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Cited by 340Fluid Dynamics and Heat TransferParticle Dynamics in Fluid FlowsElectrohydrodynamics and Fluid Dynamics

The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.

The interaction of falling water drops: coalescence

Brazier-Smith, P. R., Jennings, S. G., Latham, J.·1972·Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
DOI 10.1098/rspa.1972.0016
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Abstract

Experimental studies have been conducted of the interaction of falling water drops of radii R and r (R > r), density p and surface tension σ colliding in air with a relative velocity U and a perpendicular distance X between the centre of one drop and the undeflected trajectory of the other. R and r were varied from 150 to 750 μm, R/r from 1.0 to 2.5, U from 0.3 to 3.0 m s-1 and X from 0 (head-on collisions) to the maximum value for contact, R + r. Four types of interaction were observed: (1) bouncing; (2) permanent coalescence; (3) coalescence followed by separation; (4) coalescence followed by separation and the formation of satellite drops. The principal effort was devoted to a study of the critical conditions under which drops will separate after coalescence. It was found that there was a critical value of X, denoted by Xc, below which the coalesced drops remained united and above which there was sufficient angular momentum for the drops to separate after coalescence. For a wide range of values of r, R and U the coalescence efficiency e = Xe/(R + r)2 was found to lie between 0.1 and 0.4 for drops of identical size and about 0.2 and 0.6 for drops with R/r = 2.0. A theoretical analysis based on energy concepts predicted that the coalescence efficiency is given by the equation where f(R/r) is a function which varies from 1.3 for R/r = 1 and 3.8 for R/r = 3. The predictions of this equation were in excellent agreement with the experimental results over the entire range of conditions studied. Investigations are also described of the critical conditions for the bouncing of colliding drops, the influence of electric charges upon the interactions and the elongation and splitting of a rotating drop.

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Crossref · 10.1098/rspa.1972.0016

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  1. Davis M. H., 1964, Q. J.atmos. terr, Phys., 32, 355

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Metadata

Authors
Brazier-Smith, P. R., Jennings, S. G., & Latham, J.
Affiliations
University of Manchester (GB)
ORCID
Latham, J.
Venue
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
Publisher
The Royal Society
Published
1972-01-25
Volume
326
Issue
1566
Pages
393-408
ISSN
  • 0080-4630 (ISSN-L)
  • 2053-9169
DOI
10.1098/rspa.1972.0016
OpenAlex
W2145430824
Cited by
340
References
3
Citations by year
2026: 5 · 2025: 7 · 2024: 18 · 2023: 19 · 2022: 15 · 2021: 10 · 2020: 15 · 2019: 14 · 2018: 13 · 2017: 15 · 2016: 9 · 2015: 8 · 2014: 6 · 2013: 8 · 2012: 10
FWCI
5.99
Type
journal article
Language
en
Open access
closed
Licence
royalsociety.org/journals/ethics-policies/data-sharing-mining/ (tdm)
Locations
Proceedings of the Royal Society of London A Mathematical and Physical Sciences (publishedVersion)
Topics
  • Physical Sciences › Engineering › Computational Mechanics › Fluid Dynamics and Heat Transfer
  • Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Particle Dynamics in Fluid Flows
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrohydrodynamics and Fluid Dynamics
Keywords
droplet coalescence, droplet collision, coalescence efficiency, drop separation, satellite drops, angular momentum, drop bouncing, surface tension

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