4.7 Article

Evolution of the cavity in a particle dispersion triggered by laser-induced breakdown

Journal

PHYSICS OF FLUIDS
Volume 34, Issue 7, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0097412

Keywords

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Funding

  1. National Research Foundation of Korea (NRF) - Korean government (MSIT and MOE) [2017R1A4A1015523, 2019R1I1A2A01060684, NRF-2021R1A6A3A13040106]
  2. Institute of Advanced Machines and Design, Institute of Engineering Research
  3. Interdisciplinary Research Initiatives Program by the College of Engineering and College of Medicine at Seoul National University
  4. National Research Foundation of Korea [2019R1I1A2A01060684, 2017R1A4A1015523] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study investigates the evolution of particle void region created by laser-induced breakdown in a particle-laden air flow using high-speed schlieren imaging and high-speed camera. The temporal and spatial characteristics of the void region and the factors controlling this phenomenon are discussed.
Focusing a laser beam to a spot within a particle-laden air flow can cause laser-induced breakdown, which generates a spherically expanding shockwave and ensuing hot gas vortex (HGV). This can cause an initially uniform spatial distribution of static particles to be scattered non-homogeneously, creating a particle void region (or cavity). High-speed schlieren imaging has been applied to investigate the propagation of this shockwave and deformation of the HGV. Evolution of the particle distribution has been captured by a high-speed camera. It has been found that the cavity evolves over three temporal phases: expansion, distortion, and separation. The cavity is first created as the shockwave expels the particles in the radial direction. Next, the cavity is distorted by the HGV and then separates into smaller cavities before finally disappearing due to mixing from the HGV. The temporal and spatial characteristics of the cavity and the mechanism by which it changes in each phase are discussed. Experiments were conducted at three different breakdown energies of 15, 49, and 103 mJ. Propagation speed of the shockwave and the size and strength of the HGV are found to be the main factors controlling this phenomenon. Published under an exclusive license by AIP Publishing.

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