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6. (a) Show that the Cross-Arrhenius (5-constant) viscosity model equation can be reduced to a Power-law model like $η(T,γ˙ )=m(T)γ˙ _{n−1}$ at very high shear rates and at $T>T_{trans.}$. (3 points) $η(T,γ˙ ,p)=1+[τη(T,p)γ˙ ]_{(1−n)}η_{0}(T,p) T>T_{trans},η_{0}(T,p)=B×exp(TT_{b} )×exp(β×p)T<T_{trans},η_{0}(T,p)=∞ $ $η_{0}$ is the zero-shear-rate viscosity $γ˙ $ is the shear rate $T$ is the temperature $p$ is the pressure $n,τ_{∗},B,T_{b}$, and $β$ are model constants

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