Define the Pipe and Duct Flow?

Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Larry Jeffus
Chapter5: Shielded Metal Arc Welding Of Pipe
Section: Chapter Questions
Problem 4R: Describe the differences between pipe and tubing.
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Define the Pipe and Duct Flow?

 

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Pipe flow is the mechanical system used to distribute the liquid and is constraint to move within the walls of the pipe.

There are two types of flow in the pipe and they are laminar or viscous flow and turbulent flow.

When the fluid flows at low velocity or high viscosity it flows in the form of lamina due to viscous forces and is called laminar flow.

While when the fluid flows at high velocity or high viscosity then the flow is known as turbulent flow.

In pipe flow if the critical Reynold's is less than 2000 then it will be laminar flow and when the critical Reynold's number is greater than 4000 then it will be turbulent flow.

For the flow in pipe the generalized equation is Navier strokes equation and they are 

continuity equation- ·v=0

momentum equation- ρdvdt=-p+ρg+μ2v

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