Civil Engineering - Hydraulics - Discussion

Friction factor f = 64/re re-reynolds no.

Friction factor for reynold no f = 16/re.

hf=f.l.v^2/2gd,
f=64/Re.

F = 64/Re - friction factor.

Co-efficient of friction f = 16/Re,
Therefore F = 4f =4 * 16/Re.

Thanks @Naveen.

I think B is the right answer.

hf = FLV^2/2gd.
Coefficient of friction f = 16/Re,
F=4f=4*16/Re.

Substitute all in the formula of hf.

So, A is the correct answer.

The correct answer to the question can be determined using the Darcy-Weisbach equation for head loss in a pipe:

hf = frac{4 f L v^2}{2 g d}.

For laminar flow, the Darcy friction factor () is given by:
f = frac{16}{Re}.

where Reynolds number () is:
Re = frac{ρ v d}{mu}.

Substituting into the equation:

hf = frac{16}{Re} times frac{4L}{d} times frac{v^2}{2g}.
hf = frac{16}{Re} times frac{4L}{d} times frac{v^2}{2g}.

Comparing this with the given options, option (A) is the correct answer:
frac{16}{Re}times frac{4L}{d} times frac{v^2}{2g}.