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Bouncing, coalescence, and separation in head-on collision of unequal-size droplets
Abstract
The dynamics of head-on collision of unequal-size droplets were experimentally and theoretically investigated, with emphasis on identifying distinct collision outcomes and interpreting the size-ratio dependence. A unified regime diagram in terms of bouncing, permanent coalescence, and separation after coalescence was identified for hydrocarbon and water droplets in the parameter space of the size ratio and a collision Weber number. Experimental results show that the transition Weber number, Web-c, that separates the bouncing and permanent coalescence regimes, weakly depends on the size ratio, while the transition Weber number, Wec-s, that separates permanent coalescence and separation regimes, significantly increases with the size ratio. A theoretical model based on energy balance and scaling analysis was developed to explain the size-ratio dependence of Wec-s. The theoretical results show good agreement with the experimental data for tetradecane and decane droplets, with a moderate discrepancy for water droplets.
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“The results show that β = 0.7 for water droplets (α is not defined here because the bouncing outcome is absent for pure water droplet collision in the atmosphere environment), α = 0.25 and β = 0.8 for decane droplets, and α = 0.65 and β = 1.4 for tetradecane droplets.”
From Droplet collision of hypergolic propellants (2024) · cites this paper as [24]
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Metadata
- Authors
- Tang, C., Zhang, P., & Law, C. K.
- Affiliations
- Princeton University (US)
- Venue
- Physics of Fluids
- Publisher
- AIP Publishing
- Published
- 2012-02-01
- Volume
- 24
- Issue
- 2
- ISSN
- 1070-6631 (ISSN-L)
- 1089-7666
- OpenAlex
- W2068744655
- Cited by
- 164
- References
- 15
- Citations by year
- 2026: 17 · 2025: 17 · 2024: 19 · 2023: 21 · 2022: 12 · 2021: 14 · 2020: 10 · 2019: 14 · 2018: 7 · 2017: 12 · 2016: 4 · 2015: 6 · 2014: 6 · 2013: 3 · 2012: 2
- FWCI
- 5.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physics of Fluids (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 › Chemical Engineering › Fluid Flow and Transfer Processes › Particle Dynamics in Fluid Flows
- Keywords
- droplet collision, head-on collisions, droplet bouncing, energy balance model, scaling analysis, hydrocarbon droplets, water droplets, tetradecane, n-decane
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