The effect of the liquid layer thickness on the dissolution of immersed surface droplets

Qingguang Xie (Corresponding author), Jens Harting (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Droplets on a liquid-immersed solid surface are key elements in many applications, such as high-throughput chemical analysis and droplet-templated porous materials. Such surface droplets dissolve when the surrounding liquid is undersaturated and the dissolution process is usually treated analogous to a sessile droplet evaporating in air. Typically, theoretical models predict the mass loss rate of dissolving droplets as a function of droplet geometrical factors (radius, constant angle), and droplet material properties (diffusion constant and densities), where the thickness of the surrounding liquid layer is neglected. Here, we investigate, both numerically and theoretically, the effect of the liquid layer thickness on the dissolution of surface droplets. We perform 3D lattice Boltzmann simulations and obtain the density distribution and time evolution of droplet height during dissolution. Moreover, we find that the dissolution slows down and the lifetime linearly increases with increasing the liquid layer thickness. We propose a theoretical model based on a quasistatic diffusion equation which agrees quantitatively with simulation results for thick liquid layers. Our results offer insight to the fundamental understanding of dissolving surface droplets and can provide valuable guidelines for the design of devices where the droplet lifetime is of importance.
LanguageEnglish
Pages6461-6468
JournalSoft Matter
Volume15
Issue number32
DOIs
StatePublished - 8 Jul 2019

Fingerprint

dissolving
Dissolution
Liquids
liquids
life (durability)
porous materials
chemical analysis
solid surfaces
density distribution
simulation
radii
air
Porous materials
Materials properties
Throughput
Air
Chemical analysis

Keywords

  • Physics - Fluid Dynamics
  • Condensed Matter - Soft Condensed Matter

Cite this

@article{fcc82e20f5f44210806aed9372a524e7,
title = "The effect of the liquid layer thickness on the dissolution of immersed surface droplets",
abstract = "Droplets on a liquid-immersed solid surface are key elements in many applications, such as high-throughput chemical analysis and droplet-templated porous materials. Such surface droplets dissolve when the surrounding liquid is undersaturated and the dissolution process is usually treated analogous to a sessile droplet evaporating in air. Typically, theoretical models predict the mass loss rate of dissolving droplets as a function of droplet geometrical factors (radius, constant angle), and droplet material properties (diffusion constant and densities), where the thickness of the surrounding liquid layer is neglected. Here, we investigate, both numerically and theoretically, the effect of the liquid layer thickness on the dissolution of surface droplets. We perform 3D lattice Boltzmann simulations and obtain the density distribution and time evolution of droplet height during dissolution. Moreover, we find that the dissolution slows down and the lifetime linearly increases with increasing the liquid layer thickness. We propose a theoretical model based on a quasistatic diffusion equation which agrees quantitatively with simulation results for thick liquid layers. Our results offer insight to the fundamental understanding of dissolving surface droplets and can provide valuable guidelines for the design of devices where the droplet lifetime is of importance.",
keywords = "Physics - Fluid Dynamics, Condensed Matter - Soft Condensed Matter",
author = "Qingguang Xie and Jens Harting",
year = "2019",
month = "7",
day = "8",
doi = "10.1039/c9sm01048c",
language = "English",
volume = "15",
pages = "6461--6468",
journal = "Soft Matter",
issn = "1744-683X",
publisher = "Royal Society of Chemistry",
number = "32",

}

The effect of the liquid layer thickness on the dissolution of immersed surface droplets. / Xie, Qingguang (Corresponding author); Harting, Jens (Corresponding author).

In: Soft Matter, Vol. 15, No. 32, 08.07.2019, p. 6461-6468.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The effect of the liquid layer thickness on the dissolution of immersed surface droplets

AU - Xie,Qingguang

AU - Harting,Jens

PY - 2019/7/8

Y1 - 2019/7/8

N2 - Droplets on a liquid-immersed solid surface are key elements in many applications, such as high-throughput chemical analysis and droplet-templated porous materials. Such surface droplets dissolve when the surrounding liquid is undersaturated and the dissolution process is usually treated analogous to a sessile droplet evaporating in air. Typically, theoretical models predict the mass loss rate of dissolving droplets as a function of droplet geometrical factors (radius, constant angle), and droplet material properties (diffusion constant and densities), where the thickness of the surrounding liquid layer is neglected. Here, we investigate, both numerically and theoretically, the effect of the liquid layer thickness on the dissolution of surface droplets. We perform 3D lattice Boltzmann simulations and obtain the density distribution and time evolution of droplet height during dissolution. Moreover, we find that the dissolution slows down and the lifetime linearly increases with increasing the liquid layer thickness. We propose a theoretical model based on a quasistatic diffusion equation which agrees quantitatively with simulation results for thick liquid layers. Our results offer insight to the fundamental understanding of dissolving surface droplets and can provide valuable guidelines for the design of devices where the droplet lifetime is of importance.

AB - Droplets on a liquid-immersed solid surface are key elements in many applications, such as high-throughput chemical analysis and droplet-templated porous materials. Such surface droplets dissolve when the surrounding liquid is undersaturated and the dissolution process is usually treated analogous to a sessile droplet evaporating in air. Typically, theoretical models predict the mass loss rate of dissolving droplets as a function of droplet geometrical factors (radius, constant angle), and droplet material properties (diffusion constant and densities), where the thickness of the surrounding liquid layer is neglected. Here, we investigate, both numerically and theoretically, the effect of the liquid layer thickness on the dissolution of surface droplets. We perform 3D lattice Boltzmann simulations and obtain the density distribution and time evolution of droplet height during dissolution. Moreover, we find that the dissolution slows down and the lifetime linearly increases with increasing the liquid layer thickness. We propose a theoretical model based on a quasistatic diffusion equation which agrees quantitatively with simulation results for thick liquid layers. Our results offer insight to the fundamental understanding of dissolving surface droplets and can provide valuable guidelines for the design of devices where the droplet lifetime is of importance.

KW - Physics - Fluid Dynamics

KW - Condensed Matter - Soft Condensed Matter

U2 - 10.1039/c9sm01048c

DO - 10.1039/c9sm01048c

M3 - Article

VL - 15

SP - 6461

EP - 6468

JO - Soft Matter

T2 - Soft Matter

JF - Soft Matter

SN - 1744-683X

IS - 32

ER -