Spreading and retraction dynamics of sessile evaporating droplets comprising volatile binary mixtures

Williams, Adam; Karapetsas, George; Mamalis, Dimitrios; Sefiane, Khellil; Matar, Omar; Valluri, Prashant

doi:10.1017/jfm.2020.840

Cited by 23 publications

(26 citation statements)

References 82 publications

(182 reference statements)

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“…In recent years, the latter approach has been further developed to simulate the spreading and evaporation phenomena of more complex droplets, such as those with nanoparticles (Matar, Craster & Sefiane 2007;Craster, Matar & Sefiane 2009), with colloidal suspensions (Maki & Kumar 2011), as well as in the study of particle deposition in the presence of surfactants (Karapetsas, Sahu & Matar 2016), and the evaporation of droplets consisting of binary mixtures (e.g. ethanol-water) (Williams et al 2021). Besides the development of lubrication-type models for droplets with complex components, researchers have also developed models to simulate the observed interfacial phenomena and the droplet motion under external forces (Espín & Kumar 2014).…”

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%

“…ethanol–water) (Williams et al . 2021). Besides the development of lubrication-type models for droplets with complex components, researchers have also developed models to simulate the observed interfacial phenomena and the droplet motion under external forces (Espín & Kumar 2014).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

et al. 2021

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“…The first qualitative observations of the thermal Marangoni flow in evaporating water droplets were made by Deegan et al [10,11], and soon after quantitatively modeled by Hu and Larson [20]. Solutal Marangoni flows in this context have also been studied extensively, either to study their role in the spreading and retraction of multi-component droplets [18,40], or their role in the droplet's shape [18,22,38], or their competition with gravitational forces [12], or their role in particle deposition when driven by surfactants (or antisurfactants) [7,28,29,33,34,37].…”

Section: Introductionmentioning

confidence: 99%

Influence of Added Dye on Marangoni-driven Droplet Instability

Seyfert¹,

Marin²

2021

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Multiphase flows are challenging systems to study, not only from a fundamental point of view, but also from a practical one due to the difficulties in visualizing phases with similar refraction indices. An additional challenge arises when the multiphase flow to be observed occurs in the sub-millimetric range. A common solution in experimental fluid dynamics is the addition of a color dye for contrast enhancement. However, added dyes can act as surface-active agents and significantly influence the observed phenomena. In the recently reported Marangoni bursting phenomenon, where a binary droplet on top of an oil bath is atomized in thousands of smaller droplets by Marangoni stresses, visualization is particularly challenging and the use of color dyes is naturally tempting. In this work, we quantify experimentally the significant influence of added methyl blue dye, as well as the obtained contrast enhancement. We find that the reaction of the system to such an additive is far from trivial and brings an opportunity to learn about such a complex phenomenon. Additionally, we propose a simple method to analyze the contrast enhancement as a function of dye concentration, with the aim of finding the minimum concentration of dye for successful imaging in similar systems.

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“…Karpitschka et al [31] studied the phenomena for 1,2-butanediole/water and found that the apparent contact angle θ app decreases with the increase of the relative humidity RH, satisfying the relation θ app ∼ (RH eq − RH) 1/3 , and developed a scaling argument to explain the relation. Williams et al [32] conducted more detailed analysis taking into account of the thermal Marangoni effect.…”

Section: Introductionmentioning

confidence: 99%

Contact Angle of an Evaporating Droplet of Binary Solution on a Super Wetting Surface

Wu,

Doi,

Man

2021

Preprint

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We study the dynamics of contact angle of a droplet of binary solution evaporating on a super wetting surface. Recent experiments show that although equilibrium contact angle of such droplet is zero, the contract angle can show complex time dependence before reaching the equilibrium value.We analyse such phenomena by extending our previous theory for the dynamics of an evaporating single component droplet to double component droplet. We show that the time dependence of the contact angle can be quite complex. Typically, it first decreases slightly, and then increases and finally decreases again. Under certain conditions, we find that the contact angle remains constant over a certain period of time during evaporation. We study how the plateau or peak contact angle depends on the initial composition and the humidity. The theory explains experimental results reported previously.

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Spreading and retraction dynamics of sessile evaporating droplets comprising volatile binary mixtures

Abstract: Abstract

Cited by 23 publications

References 82 publications

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

Dynamics of hygroscopic aqueous solution droplets undergoing evaporation or vapour absorption

Influence of Added Dye on Marangoni-driven Droplet Instability

Contact Angle of an Evaporating Droplet of Binary Solution on a Super Wetting Surface

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