ΔPtot ¼ ΔPe þ ΔP ¼ ΔPe þ ðΔP=LÞ L: ð1Þ
The viscosity measurement of a non-Newtonian fluid, as in the studied
case, is obtainable by the following relationship [18]:
η ¼ τw=γ
w
¼ τw= CWR γ
aw
: ð2Þ
where η is the viscosity, τw, γ
w and γ
aw are the shear stress, the shear
rate and the apparent shear rate measured on the wall, and CWR is the