Effect of intensified cavitation using poly(vinyl alcohol) microbubbles on spray atomization characteristics in microscale

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Abbasiasl, Taher and Niazi, Soroush and Sheibani Aghdam, Araz and Chen, Hongjian and Cebeci, Fevzi Çakmak and Ghorbani, Morteza and Grishenkov, Dmitry and Koşar, Ali (2020) Effect of intensified cavitation using poly(vinyl alcohol) microbubbles on spray atomization characteristics in microscale. AIP Advances, 10 (2). ISSN 2158-3226

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Abstract

In this study, cavitating flows inside a transparent cylindrical nozzle with an inner diameter of 0.9 mm were visualized, and the effect of cavitation on atomization characteristics of emerging sprays was investigated. Different patterns of cavitating flows inside the nozzle were visualized using a high-speed camera. In-house codes were developed to process the captured images to study the droplet size distribution and droplet velocity in different flow regimes. The results show that cavitating flows at the microscale have significant effects on atomization characteristics of the spray. Two working fluids, namely, water and poly(vinyl alcohol) microbubble (PVA MB) suspension, were employed. Accordingly, the injection pressures were detected as 690 kPa, 1035 kPa, and 1725 kPa for cavitation inception, supercavitation, and hydraulic flip flow regimes in the case of water, respectively. The corresponding pressures for the aforementioned patterns for PVA MB suspension were 590 kPa, 760 kPa, and 1070 kPa, respectively. At the microscale, as a result of a higher volume fraction of cavitation bubbles inside the nozzle, there is no large difference between the cavitation numbers corresponding to cavitating and hydraulic flip flows. Although the percentage of droplets with diameters smaller than 200 μm was roughly the same for both cases of water and PVA MB suspension, the Sauter mean diameter was considerably lower in the case of PVA MBs. Moreover, higher droplet velocities were achieved in the case of PVA MBs at lower injection pressures.
Item Type: Article
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Mechatronics
Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Ali Koşar
Date Deposited: 27 Aug 2020 14:45
Last Modified: 29 Jul 2023 22:31
URI: https://research.sabanciuniv.edu/id/eprint/40049

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