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 kmgraju July 28, 2011 02:28

Sudden expansion

Dear friends
I have a question on fluid mechanics.

a 6cm dia pipe expands gradually to 9 cm dia pipe. walls of expansion section are angled 10 degree from the horizontal. if the flow exit from smaller to bigger dia pipe there is a flow separation in the downstream flow for certain length and then the flow becomes fully developed .
How to calculate exactly the distance from the start of expansion to the fully developed flow starts in the downstream flow?

Thanks

Regards
Govind

 ghorrocks July 28, 2011 02:33

Put a line across the downstream flow and take a velocity cross section. Then push the line downstream until the velocity is fully developed to within a tolerance you specify.

 kmgraju July 28, 2011 11:27

sudden expansion

Quote:
 Originally Posted by ghorrocks (Post 317815) Put a line across the downstream flow and take a velocity cross section. Then push the line downstream until the velocity is fully developed to within a tolerance you specify.
Thanks for your information. Is there any mathematical method to calculate where the flow starts to develop fully?

Thanks

Regards

Govind

 ghorrocks July 28, 2011 18:35

What do you mean by mathematical? My description is mathematical.

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