Chemical Engineering - Chemical Engineering Basics - Discussion

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.

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

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.

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

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.

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

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

Yes, it should depend on length.

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.

Friction factor does not depends on pipe length.