University of Twente Student Theses


Laser-induced cavitation in acoustically levitated droplets

Kerssens, P (2016) Laser-induced cavitation in acoustically levitated droplets.

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Abstract:In this internship, the behaviour of laser-induced cavitation bubbles in acoustically levitated water droplets has been investigated. Because such a bubble is confined in a small volume of liquid, a lot of interactions occur. Firstly, the bubble interacts with the droplet surface, creating fast jets emitted from the droplet surface. If the laser carries sufficient energy, the cavitation bubble can even rupture the droplet surface and create a liquid sheet, or even atomize the entire droplet. Secondly, shockwaves are emitted when the bubble is created and every time that the bubble collapses. These shockwaves also interact with the droplet, leading to capillary waves on the droplet surface, emission of jets from the droplet surface and the creation of short-lived secondary cavitation bubbles inside the water droplet. All of these phenomena have been captured with a high-speed camera during this internship, providing valuable insight into the physics governing this phenomenon. Additionally, 3D videos of the same phenomena have been recorded as well using a stereoscopic high-speed camera configuration. Lastly, the existing acoustic levitation setup has been improved to provide better levitation at lower input voltages.
Item Type:Internship Report (Master)
Nanyang Technological University, Singapore
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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