Abstract
An improved surface rheological technique, based on the viscous-traction concept, is described. In the proposed geometry, an annular canal is formed by two concentric cylinders. A moving floor supplied the motive force for flow without a pressure gradient, and provisions are made for maintaining an almost perfectly flat gas/liquid interface. Equations are derived for the flow of two immiscible fluids separated by an interface that may possess the properties of Newtonian surface viscosity or rigidity. Measurements with different solvents were used to verify the basic hydrodynamical assumptions, and very close agreement (98.7% ± 0.4%) was obtained between the measured and calculated surface flow of uncontaminated liquids. The residual error of approximately 1% has been accounted for by the small gap between the canal walls and the floor. These results justify the technique of making surface rheological measurements of a solution relative to the pure solvent; however due consideration must be given to the basic assumptions of the analysis in order to avoid anomalous results.
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