Role of surfactant-induced Marangoni stresses in drop-interface coalescence

Constante-Amores, C. R.; Batchvarov, Assen; Kahouadji, Lyes; Shin, Seungwon; Chergui, Jalel; Jurić, Damir; Matar, Omar

doi:10.1017/jfm.2021.682

Cited by 22 publications

(21 citation statements)

References 67 publications

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“…Here, we once again observe that the damping increases and wave propagation decreases with increasing γ . We note that a similar damping effect on capillary waves has recently been observed for the coalescence of a surfactant-laden droplet coalescing with a liquid bath [54]. We thus conclude that γ has a strong effect on the capillary waves (and by extent, the protrusion) on droplet 2.…”

Section: Asymmetric Capillary Wavessupporting

confidence: 81%

Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves

et al. 2021

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When two droplets with different surface tensions collide, the shape evolution of the merging droplets is asymmetric. Using experimental and numerical techniques, we reveal that this asymmetry is caused by asymmetric capillary waves, which are the result of the different surface tensions of the droplets. We show that the asymmetry is enhanced by increasing the surface tension difference, and suppressed by increasing the inertia of the colliding droplets. Furthermore, we study capillary waves in the limit of no collisional inertia. We reveal that the asymmetry is not directly caused by Marangoni forces. In fact, somehow counterintuitive, asymmetry is strongly reduced by the Marangoni effect. Rather, the different intrinsic capillary wave amplitudes and velocities associated with the different surface tensions of the droplets lie at the origin of the asymmetry during droplet coalescence.

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Section: Asymmetric Capillary Wavessupporting

confidence: 81%

Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves

et al. 2021

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“…Similar findings were observed from numerical simulations (Antonopoulou, 2020;Constante-Amores et al, 2021;Cui and Gupta, 2012) where the presence of surfactants makes interfaces more rigid, slows down the neck growth and extends the necking stage. Similarly to the dripping regime, 𝑚 for TX100 does not reach a plateau as in the DTAB and SDS cases due to the differences in surfactant kinetics as explained in previous work (Kalli et al, 2022).…”

Section: Drop Formation Time In the Dripping Regimesupporting

confidence: 84%

Effect of surfactants on drop formation flow patterns in a flow-focusing microchannel

Kalli

Angeli

2022

Chemical Engineering Science

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“…Extensive mesh studies for surface-tension-driven phenomena with the same numerical methodology have been presented in Constante-Amores et al. (2020,2021 c , a ). At the early stages of the simulation, capillary action drives the formation of a smooth cylindrical rim at the free end of the liquid sheet.…”

Section: Problem Formulation and Numerical Methodsmentioning

confidence: 99%

Role of surfactant-induced Marangoni stresses in retracting liquid sheets

et al. 2022

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In this work, we study the effect of insoluble surfactants on the three-dimensional rim-driven retraction dynamics of thin water sheets in air. We employ an interface-tracking/level-set method to ensure the full coupling between the surfactant-induced Marangoni stresses, interfacial diffusion and inertia. Our findings are contrasted with the (Newtonian) dynamics of a liquid sheet edge, finding that the surfactant concentration can delay, or effectively prevent, the breakup of the rim. Our simulations use the fastest growing Rayleigh–Plateau instability to drive droplet detachment from the fluid sheet (rim). The results of this work unravel the significant role of Marangoni stresses in the retracting sheet dynamics at large elasticity numbers. We study the sensitivity of the dynamics to the elasticity number and the rigidification of the interface.

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Role of surfactant-induced Marangoni stresses in drop-interface coalescence

Abstract: Abstract

Cited by 22 publications

References 67 publications

Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves

Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves

Effect of surfactants on drop formation flow patterns in a flow-focusing microchannel

Role of surfactant-induced Marangoni stresses in retracting liquid sheets

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