Microjet formation in a capillary by laser-induced cavitation

ORAL

Abstract

A vapor bubble is created by focusing a laser pulse inside a capillary that is partially filled with water. Upon creation of the bubble, a shock wave travels through the capillary. When this shock wave meets the meniscus of the air-water interface, a thin jet is created that travels at very high speeds. A crucial ingredient for the creation of the jet is the shape of the meniscus, which is responsible for focusing the energy provided by the shock wave. We examine the formation of this jet numerically using a boundary integral method, where we prepare an initial interface at rest inside a tube with a diameter ranging from 50 to 500 $\mathrm{\mu m}$. To simulate the effect of the bubble we then apply a short, strong pressure pulse, after which the jet forms. We investigate the influence of the shape of the meniscus, and pressure amplitude and duration on the jet formation. The jet shape and velocity obtained by the simulation compare well with experimental data, and provides good insight in the origin of the jet.

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Authors

  • Ivo R. Peters

    University of Twente, The Netherlands

  • Yoshiyuki Tagawa

    The University of Twente, University of Twente, The Netherlands, Physics of Fluids Group, University of Twente

  • Devaraj van der Meer

    University of Twente, Physics of Fluids, University of Twente, The Netherlands, University of Twente, The Netherlands

  • Andrea Prosperetti

    Johns Hopkins University, University of Twente, The Netherlands, Johns Hopkins University and University of Twente, The Netherlands

  • Chao Sun

    The University of Twente, University of Twente, Physics of Fluids group, University of Twente, University of Twente, The Netherlands, Physics of Fluids Group, University of Twente

  • Detlef Lohse

    The University of Twente, University of Twente, Physics of Fluids group, University of Twente, Physics of Fluids, Twente University, The Netherlands, University of Twente, The Netherlands, Physics of Fluids, University of Twente, Physics of Fluids Group, University of Twente