On Free Moving Micron-Sized Droplet-Particle Collisions

Fuente: arXiv
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Hauptverfasser: Srivastava, Tushar, Al-Dirawi, Karrar H., Lobel, Benjamin, Bayly, Andrew E.
Format: Preprint
Veröffentlicht: 2026
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author Srivastava, Tushar
Al-Dirawi, Karrar H.
Lobel, Benjamin
Bayly, Andrew E.
author_facet Srivastava, Tushar
Al-Dirawi, Karrar H.
Lobel, Benjamin
Bayly, Andrew E.
contents 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.
format Preprint
id arxiv_https___arxiv_org_abs_2603_05749
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle On Free Moving Micron-Sized Droplet-Particle Collisions
Srivastava, Tushar
Al-Dirawi, Karrar H.
Lobel, Benjamin
Bayly, Andrew E.
Fluid Dynamics
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.
title On Free Moving Micron-Sized Droplet-Particle Collisions
topic Fluid Dynamics
url https://arxiv.org/abs/2603.05749