Animation & Explanation made by BIGS


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fluid mechanics

Genaral information on “Fluid in a pipe”

A1 – is the streamed cross-section on the left side
1 – is the corresponding streaming velocity

A2 – s the streamed cross-section in the middle
2 – is the corresponding streaming velocity in the middle part

V – A*v*dt leads to the streamed volume

The animation shows a streamed tube where no liquid can leave the tube through the body.

On the one side the volume A1v1dt stream into the tube and on the other the volume A2*v2*dt streams out of the tube.
As a precondition we assume the liquid to be incompressible both volumes have to be the identical according to the continuity equation:


 A1 * v1 = A2 * v2.

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