Rheology of steady-state draining foams |
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Authors: | Soller Raenell Koehler Stephan A |
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Institution: | Department of Physics, Emory University, Atlanta, Georgia 30322, USA. |
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Abstract: | We developed the foam drainage rheology technique in order to perform rheological measurements of aqueous foams at a set liquid fraction epsilon and fixed bubble radius R without the usual difficulties associated with fluid drainage and bubble coarsening. The shear stress exhibits a power-law dependence on strain-rate, tau approximately gammaover]n where n approximately 0.2. The stress exhibits an inverse dependence on liquid content, tau approximately (1+h'epsilon)(-1), where h'=theta(10) exhibits a diminishing logarithmic trend with gammaover]. We propose a model based upon film shearing as the dominant source of viscous dissipation. |
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