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Numerical modelling of droplet rim fragmentation by laser-pulse impact using a multiscale two-fluid approach

Nykteri, G. & Gavaises, M. ORCID: 0000-0003-0874-8534 (2022). Numerical modelling of droplet rim fragmentation by laser-pulse impact using a multiscale two-fluid approach. Physical Review Fluids, 7(10), 103604. doi: 10.1103/PhysRevFluids.7.103604

Abstract

The present work examines the rim fragmentation of a millimeter-sized methyl-ethyl-ketone (MEK) droplet imposed by the impact of different millijoule nanosecond laser beams that correspond to droplet propulsion velocity values between 1.76 m/s and 5.09 m/s. The numerical investigation is conducted within a physically consistent and computationally efficient multiscale framework, using the Σ-Υ two-fluid model with dynamic local topology detection. Overall, the macroscopic droplet expansion and the obtained deforming shape show good agreement with the experimental observations. The influence of the laser beam energy on the droplet deformation and the evolution of the detached fragments from the rim is demonstrated. The physical mechanisms that determine the droplet expansion, including the expansion velocity and expansion rate, along with the effect of the surrounding air flow on the detached fragments, are addressed. Despite the visualization limitations inside the polydisperse cloud of fragments in the experimental results at higher laser energy, the evolution of fragments during the fragmentation process is quantified for the first time, and size distributions are obtained within the multiscale framework.

Publication Type: Article
Additional Information: ©2022 American Physical Society
Publisher Keywords: laser impact, droplet fragmentation, rim breakup, two-fluid model, multiscale model
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Science & Technology > Engineering
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