Foam drainage varies with surfactant. We present direct measurements of the flow velocity profiles across single Plateau borders, which make up the interconnected channel-like network for liquid flow. For protein foams the interface is rigid, whereas small-surfactant foams show significant interfacial mobility. The results agree with a model that takes into account the shearing of the liquid-gas interface transverse to the flow direction. A significant consequence is that bubble size and liquid volume fraction in a foam affect the relative importance of surface rheology on the drainage behavior.
|Number of pages||4|
|Journal||Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics|
|Publication status||Published - 2002|
Koehler, S. A., Hilgenfeldt, S., Weeks, E. R., & Stone, H. A. (2002). Drainage of single Plateau borders: Direct observation of rigid and mobile interfaces. Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics, 66(4), [040601(R)]. https://doi.org/10.1103/PhysRevE.66.040601