Coalescence and separation in binary collisions of liquid drops
Abstract
An extensive experimental investigation of the binary collision dynamics of water drops for size ratios of 1. 0.75, and 0.5, for the Weber-number range of 1 to 100, and for all impact parameters is reported. Two different types of separating collisions, namely reflexive and stretching separations, are identified. Reflexive separation is found to occur for near head-on collisions, while stretching separation occurs for large-impact-parameter collisions. The boundaries between both of the separating collisions and coalescence collision are found experimentally. Theoretical models for predictions of the reflexive and stretching separation are also given.
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Increasing the size ratio Δ promotes droplet coalescence but still leads to bouncing and separation.
“Although increasing Δ promotes droplet coalescence, 18,19,21 it still leads to bouncing and separation, as shown in the representative experimental images.”
From Droplet collision of hypergolic propellants (2024) · cites this paper as [18]
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- Authors
- Ashgriz, N., & Poo, J. Y.
- Affiliations
- University at Buffalo, State University of New York (US)
- ORCID
- Ashgriz, N.
- Venue
- Journal of Fluid Mechanics
- Publisher
- Cambridge University Press (CUP)
- Published
- 1990-12
- Volume
- 221
- Pages
- 183-204
- ISSN
- 0022-1120 (ISSN-L)
- 1469-7645
- OpenAlex
- W2017794846
- Cited by
- 753
- References
- 24
- Citations by year
- 2026: 34 · 2025: 38 · 2024: 31 · 2023: 43 · 2022: 46 · 2021: 37 · 2020: 37 · 2019: 36 · 2018: 28 · 2017: 45 · 2016: 24 · 2015: 30 · 2014: 18 · 2013: 23 · 2012: 31
- FWCI
- 2.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Fluid Mechanics (publishedVersion)
- Topics
- Physical Sciences › Engineering › Computational Mechanics › Fluid Dynamics and Heat Transfer
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrohydrodynamics and Fluid Dynamics
- Physical Sciences › Engineering › Computational Mechanics › Fluid Dynamics and Thin Films
- Keywords
- droplet coalescence, drop separation, water droplets, impact parameter, Weber number, collision dynamics, size ratio
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