Food Rheology & Non-Newtonian Flow

According to the Ostwald-de Waele power law model $\tau = K \dot{\gamma}^n$, a pseudoplastic (shear-thinning) food fluid such as fruit puree or tomato ketchup has a flow behavior index of:

Options:

• (A) $n < 1$
• (B) $n = 1$
• (C) $n > 1$
• (D) $n = 0$