University of Twente Student Theses


Laser-induced cavitation in light-absorbing liquids

Klein Schaarsberg, Martin H. (2012) Laser-induced cavitation in light-absorbing liquids.

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Abstract:This thesis presents an experimental and numerical study of laser-induced cavitation in capillary tubes. An experimental study of the influence of focal position of the laser reveals that cavitation bubble formation is enhanced when the laser focus is displaced from the capillary axis towards the laser. A numerical model based on a ray tracing method was developed to calculate the spatial energy absorption profile. Subsequently, a simple energy threshold model was used to obtain an estimation of the initial bubble volume.The estimation provides a good match with the experimentally observed trend and predicts an optimum position for the laser focus.The model may serve as a tool to optimize cavitation-based microfluidic systems, allowing study of the influence of the liquid absorptivity, the capillary diameter, the capillary wall thickness and the laser pulse energy and polarization on bubble formation.The local energy distribution, for which currently no adequate model exists, could also enhance the initial conditions of computational fluid dynamics models commonly used to describe cavitation dynamics.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Advanced Technology BSc (50002)
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