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.
|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|
|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
|Conference||LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics|
|Period||16/07/18 → 19/07/18|
- PIV processing
- Micro PIV
- unsteady laminar flow
Kislaya, A., Deka, A., Veenstra, P., Tam, D., & Westerweel, J. (2018). Ψ-PIV: A novel framework to study unsteady microfluidic flows. In Proceedings of the 19th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics (pp. 1098-1106). Instituto Superior Técnico.