What is the safest blockage ratio?

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The discussion focuses on determining the optimal blockage ratio for a small ball in a tube to maintain stable pressure. Participants emphasize that pressure drops occur with restrictions in the pipe and suggest providing more specific details or diagrams for clarity. The blockage ratio is defined as the area of the ball compared to the area of the tube. The user seeks to compare their findings with standard blockage ratios used in wind tunnel experiments. Accurate calculations and references to relevant resources are requested to aid in this analysis.
Donny
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Hello!

Anyone can help me to find the best blockage ratio between for a small ball in tube? so the pressure can stay up (not drop).
How to calculate it.

Thank You.
 
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Anyone?

Could somebody please point me how to get it? ebook, website, etc?
 
pressure ll always drop if there is a restriction in the pipe, you need to be more specific. can you show any diagram?
 
I want to calculate what is the safest ratio for blockage ratio.
Here is the diagram.

As you can see, the ball is in the middle of the tube. The ball has blockage ratio which is Area of ball:Area of tube
I want to compare my blockage ratio with the standard blockage ratio for wind tunnel.
 

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