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Roughness-induced friction in liquid foams

Abstract : Complex liquids flow is known to be drastically affected by the roughness condition at the interfaces. We combined stresses measurements and observations of the flow during the motion of different rough surfaces in dry liquid foams. We visually show that three distinct friction regimes exists: slippage, stick-slip motion, and anchored soap films. Our stress measurements are validated for slippage and anchored regimes based on existing models, and we propose a leverage rule to describe the stresses during the stick-slip regime. We find that the occurrence of the stick-slip or anchored regimes is controlled by the roughness factor, defined as the ratio between the size of the surface asperities and the radius of curvature of the Plateau borders.
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https://hal.archives-ouvertes.fr/hal-02472277
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Submitted on : Monday, February 10, 2020 - 10:15:50 AM
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Manon Marchand, Frederic Restagno, Emmanuelle Rio, François Boulogne. Roughness-induced friction in liquid foams. Physical Review Letters, American Physical Society, In press. ⟨hal-02472277⟩

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