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T from Equation 1.22:
T= 105013.6 Pa
K from Equation 1.26:
Die constant Gcirde from Equation 5.3:
Ap0 with Q = 8.194 • 10 5 m 3 /s from Equation 5.2:
b) Adiabatic flow
The relationship for the ratio —— is [17]
where
Ap0
Temperature rise from Equation 5.18:
For polystyrene
Finally, Ap from Equation 5.74:
(5.74)
(5.75)
In the adiabatic case, the pressure drop is smaller because the dissipated heat is retained
in the melt.