Collective and convective effects compete in patterns of dissolving surface droplets

G. Laghezaa, E. Dietrich, J.M. Yeomans, R.A. Ledesma-Aguilar, Ernst S. Kooij, Henricus J.W. Zandvliet, Detlef Lohse

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

The effects of neighboring droplets on the dissolution of a sessile droplet, i.e. collective effects, are investigated both experimentally and numerically. On the experimental side small approximately 20 nL mono-disperse surface droplets arranged in an ordered pattern were dissolved and their size evolution is studied optically. The droplet dissolution time was studied for various droplet patterns. On the numerical side, lattice-Boltzmann simulations were performed. Both simulations and experiments show that the dissolution time of a droplet placed in the center of a pattern can increase by as much as 60% as compared to a single, isolated droplet, due to the shielding effect of the neighboring droplets. However, the experiments also show that neighboring droplets enhance the buoyancy driven convective flow of the bulk, increasing the mass exchange and counteracting collective effects. We show that this enhanced convection can reduce the dissolution time of droplets at the edges of the pattern to values below that of a single, isolated droplet.
Original languageGerman
Pages (from-to)5787-5796
JournalSoft matter
Volume12
DOIs
Publication statusPublished - 2016

Keywords

  • METIS-317157
  • IR-100728

Cite this

Laghezaa, G. ; Dietrich, E. ; Yeomans, J.M. ; Ledesma-Aguilar, R.A. ; Kooij, Ernst S. ; Zandvliet, Henricus J.W. ; Lohse, Detlef. / Collective and convective effects compete in patterns of dissolving surface droplets. In: Soft matter. 2016 ; Vol. 12. pp. 5787-5796.
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abstract = "The effects of neighboring droplets on the dissolution of a sessile droplet, i.e. collective effects, are investigated both experimentally and numerically. On the experimental side small approximately 20 nL mono-disperse surface droplets arranged in an ordered pattern were dissolved and their size evolution is studied optically. The droplet dissolution time was studied for various droplet patterns. On the numerical side, lattice-Boltzmann simulations were performed. Both simulations and experiments show that the dissolution time of a droplet placed in the center of a pattern can increase by as much as 60{\%} as compared to a single, isolated droplet, due to the shielding effect of the neighboring droplets. However, the experiments also show that neighboring droplets enhance the buoyancy driven convective flow of the bulk, increasing the mass exchange and counteracting collective effects. We show that this enhanced convection can reduce the dissolution time of droplets at the edges of the pattern to values below that of a single, isolated droplet.",
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Collective and convective effects compete in patterns of dissolving surface droplets. / Laghezaa, G.; Dietrich, E.; Yeomans, J.M.; Ledesma-Aguilar, R.A.; Kooij, Ernst S.; Zandvliet, Henricus J.W.; Lohse, Detlef.

In: Soft matter, Vol. 12, 2016, p. 5787-5796.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Collective and convective effects compete in patterns of dissolving surface droplets

AU - Laghezaa, G.

AU - Dietrich, E.

AU - Yeomans, J.M.

AU - Ledesma-Aguilar, R.A.

AU - Kooij, Ernst S.

AU - Zandvliet, Henricus J.W.

AU - Lohse, Detlef

PY - 2016

Y1 - 2016

N2 - The effects of neighboring droplets on the dissolution of a sessile droplet, i.e. collective effects, are investigated both experimentally and numerically. On the experimental side small approximately 20 nL mono-disperse surface droplets arranged in an ordered pattern were dissolved and their size evolution is studied optically. The droplet dissolution time was studied for various droplet patterns. On the numerical side, lattice-Boltzmann simulations were performed. Both simulations and experiments show that the dissolution time of a droplet placed in the center of a pattern can increase by as much as 60% as compared to a single, isolated droplet, due to the shielding effect of the neighboring droplets. However, the experiments also show that neighboring droplets enhance the buoyancy driven convective flow of the bulk, increasing the mass exchange and counteracting collective effects. We show that this enhanced convection can reduce the dissolution time of droplets at the edges of the pattern to values below that of a single, isolated droplet.

AB - The effects of neighboring droplets on the dissolution of a sessile droplet, i.e. collective effects, are investigated both experimentally and numerically. On the experimental side small approximately 20 nL mono-disperse surface droplets arranged in an ordered pattern were dissolved and their size evolution is studied optically. The droplet dissolution time was studied for various droplet patterns. On the numerical side, lattice-Boltzmann simulations were performed. Both simulations and experiments show that the dissolution time of a droplet placed in the center of a pattern can increase by as much as 60% as compared to a single, isolated droplet, due to the shielding effect of the neighboring droplets. However, the experiments also show that neighboring droplets enhance the buoyancy driven convective flow of the bulk, increasing the mass exchange and counteracting collective effects. We show that this enhanced convection can reduce the dissolution time of droplets at the edges of the pattern to values below that of a single, isolated droplet.

KW - METIS-317157

KW - IR-100728

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DO - 10.1039/C6SM00767H

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SP - 5787

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JO - Soft matter

JF - Soft matter

SN - 1744-683X

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