Answer:
The correct answer is B, indicating a dilatant fluid.
Step-by-step explanation:
(A) - Newtonian fluid:
A Newtonian fluid exhibits a linear relationship between the local strain rate (deformation change over time) and the resulting viscous stresses at any given point. The fluid's velocity vector determines the amount of stress present.
(B) - Dilatant fluid:
Dilatant fluids, also referred to as shear-thickening fluids, experience an increase in viscosity that is greater than linear as the shear rate rises.
(C) - Pseudoplastic fluid:
Pseudoplastic fluids, also known as shear-thinning fluids, demonstrate a decrease in viscosity as the shear rate increases. They do not possess a yield stress but exhibit a perceived rise in viscosity with increasing shear rate.
(D) - Thixotropic fluid:
Thixotropic fluids require a finite amount of time to attain equilibrium viscosity when subjected to a sudden change in shear rate. Some examples include lubricants, which can thicken or solidify when agitated.
Therefore, based on the given information, the fluid can be described as a dilatant fluid since its viscosity increases with increasing stirrer speed.