Question

Consider the following statements regarding laminar flow through a circular pipe:

1. The friction factor is constant.

2. The frictional factor depends upon the pipe roughness.

3. The friction factor varies inversely with the Reynolds number of flow.

4. The velocity distribution is parabolic.

Which of these statements are correct?

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

Answer 1

The correct option is B 3 and 4

$\text{Friction factor}=\frac{64}{\text{Reynold's number}}$



Velocity distribution for laminar flow through circular pipe is parabolic.