Question

For laminar flow in a circular conduits, the energy correction factor α is taken as:-
1. 1.33
2. 1.03
3. 2.00
4. 2.50

Answer 1

Correct Answer - Option 3 : 2.00

Explanation:

Kinetic energy correction factor(α): 

• It is defined as the ratio of kinetic energy/second based on actual velocity to the kinetic energy/second based on average velocity.
• \(\alpha = \frac{1}{A}\mathop \smallint \limits_A^{} {\left( {\frac{u}{V}} \right)^3}dA\)
• where A = area, V= average velocity, u= local velocity at distance r.
• In circular pipe laminar flow α = 2