Rayleigh–Taylor instability by segregation in an evaporating multicomponent microdroplet

Li, Yaxing; Diddens, Christian; Segers, Tim; Wijshoff, Herman; Versluis, Michel; Lohse, Detlef

doi:10.1017/jfm.2020.449

Cited by 21 publications

(27 citation statements)

References 55 publications

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“…In recent years, studies on multicomponent droplets have revealed attractive physical phenomena (Lohse & Zhang 2020) induced by the preferential evaporation of individual components or mediated by external vapour sources, e.g. the occurrence of density-driven flows (Edwards et al 2018;Li et al 2019), phase segregation/separation (Li et al 2018;Li et al 2020;Mao et al 2020), the transient Marangoni flow and solutal effects (Christy, Hamamoto & Sefiane 2011), etc. Specifically, in an evaporating multicomponent droplet, the spatiotemporal variation of interfacial mass flux induces the gradients of liquid density, temperature and concentration.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

et al. 2021

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Section: Introductionmentioning

confidence: 99%

“…2018; Li et al. 2020; Mao et al. 2020), the transient Marangoni flow and solutal effects (Christy, Hamamoto & Sefiane 2011), etc.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

et al. 2021

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“…To visualize the local details within the segregative patterns, the binary mixture was labelled with two different dyes, Dextran and Nile Red (Li et al 2018). Dextran dissolves preferentially in water, and it was excited by a laser at wavelength 488 nm, while Nile Red is a lipophilic dye that dissolves only in 1,2-hexanediol and was excited by a laser at wavelength 561 nm simultaneously.…”

Section: Fluorescence Image Acquisitionmentioning

confidence: 99%

“…In (partially) volatile multicomponent droplets, in general, phase segregation emerges, as such systems are out of equilibrium. This is due to evaporation (Tan et al 2016;Li et al 2018;Karpitschka 2018;Kim & Stone 2018;Sadafi et al 2020) or dissolution (Dietrich et al 2017), or crystallization (Mailleur et al 2018;Li et al 2020b). Commonly, the emerging segregative patterns lead to a non-volatile shielding or an entrapment, where one liquid on the surface of the droplets covers the others, hindering its further evaporation.…”

Section: Introductionmentioning

confidence: 99%

Physiochemical hydrodynamics of the phase segregation in an evaporating binary microdroplet

Diddens

et al. 2022

J. Fluid Mech.

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Phase segregation triggered by selective evaporation can emerge in multicomponent systems, leading to complex physiochemical hydrodynamics. Recently, Li et al. (Phys. Rev. Lett., vol. 120, 2018, 224501) and Kim & Stone (J. Fluid Mech., vol. 850, 2018, pp. 769–783) reported a segregative behaviour (i.e. demixing) in an evaporating binary droplet. In this work, by means of experiments and theoretical analysis, we investigate the flow dynamics after the occurrence of the phase segregation. As example, we take the 1,2-hexanediol–water binary droplet system. First, we reveal experimentally the overall physiochemical hydrodynamics of the evaporation process, including the segregative behaviour and the resulting flow structure close to the substrate. By quantifying the evolution of the radial flow, we identify three successive life stages of the evaporation process. At Stage I, a radially outward flow is observed, driven by the Marangoni effect. At the transition to Stage II, the radial flow reverses partially, starting from the contact line. This flow breaks the axial symmetry and remarkably is driven by the segregation itself. Finally at Stage III, the flow decays as the evaporation ceases gradually. At this stage, the segregation has grown to the entire droplet, and the flow is again controlled by the Marangoni effect. The resulting Marangoni flow homogenizes the distribution of the entrapped volatile water over the whole droplet.

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“…The full phase diagram in the Ra vs M a parameter space is displayed in figure 4d, featuring either pure Rayleigh convection rolls, or pure Marangoni convection rolls, or both at the same time. Also for large Rayleigh numbers the axisymmetry can be broken, and a Rayleigh-Taylor instability can emerge [137].…”

Section: Droplets In Concentration Gradients Emerging From Phase Tran...mentioning

confidence: 99%

Physicochemical Hydrodynamics of Droplets out of Equilibrium: A Perspective Review

Lohse

Zhang

2020

Preprint

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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.

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Rayleigh–Taylor instability by segregation in an evaporating multicomponent microdroplet

Abstract: Abstract

Cited by 21 publications

References 55 publications

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

Physiochemical hydrodynamics of the phase segregation in an evaporating binary microdroplet

Physicochemical Hydrodynamics of Droplets out of Equilibrium: A Perspective Review

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