Model Caneau

Mobuchon, Ch., Caneau, P. J., and Heuzey, M.-C., Effect of flow history on the structure of a non-polar polymer/clay nanocomposite model system, Rheol. Acta, 46, 1045-1056... 

The above expression would be valid within the low to medium shear-rate range (i.e., 0 7 10 s ). Other expressions for i i could have been obtained by considering the other viscosity functions described in the earlier section. However, this has not been done because the effective upper limit of shear rate of not greater than 10 s for actual primary normal stress experimental measurements lies in a range consistent with only the Caneau model. In case measurements of primary normal stress at higher shear rates ever become possible in the future due to improved sophistication in experimental techniques, it is recommended that Eq. (2.44) from the General Rheological Model [87] be used... 

A Caneau-type model has also been applied to squeezing flow (eq. 2.4.16) (Phan Thien et al., 1987). 

No-slip boundary conditions on the screw surfaces and barrel walls were used. In order to compare the mixing abihty of the difieient mixing elements, we used the absolute same boundary conditions and material parameters in the simulation of the three flow fields. With the capillary rheometer, we measured the rheologic behavior of the molten compoimd which mixed by LDPE and nano Mg(OH)2(30% mass ratio), and we found its curve meets the Caneau model well. Boundary conditions and material parameters are shown in Table 1. 

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