Droplet generation in ensembles of randomly corrugated ligaments
2021 (English)In: ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems, ILASS - Europe, Institute for Liquid Atomization and Spray Systems , 2021Conference paper, Published paper (Refereed)
Abstract [en]
This study focuses on a statistical description of droplet sizes, created as a result of capillary-induced breakup of ligaments. Direct numerical simulations of air-water systems are employed by solving the two-phase Navier-Stokes equations on adaptive Octree grids (http://basilisk.fr/), using the VOF methodology coupled with height-function-based curvature modeling. Breakup of individual ligaments are triggered by initial surface corrugations, the dynamics of which are deterministic. Stochasticity is introduced in the mix by conducting an ensemble of simulations of slender corrugated ligaments, each realization corresponding to a random but unique initial configuration. Probability density functions of the droplet sizes are computed for different ensemble sizes. These results (fig. 1) combining the effects of stochasticity with the capillarity-driven nonlinear dynamics are compared to the predictions of a Gaussian random process theory for near-monochromatic waves, which facilitate our understanding of the nature of drop size distributions encountered in realistic and convoluted fluid fragmentation scenarios.
Place, publisher, year, edition, pages
ILASS - Europe, Institute for Liquid Atomization and Spray Systems , 2021.
Keywords [en]
atomization, DNS of air-water systems, drop size distributions, Gamma distribution, ligaments
National Category
Computational Mathematics Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:kth:diva-342091Scopus ID: 2-s2.0-85180760548OAI: oai:DiVA.org:kth-342091DiVA, id: diva2:1826293
Conference
15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021, Edinburgh, United Kingdom of Great Britain and Northern Ireland, Aug 29 2021 - Sep 2 2021
Note
QC 20240111
2024-01-112024-01-112024-01-11Bibliographically approved