Chemical Engineering - Chemical Engineering Basics - Discussion

@ALL.

Here the length given may refers to the (entrance length) afterwards the flow becames fully developed and hence friction factor start existing.

Pipe roughness; fluid density & viscosity and mass flow rate of fluid if these parameters u alter, frictional losses of particular will change. Isn't it? What is going to do by increasing or decreasing length.

@Laxman.

When the length increases friction losses increase. But f is independent of length.

It does not depend upon length but its depend upon flow rate because if the flow rate is high then friction is less.

So, A is the right answer.

Thanks all for explaining.

Friction factor does not depends on pipe length.

Yes, it should depend on length.

Yes, friction factor does not depend on the pipe length.

f = flv२/ DG.
f increase.
So L increases.

Friction factor depends on the Reynolds number of the fluid and the Reynolds number depend on the velocity, density and viscosity of the fluid regardless if that fluid is laminar or turbulent, we can say that all choices affect fluid properties except option A, now you might asking whats about option B (pipe roughness), pipe roughness effect fluid velocity that is why.

The only option that doesn't have any effect on the friction factor is the length of the pipe.