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- W19199148 abstract "A new kind of shear-elongational rheometer capable of measuring the shear properties of polymeric solutions in a viscometric flow situation through a concentric cylindrical device and relating the results to simultaneous measurements on elongational flow has been described earlier by Gama and coworkers [1992]. The viscometric flow between concentric cylinders provides torque and first normal stress difference measurements, and imposes a viscometric pre-shearing history on the fluid. A suction device applied through an orifice at the bottom of the gap between the concentric cylinders provides a uniaxial extensional flow. The average tensile stress is measured through flush mounted pressure transducers in the Couette device, and the change in the filament diameter in the extensional flow region between the orifices provides a measurement of the instantaneous rate of elongation. The influence of the pre-shearing history upon the elongational properties is measured directly by transducers and computed using the average value of the tensile stress growth coefficient. Measurements are presented for a constant shear viscosity, elastic fluid of the Boger type. Next, by considering a simple, single integral model, it is shown that the tensile stress growth coefficient is affected by pre-shearing, and is higher than without any pre-shearing. This theoretical result, obtained also for a KBKZ model [1], demonstrates that the increase depends on the extensional flow rate, the shear rate, the relaxation time and the first normal stress difference." @default.
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- W19199148 date "2002-11-01" @default.
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- W19199148 title "Some theoretical and experimental relations between simple shearing and simple extension" @default.
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