Chemical Engineering - Chemical Engineering Basics - Discussion
Discussion Forum : Chemical Engineering Basics - Section 1 (Q.No. 4)
4.
Friction factor for fluid flow in pipe does not depend upon the
Discussion:
39 comments Page 4 of 4.
Raghu said:
9 years ago
For laminar flow friction factor doesn't depend on length & diameter of the pipe.
But in the turbulent flow, it definitely depends on length and diameter because friction factor is a relative shear stress between fluid layers.
But in the turbulent flow, it definitely depends on length and diameter because friction factor is a relative shear stress between fluid layers.
Vishal said:
1 decade ago
But as we know h = 4flv2/2gd.
Mohammad said:
1 decade ago
Hi Guys.
Greetings.
As far as the friction factor is concerned it is true that the friction factor is independent of length, why ?
The answer is f is a dimensionless number and is a ratio of the shear stress at the wall of a conduit to the kinetic energy or velocity head of the flow, and thus you will not find any dependence of f(friction factor) on length.
Hope this answers your question.
Greetings.
As far as the friction factor is concerned it is true that the friction factor is independent of length, why ?
The answer is f is a dimensionless number and is a ratio of the shear stress at the wall of a conduit to the kinetic energy or velocity head of the flow, and thus you will not find any dependence of f(friction factor) on length.
Hope this answers your question.
A.k said:
1 decade ago
If we keep eyes on formula there is length in it. So how can you say that it does not depend on length.
Zakawat said:
1 decade ago
Re = flv2/2gD.
From above relation we can conclude that friction factor depend upon length of pipe. But f is independent of mass flow rate a/c to me.
From above relation we can conclude that friction factor depend upon length of pipe. But f is independent of mass flow rate a/c to me.
Aka said:
10 years ago
Pressure drop due to frictional loss is (4fLv^2)/(2gD). Where f is the fanning friction factor. And that is dependent on Reynolds number which is Dv*rho/mu.
Question asked is related to frictional factor and not pressure drop die to frictional losses.
Question asked is related to frictional factor and not pressure drop die to frictional losses.
Aka said:
10 years ago
Due*
Frictional*
Hence frictional factor is not dependent on length.
Frictional*
Hence frictional factor is not dependent on length.
Saswata said:
9 years ago
f = 16\ Re.
-> Re = Dvd\vicosity.
-> Re = Dvd\vicosity.
Priti singh said:
1 decade ago
Friction factor f is entirely dependent on the nature of the material so roughness is a measure so as density and viscosity of the fluid passing through the pipe.
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