Question

A Newtonian fluid is defined as the fluid which

• A. is incompressible and non-viscous
• B. obeys Newton's law of viscosity
• C. is highly viscous
• D. is compressible and non-viscous

Hint:

A Newtonian fluid’s viscosity is constant and independent of the shear rate, following Newton's law of viscosity.

Answer 1

The Correct Option is B

Step 1: Define Newtonian fluid.
A Newtonian fluid is one whose viscosity remains constant regardless of the applied shear rate. The fluid obeys Newton's law of viscosity, which states: \[ \tau = \mu \left( \frac{du}{dy} \right) \] Where \( \tau \) is the shear stress, \( \mu \) is the dynamic viscosity, and \( \frac{du}{dy} \) is the shear rate. Step 2: Conclusion.
Since the fluid follows Newton's law of viscosity, it is a Newtonian fluid. Final Answer: \[ \boxed{\text{obeys Newton's law of viscosity}} \]