Internet address |
Keywords
- PIV processing
- Micro PIV
- Microfluidics
- stream-function
- streamline
- unsteady laminar flow