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 
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.

sudden expansion
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Thanks Regards Govind 
What do you mean by mathematical? My description is mathematical.

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