Suspended liquid particle disturbance on laser-induced blast wave and low density distribution

Ukai, T., Zare-Behtash, H. and Kontis, K. (2017) Suspended liquid particle disturbance on laser-induced blast wave and low density distribution. Physics of Fluids, 29(12), 126104. (doi:10.1063/1.4999042)

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Abstract

The impurity effect of suspended liquid particles on the laser-induced gas breakdown was experimentally investigated in quiescent gas. The focus of this study is the investigation of the influence of the impurities on the shock wave structure as well as the low density distribution. A 532 nm Nd:YAG laser beam with an 188 mJ/pulse was focused on the chamber filled with suspended liquid particles 0.9 ± 0.63 μm in diameter. Several shock waves are generated by multiple gas breakdowns along the beam path in the breakdown with particles. Four types of shock wave structures can be observed: (1) the dual blast waves with a similar shock radius, (2) the dual blast waves with a large shock radius at the lower breakdown, (3) the dual blast waves with a large shock radius at the upper breakdown, and (4) the triple blast waves. The independent blast waves interact with each other and enhance the shock strength behind the shock front in the lateral direction. The triple blast waves lead to the strongest shock wave in all cases. The shock wave front that propagates toward the opposite laser focal spot impinges on one another, and thereafter a transmitted shock wave (TSW) appears. The TSW interacts with the low density core called a kernel; the kernel then longitudinally expands quickly due to a Richtmyer-Meshkov-like instability. The laser-particle interaction causes an increase in the kernel volume which is approximately five times as large as that in the gas breakdown without particles. In addition, the laser-particle interaction can improve the laser energy efficiency.

Item Type:Articles (Editorial)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zare-Behtash, Dr Hossein and Kontis, Professor Konstantinos and Ukai, Dr Takahiro
Authors: Ukai, T., Zare-Behtash, H., and Kontis, K.
Subjects:Q Science > Q Science (General)
Q Science > QC Physics
T Technology > T Technology (General)
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Physics of Fluids
Publisher:AIP Publishing
ISSN:1070-6631
ISSN (Online):1089-7666
Published Online:13 December 2017
Copyright Holders:Copyright © 2017 AIP Publishing
First Published:First published in Physics of Fluids 29(12):126104
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
647261National Wind Tunnel FacilityFrank CotonEngineering and Physical Sciences Research Council (EPSRC)EP/L024888/1VPO (ACADEMIC & EDUCATIONAL INNOVATION)