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Forum: Main CFD Forum

October 25, 2013, 10:04

Replies: 5

Centreline velocity in pipes

Views: 24,437

Posted By triple_r

Boundary layer, in the sense that is defined in...

Boundary layer, in the sense that is defined in external flows, for a pipe grows when flow is developing, and as soon as it becomes fully-developed, then boundary layer thickness is equal to the pipe...

Forum: Main CFD Forum

October 18, 2013, 10:23

Replies: 5

Centreline velocity in pipes

Views: 24,437

Posted By triple_r

As a rule of thumb you can use: u_{max}=1.2...

As a rule of thumb you can use:

u_{max}=1.2 U

for fully-developed, turbulent flows in a circular pipe. But the factor of 1.2 changes with Reynolds number. It should be okay for your case...

Forum: Main CFD Forum

October 16, 2013, 13:31

Replies: 5

Centreline velocity in pipes

Views: 24,437

Posted By triple_r

Center-line velocity is usually the maximum...

Center-line velocity is usually the maximum velocity in the pipe, so it is, most of the time, larger than the average velocity.

Average velocity is easy to calculate:

\dot{m}=\rho U A

so if...

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