Chemical Engineering - Chemical Engineering Basics - Discussion

Oh really. It should depend on length by looking at the formula we can say this. Also by logic, more the length more will be the friction. Please correct me if I am wrong. Thanks.

The correct option is "pipe length" and "mass flow rate of fluid".

The friction factor for fluid flow in a pipe depends on the pipe's roughness, fluid density and viscosity, and the flow conditions, such as the Reynolds number and the velocity of the fluid. However, it does not depend on the length of the pipe. This is because the friction factor is a property of the pipe and fluid system, and is independent of the distance over which the fluid flows.

Similarly, the friction factor is not directly dependent on the mass flow rate of the fluid. However, the mass flow rate can indirectly affect the friction factor by influencing the velocity and Reynolds number of the fluid.

But as we increase pipe length friction will increase then how option A?

In turbulent flow the friction formula also based length of the pipe. Then how should it be independent on the length? Please explain.

Friction is the resistance of slipping a fluid to fluid particles or layers and its boundary.

The factors considered are the roughness of the pipe, viscosity and density of the fluids, velocity or flow rate of the fluid and diameter of the pipe.

@A.K.

The formula is hf = 4fLv2/2gD.

Which is made to find out the friction loss in the pipe, so the friction loss hf (frictional head) is dependent on length (how long we want to pump a fluid).

To find out friction factor value we prefer Analogies (Reynold or Colburn Analogy etc) which are fully based on dimensionless numbers(Prandtl and Stanton number) in those numbers you will never find any length factor.

On this basis I'm claiming the friction factor is independent of length.

Hope this answers your question.

It depends on the length not depended on the mass flow rate.

As F= 16/Nre.

And Nre= density*v*l/viscosity.

So it depend on length and not depend upon mass flow rate.

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

Yes, it should depend on length.