Instability of the one-dimensional thickness profile at the edge of a horizontal foam film and its Plateau border

Trégouët, Corentin; Cantat, Isabelle

doi:10.1103/physrevfluids.6.114005

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…In the experiments, marginal regeneration started almost instantly after film formation, whilst the breaking of axisymmetry occurred later after around 20 s in the simulations. The mechanism that leads to pinch destabilisation and marginal regeneration, which is yet to be fully understood (Trégouët & Cantat 2021), is not incorporated into the model since the pinch lies outside of the simulated region; therefore, it may be more realistic to trigger marginal regeneration in the simulations by perturbing the film thickness or surface surfactant concentration. As evident from figures 5 and 10( a – c ), the frequency of thin patches was much larger in the experiments compared with the simulations, suggesting that marginal regeneration contributed more significantly to the rate of thinning in the experiments.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…Liquid is sucked from the thin film into the meniscus by capillary suction, which arises since the meniscus is at a lower pressure than the thin film due to its curvature (Overbeek 1960). The flow of liquid into the meniscus causes a region of reduced film thickness, known as a marginal pinch, to form in the transition region (Trégouët & Cantat 2021). Gradients in surface tension can destabilise the marginal pinch (Miguet et al 2021a), resulting in marginal regeneration, an important drainage mechanism for partially mobile soap films (Mysels 1968;Miguet, Rouyer & Rio 2021b).…”

Section: Introductionmentioning

confidence: 99%

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Thin film modelling of magnetic soap films

Lalli,

Giusti

2024

J. Fluid Mech.

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Magnetic soap films under the forcing of an inhomogeneous magnetic field are governed by a wide range of interconnected physics. The study of magnetic soap films requires the development of comprehensive models to support experimental observations. In this study, the thin film approximation is applied to the Navier–Stokes equations to derive a model for the film thickness of magnetic soap films that incorporates the effects of interfacial mobility, surfactant transport and magnetite nanoparticle (NP) transport. This derived model consists of a coupled system of equations for the film thickness, interfacial velocity, interfacial surfactant concentration and magnetite NP concentration. Simulations are performed for both soap films and magnetic soap films by solving the system of equations using the Galerkin finite element method, and results are compared with experiments. Simulation results highlight that interfacial flows can dominate the rate of film thinning and that accounting for the dependence of the magnetisation on the local magnetite NP concentration can influence the predicted speed of magnetically driven flows. Furthermore, simulation results demonstrate that the model is able to predict marginal regeneration in qualitative agreement with the experiments for soap films; the model also predicts the same flow pattern as seen in the experiments for magnetic soap films. Overall, this study advances the state of soap film and magnetic soap film modelling and will contribute to acquiring control over the drainage and stability of magnetic soap films in the long term.

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Section: Comparison With Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thin film modelling of magnetic soap films

Lalli,

Giusti

2024

J. Fluid Mech.

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“…Bridging actually causes an unbalanced tension in the film that drives its stretching with a fast plug flow. Tensions balance, which is necessary for the development of a slower Poiseuille flow, as described in thin films with surface elasticity, 13,21,25 cannot be established. As a consequence, we expect that bridging cannot give way to the formation of any dimple, which is associated with a velocity gradient across the film thickness.…”

Section: Mechanisms Of Film Bursting In Oil Foamsmentioning

confidence: 99%

How emulsified droplets induce the bursting of suspended films of liquid mixtures

Delance,

Santanach-Carreras,

Passade-Boupat

et al. 2024

Soft Matter

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The stability of magnetic soap films

et al. 2023

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Although previous studies have shown that a magnetic field can drastically alter drainage in soap films containing particles responsive to a magnetic field, which we refer to as magnetic soap films, it is yet to be understood whether a magnetic field may be able to control the rate of drainage and film stability. Furthermore, the effect of a magnetic field on key drainage mechanisms, such as marginal regeneration, is unknown. An experimental investigation involving interferometry is conducted here to develop further understanding of the behavior of horizontal soap films containing magnetite nanoparticles. Three scenarios are considered: soap films, magnetic soap films, and magnetic soap films in an inhomogeneous magnetic field. In each of the three scenarios, high-resolution images capturing the time evolution of each film are acquired, and the lifetime of each film is measured. In addition, a measure of the rate of drainage and the velocities of thin patches of fluid arising from marginal regeneration are evaluated. The results suggest that a magnetic field may be able to have either a stabilizing or destabilizing effect on magnetic soap films, depending on their composition. Furthermore, applying a magnetic field to magnetic soap films alters the trajectory of thin patches of fluid arising from marginal regeneration. This study reveals how a magnetic field can be used in conjunction with magnetic particles to control the stability of soap films, which opens up the possibility for new technologies that require a fine control of film stability.

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Instability of the one-dimensional thickness profile at the edge of a horizontal foam film and its Plateau border

Cited by 6 publications

References 27 publications

Thin film modelling of magnetic soap films

Thin film modelling of magnetic soap films

How emulsified droplets induce the bursting of suspended films of liquid mixtures

The stability of magnetic soap films

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