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Select the incompressible flow out of the following.(a) High speed gaseous flow(b) M=5(c) M=3(d) Liquid flowI had been asked this question in an interview.This intriguing question originated from Definition of Compressibility topic in section Compressible Flow – Preliminary Aspects of Aerodynamics

Answer» RIGHT answer is (d) Liquid flow

The best I can EXPLAIN: The HIGH speed gaseous flow is a compressible flow due to high compressibility of gases. Liquid flow is incompressible due to low compressibility of LIQUIDS. And M=5 or M=3 is compressible flow since the incompressible flow has M<0.3 only.


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