University of Twente Student Theses


Building a test setup for pulsed laser ablation in liquid flow

Stöver, P. J. (2021) Building a test setup for pulsed laser ablation in liquid flow.

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Abstract:The goal of this report is to create a test setup that can create predictable and repeatable flow conditions to facilitate nanosecond pulsed laser ablation in a liquid flow. For this purpose a channel with an internal cross-section of 5 by 25mm and a hydraulic entrance length of 543mm was designed. This design allows a fully developed flow with a known velocity profile to be created for a Reynolds number up to 2000. The velocity profile was verified with a PIV analysis. The hydraulic system is able to create a flow up to a Reynolds number of 11721. After the verification of the velocity profile, the channel was mounted on the optical table and integrated in the laser control system via a Arduino microcontroller. The microcontroller allowed a big part of the experiment to be automated. The channel was tested with a range of pulse energies, pulse frequencies and flow speeds. Cavitation bubbles and persistent bubbles have been imaged both, verifying that the integration of the channel with the laser system was successful. However, problems with bubbles introduced by the flow need to remedied to be able to do research on the persistent bubbles interaction with the liquid flow.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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