Question

In a circular tube of diameter 100 mm and length 13 m with laminar flow, the friction factor is estimated to be 0.05. Calculate the Reynolds number?
1. 950
2. 2300
3. 1280
4. None of the above

Answer 1

Correct Answer - Option 3 : 1280

Concept:

laminar flow Friction factor ⇒ \(f = \frac{{64}}{{Re}}\) 

Where Re is the Reynolds number

For laminar flow friction factor depends only upon the Reynolds number of the flow  

Calculation:

Given, f = 0.05

\(0.05 = \frac{{64}}{{Re}} \Rightarrow Re = \frac{{64}}{{0.05}} = 1280\)

<!--[endif]-->