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Spray and microjets produced by focusing a laser pulse into a hemispherical drop

Phys. Fluids 21, 112101 (2009); doi:10.1063/1.3253394

Published 2 November 2009

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S. T. Thoroddsen,1 K. Takehara,2 T. G. Etoh,2 and C.-D. Ohl3
1Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
2Department of Civil and Environmental Engineering, Kinki University, Higashi-Osaka 577-8502, Japan
3School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, 637371 Singapore
We use high-speed video imaging to study laser disruption of the free surface of a hemispheric drop. The drop sits on a glass surface and the Nd:YAG (yttrium aluminum garnet) laser pulse propagates through the drop and is focused near the free surface from below. We focus on the evolution of the cylindrical liquid sheet and spray which emerges out of the drop and resembles typical impact crowns. The tip of the sheet emerges at velocities over 1 km/s. The tip of the crown breaks up into fine spray some of which is sucked back into the growing cavity at about 100 m/s. We measure the size of the typical spray droplets to be about 3  µm. We also show the formation of fine microjets, which are produced when the laser is focused inside the drop and the shock front hits small bubbles sitting under the free surface. For water these microjets are 5–50  µm in diameter and exit at 100–250 m/s. For higher viscosity drops, these jets can emerge at over 500 m/s. ©2009 American Institute of Physics
History: Received 21 April 2009; accepted 9 September 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/112101/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.15.Uv
    Laminar jets
  • 47.27.wg
    Turbulent jets
  • 47.55.dp
    Cavitation and boiling
  • 47.40.Nm
    Shock-wave interactions and shock effects
  • 47.80.Jk
    Flow visualization and imaging
  • 66.20.-d
    Viscosity of liquids; diffusive momentum transport
  • YEAR: 2009

PUBLICATION DATA

ISSN:
1070-6631 (print)   1089-7666 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (48)
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