HANSER Hanser Publishers, Munich • Hanser Gardner Publications ...
HANSER Hanser Publishers, Munich • Hanser Gardner Publications ...
HANSER Hanser Publishers, Munich • Hanser Gardner Publications ...
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Example 4<br />
Melt flow through an annulus with an outside radius R0 = 40 mm, an inside radius<br />
R1 = 39 mm, and of length L = 100 mm.<br />
The resin is LDPE with the same viscosity constants as in Example 1. The process<br />
parameters, mass flow rate, and melt temperature remain the same.<br />
Solution<br />
Volume flow rate<br />
Shear rate y^ from Equation 5.11:<br />
Shift factor aT from Equation 1.34:<br />
Power law exponent n from Equation 1.37:<br />
n = 2.907<br />
Viscosity 7]a from Equation 1.36:<br />
?7a = 579.43 Pa <strong>•</strong> s<br />
Shear stress T from Equation 1.22:<br />
T= 200173.6 N/m 2<br />
Factor of proportionality K from Equation 1.26:<br />
K= 1.3410 -10" 13<br />
Correction factor Fp<br />
As the ratio — = 248.19 is greater than 37, no correction is necessary.<br />
G annuius from Equation 5.8: