Question

Consider the following statements in respect of steady laminar flow through a circular pipe:


1. Shear stress is zero on the central axis of the pipe.

2. Discharge varies directly with the viscosity of the fluid.

3. Velocity is maximum at the centre of the pipe.

4. Hydraulic gradient varies as the square of the mean velocity of flow.

Which of these statements are correct?

• A. 1, 2, 3 and 4
• B. 1 and 3 only
• C. 2 and 4 only
• D. 3 and 4 only

Answer 1

The correct option is B 1 and 3 only

The shear stress and velocity distribution in a laminar flow through a circular pipe is as shown