Diffusion dominated evaporation in multicomponent lattice Boltzmann simulations

Hessling, Dennis; Xie, Qingguang; Harting, Jens

doi:10.1063/1.4975024

Cited by 22 publications

(35 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• Lattice Boltzmann (LB) methods [50] -coarse-grained versions of the molecular theory of fluids enabling massive parallelization -have been adopted and applied to multiphase flows [51,52], including the selective evaporation or dissolution of multicomponent droplets [53].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical hydrodynamics of droplets out of equilibrium

2020

View full text Add to dashboard Cite

Droplets abound in nature and technology. In general, they are multicomponent, and, when out of equilibrium, with gradients in concentration, implying flow and mass transport. Moreover, phase transitions can occur, with either evaporation, solidification, dissolution, or nucleation of a new phase. The droplets and their surrounding liquid can be binary, ternary, or contain even more components, and with several even in different phases. In the last two decades the rapid advances in experimental and numerical fluid dynamical techniques has enabled major progress in our understanding of the physicochemical hydrodynamics of such droplets, further narrowing the gap from fluid dynamics to chemical engineering and colloid & interfacial science and arriving at a quantitative understanding of multicomponent and multiphase droplet systems far from equilibrium, and aiming towards a one-to-one comparison between experiments and theory or numerics. This review will discuss various examples of the physicochemical hydrodynamics of droplet systems far from equilibrium and our present understanding of them. These include immiscible droplets in a concentration gradient, coalescence of droplets of different liquids, droplets in concentration gradients emerging from chemical reactions (including droplets as microswimmers) and phase transitions such as evaporation, solidification, dissolution, or nucleation, and droplets in ternary liquids, including solvent exchange, nano-precipitation, and the so-called ouzo effect. We will also discuss the relevance of the physicochemical hydrodynamics of such droplet systems for many important applications, including in chemical analysis and diagnostics, microanalysis, pharmaceutics, synthetic chemistry and biology, chemical and environmental engineering, the oil and remediation industries, inkjet-printing, for micro-and nano-materials, and in nanotechnolgoy.

show abstract

Section: Introductionmentioning

confidence: 99%

Physicochemical hydrodynamics of droplets out of equilibrium

2020

View full text Add to dashboard Cite

show abstract

“…To simulate fluid evaporation, we use a diffusion dominated evaporation model, developed recently in our group. 18 The starting configuration of the system before evaporation is the same as those shown in e.g., Fig 5. Once a steady-state is reached, we start to evaporate the droplet. When an upward magnetic field is applied, the particles stay at the top during the evaporation of the droplet (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In order to simulate evaporation, we impose the density of component c at the boundary sites to be a constant value. 18 In addition, we apply Shan-Chen type potentials between solid walls and the fluid 37 in order to tune the wettability of the substrate.…”

Section: Methodsmentioning

confidence: 99%

Direct Assembly of Magnetic Janus Particles at a Droplet Interface

Xie

Davies²,

Harting

2017

ACS Nano

Self Cite

View full text Add to dashboard Cite

Self-assembly of nanoparticles at fluid-fluid interfaces is a promising route to fabricate functional materials from the bottom-up. However, directing and controlling particles into highly tunable and predictable structures, while essential, is a challenge. We present a liquid interface assisted approach to fabricate nanoparticle structures with tunable properties. To demonstrate its feasibility, we study magnetic Janus particles adsorbed at the interface of a spherical droplet placed on a substrate. With an external magnetic field turned on, a single particle moves to the location where its position vector relative to the droplet center is parallel to the direction of the applied field. Multiple magnetic Janus particles arrange into reconfigurable hexagonal lattice structures and can be directed to assemble at desirable locations on the droplet interface by simply varying the magnetic field direction. We develop an interface energy model to explain our observations, finding excellent agreement. Finally, we demonstrate that the external magnetic field allows one to tune the particle deposition pattern obtained when the droplet evaporates. Our results have implications for the fabrication of varied nanostructures on substrates for use in nanodevices, organic electronics, or advanced display, printing, and coating applications.

show abstract

“…A schematic of the model is shown in electronic supplementary material, figure S1. The evaporation model has been validated in our previous paper [25] by measuring the evolution of the interface height (h) during the evaporation. The numerical and analytical results showed a good quantitative agreement.…”

Section: Methodsmentioning

confidence: 99%

“…For more details on our implementation, we refer the reader to some of our previous publications [18,19,25,31–36].…”

Section: Methodsmentioning

confidence: 99%

Lattice Boltzmann simulations of drying suspensions of soft particles

Wouters

Aouane

Sega

et al. 2021

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

The ordering of particles in the drying process of a colloidal suspension is crucial in determining the properties of the resulting film. For example, microscopic inhomogeneities can lead to the formation of cracks and defects that can deteriorate the quality of the film considerably. This type of problem is inherently multiscale and here we study it numerically, using our recently developed method for the simulation of soft polymeric capsules in multicomponent fluids. We focus on the effect of the particle softness on the film microstructure during the drying phase and how it relates to the formation of defects. We quantify the order of the particles by measuring both the Voronoi entropy and the isotropic order parameter. Surprisingly, both observables exhibit a non-monotonic behaviour when the softness of the particles is increased. We further investigate the correlation between the interparticle interaction and the change in the microstructure during the evaporation phase. We observe that the rigid particles form chain-like structures that tend to scatter into small clusters when the particle softness is increased. This article is part of the theme issue ‘Progress in mesoscale methods for fluid dynamics simulation’.

show abstract

Diffusion dominated evaporation in multicomponent lattice Boltzmann simulations

Cited by 22 publications

References 35 publications

Physicochemical hydrodynamics of droplets out of equilibrium

Physicochemical hydrodynamics of droplets out of equilibrium

Direct Assembly of Magnetic Janus Particles at a Droplet Interface

Lattice Boltzmann simulations of drying suspensions of soft particles

Contact Info

Product

Resources

About