Flow takes place at Reynolds Number of 1500 in two different pipes with relative roughness of 0.001 and 0.002. The friction factor
- A. Will be higher for the pipe with relative roughness of 0.001
- B. Will be higher for the pipe having relative roughness of 0.002
- C. Will be the same in both the pipes
- D. In the two pipes cannot be compared on the basis of data given
Answer: C. Will be the same in both the pipes
Explanation: Re = 1500 implies laminar flow. In laminar flow ($f = 64/Re$), friction factor depends only on Reynolds number and is independent of surface roughness.