Is it possible to have a negative flow behaviour index in the power law non-Newtonian model (n<0 in mu = K*gamma^(n-1))?

I have some flow curves of a non-Newtonian shear-thinning polymer measured on a rheometer. Upon fitting it with the power law model (mu = K*gamma^(n-1)), the value of n I get is less than zero. Is...

12 January 2023 543 0 View