Question

If the relationship between shear stress of a fluid is NOT linear to the velocity gradient, then the fluid is:

• A. a compressible fluid
• B. a non-Newtonian fluid
• C. an ideal fluid
• D. a Newtonian fluid

Answer 1

Answer:

B. a non-Newtonian fluid

If the relationship between shear stress of a fluid is not linear to the velocity gradient, then the fluid is a non- Newtonian fluid. Non-Newtonian fluids do not follow Newton's law of viscosity, and examples include slurries, polymer solutions, blood, toothpaste, and Quicksand. Ideal fluids do not exist in reality, while compressible fluids are sensitive to pressure changes, and significant density variations occur during their flow.