Hydrodynamics and Morphologies of Droplet Coalescence

Chen, Yongping; Shen, Chaoqun; Peterson, G. P.

doi:10.1021/acs.iecr.5b01459

Cited by 25 publications

(20 citation statements)

References 32 publications

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“…It should be noted that the large contact angle of superhydrophobic surfaces allows us to explore the long term growth of the liquid bridge. Chen et al 41 investigate the coalescence of a pendent droplet with a sessile droplet and find that the prefactor in region II is 0.87. 9 The follow prefactors in region I for water are measured by other researchers: 1.09, 7 1.14, 8 1.10.…”

Section: Transition Of Interface Curvature During the Liquid Bridge Gmentioning

confidence: 99%

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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In this work, the coalescence of two equal‐sized water droplets on superhydrophobic surfaces (SHSs) is experimentally investigated. The morphologies of droplet coalescence are observed from side‐view and bottom‐view using high‐speed camera system. The related morphology evolution and dynamics of droplet coalescence are explored. The dynamic behaviors of droplet coalescence on SHSs can be decomposed into liquid bridge growth, contact line evolution, and droplet jumping. The liquid bridge radius is proportional to the square root of time, whereas the dimensionless prefactor is decreased from 1.18 to 0.83 due to the transition of interface curvature. The retraction velocity of the contact line shows limited dependence on initial droplet radii as the retraction dynamics considered here are governed by the capillary–inertial effect. The coalesced droplet finally departs the substrate with a dimensionless jumping velocity of around 0.2. A heuristic argument is made to account for the nearly constant dimensionless jumping velocity. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2913–2921, 2018

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Section: Transition Of Interface Curvature During the Liquid Bridge Gmentioning

confidence: 99%

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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“…system by 21-76 ∘ C compared with that of the CE resin. 12 Additionally, phosphorus-containing hybridized multiwalled carbon nanotubes (PMWCNTs) lowered the curing temperature of PMWCNT/CE composites by 45-71 ∘ C. 13 Poly(silylene-arylacetylene) (PSA) resin is a highly heat-resistant hybrid polymer with -Si-C≡C-Ar-C≡C-units. The cyclotrimerization and Diels-Alder addition of PSA resin forms benzene and naphthalene structures in the crosslinked network by thermal self-polymerization.…”

Section: Introductionmentioning

confidence: 99%

Catalytic effect of poly(silicon‐containing arylacetylene) with terminal acetylene on the curing reaction and properties of a bisphenol A type cyanate ester

Cai

Yuan

Huang

2018

Polymer International

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Bisphenol A dicyanate ester (BADCy) was blended with an acetylene‐terminated poly(silicon‐containing arylacetylene) (PSA‐E) with acidic terminal acetylene groups to prepare a modified cyanate ester (BADCy/PSA‐E) via solution and evaporation. The curing reaction of the BADCy/PSA‐E was studied by DSC and in situ infrared monitoring. The curing initial temperature and peak temperature of the blended resin decreased by up to 95 and 57 °C, respectively. The PSA‐E could catalyze the curing reaction of BADCy. The thermal, dielectric and mechanical properties of the cured blended resins were further evaluated. The temperature at 5% mass loss of the cured blended BADCy with 20% mass fraction of PSA‐E increased from 361 to 426 °C, although the glass transition temperature (Tg) of the cured blended resin remained at 270 °C. The cured BADCy/PSA‐E blended resin exhibited a good thermal stability. The dielectric loss factor and mechanical properties of the cured BADCy decreased upon addition of the PSA‐E resin. However, the flexural strength and impact strength of the cured blended BADCy/PSA‐E resin exhibited values of 95 MPa and 21 kJ m−2, respectively. © 2018 Society of Chemical Industry

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“…In addition, several attempts have also investigated the flow characteristics of liquid bridge between droplets in the initial stage, and have demonstrated that the temporal evolution of liquid bridge radius ( R b ) is in line with the scaling law R b ∝ t 0.5 . Additionally, the entire coalescence process of a pendent droplet and sessile one can be distinguished into three types of coalescence morphologies, and there is another scaling law for the liquid bridge expansion besides the well‐known one in the whole process . Note that, for the droplet coalescence in the air, the effect of the air can be negligible.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18] Additionally, the entire coalescence process of a pendent droplet and sessile one can be distinguished into three types of coalescence morphologies, and there is another scaling law for the liquid bridge expansion besides the well-known one in the whole process. [23] Note that, for the droplet coalescence in the air, the effect of the air can be negligible.…”

Section: Introductionmentioning

confidence: 99%

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Visualization study on coalescence of droplets with different sizes in external liquid

Shen

Liu

et al. 2017

Can J Chem Eng

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We experimentally investigate the coalescence between two droplets with different sizes in the surrounding water via high‐speed visualization. We identify three coalescence patterns by clarifying the dynamic interface evolutions, including liquid bridge evolution, capillary wave propagation, and pinch‐off behaviours. The results indicate that the coalescence patterns are directly related to the propagation of capillary waves on the coalescent droplet, which is governed by the competition among the capillary force, viscous force, and inertia involved in the draining from the original droplets into the liquid bridge. The external water can efficiently damp the oscillation in capillary wave propagation after the coalescence. In the inertial regime after the droplet coalescence, the evolution of liquid bridge is observed to follow a linear scaling law, when the capillary force induced by the azimuthal interface of the liquid bridge drives the liquid bridge expansion. Accordingly, a phase diagram is organized to characterize these coalescence patterns depending on Ohnesorge number, relative viscosity between external water and droplet, and size ratio between two coalesced droplets.

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Hydrodynamics and Morphologies of Droplet Coalescence

Cited by 25 publications

References 32 publications

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Catalytic effect of poly(silicon‐containing arylacetylene) with terminal acetylene on the curing reaction and properties of a bisphenol A type cyanate ester

Visualization study on coalescence of droplets with different sizes in external liquid

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