On Free Moving Micron-Sized Droplet-Particle Collisions
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914373260279808 |
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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 |