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 3 of 4.
Suraj singh said:
9 years ago
When the flow of liquid then in pipe flow work below the ATM pressure hence friction formula says depend on length but not a roughness because roughness is different for different material.
S.K. said:
1 decade ago
Can someone please explain how friction factor depends on mass flow rate of the fluid?
Giri said:
1 decade ago
dp=4flv2(density)/2g.
So it should depend upon length.
So it should depend upon length.
Abhilash said:
1 decade ago
We can calculate it by equation 16/Re. where Re is the Reynolds no. and as we know that Re = density*vel*dia/viscocity.
Thabasum said:
1 decade ago
hfs = (4flv^2)/2d it's simplifies.
f = (hfs*2d)/(lv^2).
f is doesn't depends on l and v.
f = (hfs*2d)/(lv^2).
f is doesn't depends on l and v.
Anjali said:
1 decade ago
But one Formula says that it depends on length.
dh = (4*f)* (l/d)* (u2/density*g)
Than...?
dh = (4*f)* (l/d)* (u2/density*g)
Than...?
Hardik said:
1 decade ago
As for Calculating the Fanning Factor density and viscosity required. and then friction factor is 2*fanning factor*length*square of velocity/Dia of Pipe.
SO ITS DEPEND ON LENGTH.
SO ITS DEPEND ON LENGTH.
Hardik sharma said:
1 decade ago
To calculate the velocity (if it is not given) by continuity Eqn. Mass flow is required so I think it does not depend on roughness.
Subhra Kanti Dhar said:
1 decade ago
For laminar flow in pipe f=16/Re. & for turbulent flow in pipe f=0.0791*Re^-0.25. And Re depends upon fluid density, dynamic viscosity, dia of the pipe, fluid velocity. So Re does not depend upon length. That is why f is independent of length.
Narendra said:
1 decade ago
F depends upon Re and Re doesn't depend upon length and roughness depend upon dia only so A.
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