Abstract
The analysis for the liquid—gas deep-channel surface viscometer has been extended to the liquid—liquid—gas case with two interfaces for a class of interfacial behaviors that describes the surface stress as a function of the surface rate of deformation. The analysis takes into account the viscous effects in all three phases. By measuring the gas—liquid surface velocity distribution, the liquid—liquid interfacial behavior can be determined, if the shear stress distribution at the gas—liquid interface has been previously determined. Experimental results for a Petrostep Sulfonate solution-decane-air system are presented.
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