Absence of scaling transitions in breakup of liquid jets caused by surface viscosity

Wee, Hansol; Wagoner, Brayden W.; Basaran, Osman A.

doi:10.1103/physrevfluids.7.074001

Cited by 7 publications

(16 citation statements)

References 29 publications

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“…As a result, surfactant-laden jets behave in a similar way to surfactant-free jets prior to pinch-off and exhibit the same similarity (Eggers 1993;Craster et al 2002;Timmermans & Lister 2002;Liao et al 2006;McGough & Basaran 2006;Eggers & Villermaux 2008). Remarkably, the surface viscous stresses can still play a role when most of surfactant molecules are swept away from the pinching point, because the surface-to-volume ratio at the pinching point becomes extremely large as the minimum radius of the jet tends to zero (Montanero & Gañán-Calvo 2020;Wee et al 2020Wee et al , 2021. However, surfactant molecules are not always evacuated from the pinching region, even for large surface Péclet numbers of the order of 10 5 , as detected by Ponce-Torres et al (2020).…”

Section: Introductionmentioning

confidence: 99%

“…There have been many reports in the literature devoted to understanding the effects of insoluble or soluble surfactants on the linear and nonlinear dynamics of films, drops, bubbles, jets, threads and other similar configurations, e.g. Liao, Franses & Basaran (2006), Hameed et al (2008), Craster et al (2009), Young et al (2009), Ponce-Torres et al (2016), Martínez-Calvo & Sevilla (2018), Hu, Fu & Yang (2020), He & Wylie (2021) and Wee et al (2021). The mechanism in one geometric configuration may be extrapolated to another.…”

Section: Introductionmentioning

confidence: 99%

“…The nonlinear dynamics of Newtonian jets and threads in the presence of surfactants has been studied via the asymptotic methods and numerical simulations, e.g. Anshus (1973), Craster et al (2002), Timmermans & Lister (2002), Dravid et al (2006), McGough & Basaran (2006), Craster et al (2009), Hameed & Maldarelli (2016), Martínez-Calvo et al (2020) and Wee et al (2021). It was found that the pinch-off of Newtonian liquid threads can be delayed by surfactants (Anshus 1973;Craster et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The one-dimensional (1-D) nonlinear analysis of surfactant-laden viscous threads in the Stokes limit showed that there exists a critical value of the surface Péclet number. Below this critical value, surface diffusion is dominant and the thread thins exponentially in time; above it, surface convection is dominant and the thinning of the thread exhibits a power-law dependence on time until pinch-off (Wee et al 2022). In the Stokes limit, the surface viscous stresses enter the dominant force balance and tend to slow down the thinning of Newtonian threads (Ozan & Jakobsen 2019;Wee et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of a surfactant-laden viscoelastic thread in the presence of surface viscosity

Fang¹,

He²

2023

J. Fluid Mech.

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As is known, the presence of surfactants can profoundly influence the dynamics of Newtonian viscous threads. Also, it is known that non-Newtonian viscoelastic threads behave differently from Newtonian ones, particularly in the nonlinear regime. A naturally arising question is how surfactants affect the dynamic behaviour of non-Newtonian viscoelastic threads. To gain some insights into it, we build a one-dimensional model for an Oldroyd-B/finitely extensible nonlinear elastic-Peterlin approximation (FENE-P) viscoelastic liquid thread covered with an insoluble surfactant monolayer based on the slender body theory. A parametric study is performed to examine the effects of the dimensionless numbers related to the surfactant, including the initial concentration, the Marangoni number, the surface Péclet number, the shear Boussinesq number and the dilatational Boussinesq number. It is found that the formation of the beads-on-a-string structure can be greatly delayed by the surfactant. At large values of the surface Péclet number, the exponential thinning of the Oldroyd-B viscoelastic thread is little influenced, but the surfactant may lead to the disappearance of secondary droplets. At moderate values of the surface Péclet number, the surfactant induces the formation of secondary droplets. The primary droplets are axially stretched by the Marangoni or surface viscous stresses and evolve into a prolate or a more singular shape eventually. The surfactant can delay the pinch-off of the FENE-P viscoelastic thread to a great extent, but it affects little the decrease in the minimum thread radius prior to pinch-off when the surface Péclet number is large.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of a surfactant-laden viscoelastic thread in the presence of surface viscosity

Fang¹,

He²

2023

J. Fluid Mech.

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“…Surface viscosities have also been found to alter the stability of viscous fingering 43 as well as play a role in pinch-off dynamics. 44–46…”

Section: Introductionmentioning

confidence: 99%

Influence of surface viscosities on the electrodeformation of a prolate viscous drop

Nganguia¹,

Das²,

Pak³

et al. 2023

Soft Matter

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Stability and thinning of liquid jets in the presence of soluble surfactants

Li,

Manikantan

2024

The Journal of Chemical Physics

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The dynamics of many multiphase fluid systems involve the thinning and eventual break up of a slender fluid filament or a liquid jet. The interfacial instability that controls the rate of jet thinning depends on the relative magnitudes of capillary, viscous, and inertial stresses. Surfactants add an additional layer of physicochemical dynamics by reducing the surface tension of the interface and introducing reverse Marangoni flows in response to surface concentration gradients. Surfactants may also introduce an intrinsic surface rheology that affects jet thinning. Quantifying these effects has been a significant problem in chemical physics and a topic of key research interest. Recent studies have shown that insoluble surfactants delay thread thinning and suppress instabilities in Newtonian jets. However, the role of surfactant solubility in liquid jet stability is still unknown. In this work, we use linear stability analysis to quantitatively show the stabilizing effects of Marangoni stresses, surfactant adsorption and desorption time, and intermolecular forces upon adsorption. We highlight the seemingly indistinguishable way in which various surfactant properties result in the same outcome. We also identify a surface dissipative contribution that arises from the interplay of Marangoni flows with finite adsorption and desorption, which acts as an “apparent” surface viscosity. We verify predictions of our linear stability results against numerical simulations and conclude by noting that tuning surface activity and kinetics of adsorbed surfactants or particles can potentially suppress droplet formation, which is of significant impact in the printing industry and in the control of the spread of aerosols.

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Absence of scaling transitions in breakup of liquid jets caused by surface viscosity

Cited by 7 publications

References 29 publications

Dynamics of a surfactant-laden viscoelastic thread in the presence of surface viscosity

Dynamics of a surfactant-laden viscoelastic thread in the presence of surface viscosity

Influence of surface viscosities on the electrodeformation of a prolate viscous drop

Stability and thinning of liquid jets in the presence of soluble surfactants

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