non-Newtonian viscosity

non-Newtonian viscosity

[‚nän·nü′tō·nē·ən vi′skäs·əd·ē]
(fluid mechanics)
The behavior of a fluid which, when subjected to a constant rate of shear, develops a stress which is not proportional to the shear. Also known as anomalous viscosity.
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D] second invariant of the rate of strain tensor p Pressure [mu] Newtonian viscosity [eta] non-Newtonian viscosity n power-law index T Temperature b temperature sensitivity coefficient of viscosity m consistency index R calender radius [x.
In the laboratory experimental measurements, the density and non-Newtonian viscosity behavior of drilling mud are evaluated.
In this section, the model of the non-Newtonian viscosity was introduced first, and the formulation for the plastic melt flow was then derived for optimization.
where [eta]([absolute value of [gamma]]) is the apparent non-Newtonian viscosity given by the power-law model, which is a function of the magnitude [absolute value of [gamma]] of the rate-of-strain tensor [bar.
gamma]] Shear rate [eta] Non-Newtonian viscosity [rho] Density [tau] Stress tensor Table 1.
Figure 5 shows that with increased chain branching or raised molecular weight or polydispersity, the onset of non-Newtonian viscosity occurs at lower shear rates and at lower frequencies.
The effects of a non-Newtonian viscosity of a polymer on the amount of die swell can be much larger than the Newtonian examples presented here.
Eyring's model considers that the mechanisms of deformation are progressively activated according to a statistic of the clearing over energy barriers, An activated non-Newtonian viscosity is thus defined.
the non-Newtonian viscosity as a function of [DELTA]P, N, s, and position, is obtained when Eqs 19 and 17 as well as the relationships U = [pi] D N and Z = [kappa] [pi] D are plugged into the power-law model: [eta] = m[[gamma].
Figures 1A-C demonstrate that Eq 3 with the rheological parameters shown in Table 1 reproduce well the simple shear experimental data for non-Newtonian viscosity for all three polymer melts.
The effects of non-Newtonian viscosity may be significant.
However, in a non-Newtonian viscosity range E should be determined at constant shear stress (8).

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