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Is supersonic flow not possible in a venturi tube?

Supersonic flow is possible in a Venturi tube, just not at the throat. In order for the flow at the throat to be supersonic, there would have to be a location somewhere between the upstream (...
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How do water tunnel experiments compare to wind tunnel experiments?

TL;DR Your calculations are correct. As stated by [1], "In flow situations that are insensitive to Reynolds number, or where a test Reynolds number is close to that of a full-size vehicle, water ...
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