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Calculating Oscillating Viscosity

Hi

I am trying to model the oscillating viscosity of cornstarch (non newtonian liquid).

Is this a correct model?
$\eta=k[\dot\gamma(t)]^{n-1} e^{T_0/T}$

and...
$\dot\gamma(t)=\gamma_0 \omega \cos (\omega t)$

Where $\gamma_0$ is the shear amplitude.

IF this model is correct..
How do I apply it to cornstarch?

How do I calculate the shear amplitude
How do I calculate k
What is the value of n for cornstarch

Please Reply
Regards