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Open Access CC BY V4.0
Preprint
On Free Moving Micron-Sized Droplet-Particle Collisions
ArXiv.org
Cornell University
05/03/2026
Abstract
Predictive modelling of agglomeration in spray drying and particle capture in aerosol scavenging requires a fundamental understanding of droplet-particle collisions. The study complements prior work by investigating mid-air collisions between free micron-sized spherical droplets and particles with a size ratio of three. Particle wettability and density are varied to elucidate the mechanisms governing collision outcomes and the role of collision offset. Results show that particle density determines whether a particle is engulfed by the droplet or remains at the droplet interface during capture, while high wettability suppresses particle separation even in glancing collisions. A modified effective Weber number incorporating particle density and wettability is proposed to map collision outcomes. To assess its robustness, the present data are combined with literature results in a unified regime map. The regime boundaries separating collision outcomes collapse when the size ratio and Ohnesorge number are held constant. However, at a given collision offset, variations in size ratio and Ohnesorge number alter the critical effective Weber number for particle separation through changes in collision geometry and viscous resistance.
Details
- Title
- On Free Moving Micron-Sized Droplet-Particle Collisions
- Authors/Creators
- Tushar SrivastavaKarrar H Al-DirawiBenjamin LobelAndrew E Bayly
- Publication Details
- ArXiv.org
- Publisher
- Cornell University
- Identifiers
- 991005877710607891
- Murdoch Affiliation
- School of Mathematics, Statistics, Chemistry and Physics
- Language
- English
- Resource Type
- Preprint
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