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Y gamma = 0 for sigma = Y . ( 1 2 . 4 ) . ( 1 2 . 4 ) Problem

Y\gamma =0 for \sigma = Y
.
(12.4)
.
(12.4)Problem 12.1
A CaCO3-filled PP melt is found to obey the relationship given by Eq.(12.4), in
whichY is 2.5\times 104 Pa, K is 4.5\times 104 Pa s0.5, and n =0.5 at 200C.(a) Sketch the
viscosity versus shear rate curve. (b) Sketch velocity and shear stress distributions
in a long cylindrical tube through which this material is extruded. (c) What will the
pressure drop be when this material is extruded in a long flat film die (60 cm wide,
0.2 cm thick, and 10 cm long) at a volumetric flow rate of 100 cm3/s at 200C?

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