Question

For turbulent now the friction factor is function of (Reynolds number —surface roughness -both the Reynolds number and the surface roughness) of the pipe.

Answer 1

Both Reynolds and surface roughness

Step-by-step explanation:

For turbulent flow friction factor is a function of both Reynolds and surface roughness of the pipe.But on the other hand for laminar flow friction factor is a function of only Reynolds number.

Friction factor for turbulent flow:

1. For smooth pipe

`f=0.0032+(0.221)/(Re^(0.237))`

`5* 10^4<Re<4* 10^7`

2. For rough pipe

`(1)/(\sqrt f)=2\ log_(10)(R)/(K)+1.74`

Where R/K is relative roughness

Friction factor for laminar flow:

`f=(64)/(Re)`