Collisions of droplets on spherical particles
File(s)1%2E5005124.pdf (16.18 MB) 770283_1_merged_1504281182.pdf (5.34 MB)
Published version
Accepted version
Author(s)
Charalampous, G
Hardalupas, I
Type
Journal Article
Abstract
Head-on collisions between droplets and spherical particles are examined for water droplets in the diameter range between 170 μm and 280 μm and spherical particles in the diameter range between 500 μm and 2000 μm. The droplet velocities range between 6 m/s and 11 m/s, while the spherical particles are fixed in space. The Weber and Ohnesorge numbers and ratio of droplet to particle diameter were between 92 < We < 1015, 0.0070 < Oh < 0.0089, and 0.09 < Ω < 0.55, respectively. The droplet-particle collisions are first quantified in terms of the outcome. In addition to the conventional deposition and splashing regimes, a regime is observed in the intermediate region, where the droplet forms a stable crown, which does not breakup but propagates along the particle surface and passes around the particle. This regime is prevalent when the droplets collide on small particles. The characteristics of the collision at the onset of rim instability are also described in terms of the location of the film on the particle surface and the orientation and length of the ejected crown. Proper orthogonal decomposition identified that the first 2 modes are enough to capture the overall morphology of the crown at the splashing threshold.
Date Issued
2017-10-17
Date Acceptance
2017-09-15
Citation
Physics of Fluids, 2017, 29 (10), pp.103305-1-103305-15
ISSN
1070-6631
Publisher
American Institute of Physics
Start Page
103305-1
End Page
103305-15
Journal / Book Title
Physics of Fluids
Volume
29
Issue
10
Copyright Statement
© 2017 Author(s). All article content,
except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
(http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5005124
except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
(http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5005124
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://aip.scitation.org/doi/10.1063/1.5005124
Grant Number
EP/K019732/1
Subjects
Science & Technology
Technology
Physical Sciences
Mechanics
Physics, Fluids & Plasmas
Physics
INDUSTRIAL SPRAY DRYERS
SINGLE DROP
CROWN FORMATION
SOLID-SURFACES
IMPACT
COALESCENCE
SPLASH
TIME
FILM
WALL
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Fluids & Plasmas
Publication Status
Published
Article Number
103305
Date Publish Online
2017-10-17