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We report on the Rayleigh-Plateau instability in films of giant micellessolutions coating a vertical fibre. We observe that the dynamics of thin filmscoating the fibre could be very different from the Newtonian or standardNon-Newtonian cases. By varying the concentration of the components of thesolutions and depending on the film thickness, we show for the first time thatthe Rayleigh-Plateau instability can be stabilized using surfactant solutions.Using global rheology and optical visualisations, we show that the developmentof shear-induced structures is required to stabilize the micellar film alongthe fibre. Assuming that the viscoelastic properties of the shear-induced statecan be described by a simple model, we suggest that, in addition to thepresence of shear-induced structures, the latter must have an elastic modulusgreater than a critical value evaluated from a linear stability analysis.Finally, our analysis provides a way of estimating the bulk elasticity of theshear-induced state.

Suppression of the Rayleigh-Plateau instability on a vertical fibre coated with wormlike micelle solutions