Flowing superfluid films

Evidence for Thermally Activated Dissipation in Flowing Superfluid 3He

We report on observations of the onset of dissipation in superfluid 3He flowing through a single cylindrical channel of diameter d = O. 71xm and length L = 6.0 #m. We propose a model in which thermally activated phase slips in the order parameter can account for the observed onset of dissipation.

Marangoni elasticity of flowing soap films

We measure the Marangoni elasticity of a flowing soap film to be 22 dyne/cm irrespective of its width, thickness, flow speed, or the bulk soap concentration. We perform this measurement by generating an oblique shock in the soap film and measuring the shock angle, flow speed and thickness. We postulate that the elasticity is constant because the film surface is crowded with soap molecules. Our ...

Onset of spatially chaotic waves on flowing films.

Thin films flowing down inverted substrates: Two dimensional flow

We consider free surface instabilities of films flowing on inverted substrates within the framework of lubrication approximation. We allow for the presence of fronts and related contact lines and explore the role which they play in instability development. It is found that a contact line, modeled by a commonly used precursor film model, leads to free surface instabilities without any additional...

Thin films flowing down inverted substrates: Three-dimensional flow

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