منابع مشابه
High Shear Rate Viscometry
We investigate the use of two distinct and complementary approaches to measuring the viscometric properties of low viscosity complex fluids at high shear rates up to 80,000 s−1. Firstly we adapt commercial controlled-stress and controlled-rate rheometers to access elevated shear rates by using parallel plate fixtures with very small gap settings (down to 30 μm). The resulting apparent viscositi...
متن کاملStress Overshoot of Polymer Solutions at High Rates of Shear
Overshoot of shear stress, s, and the first normal stress difference, N1, in shear flow were investigated for polystyrene solutions. The magnitudes of shear corresponding to these stresses, gsm and gNm, for entangled as well as nonentangled solutions were universal functions of ġteq, respectively, and gNm was approximately equal to 2gsm at any rate of shear, ġ. Here teq 5 tR for nonentangled sy...
متن کاملShear Orientation of Viscoelastic Polymer-clay Solutions
Shear-induced structural changes in complex fluids of anisotropic species are very general phenomena, occurring in polymer solutions, liquid crystalline materials and block copolymer melts. The purpose of our work is to investigate the influence of shear on the structure of a highly viscoelastic, aqueous clay-polymer solution. Many structural models have been proposed for such solutions [1-3], ...
متن کاملApproximate Solutions for the Couette Viscometry Equation
The recovery of flow curves for non-Newtonian fluids from Couette rheometry measurements involves the solution of a quite simple first kind Volterra integral equation with a discontinuous kernel for which the solution, as a summation of an infinite series, has been known since 1953. Various methods, including an Euler–Maclaurin sum formula, have been proposed for the estimation of the value of ...
متن کاملAutomated Batch Characterization of Polymer Solutions by Static Light Scattering and Viscometry
Using a programmable mixing pump, light scattering flow chamber, refractive index detector, and single capillary viscometer, the batch (unfractionated) characterization of polymers in solution has been automated. Three different schemes to produce polymer concentration gradients were used, and values for weight average mass Mw, root mean square radius of gyration ^S & , second virial coefficien...
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ژورنال
عنوان ژورنال: Journal of Polymer Science: Polymer Physics Edition
سال: 1981
ISSN: 0098-1273,1542-9385
DOI: 10.1002/pol.1981.180190717