1.

“Mach is the Dimensionless quantity”.(a) True(b) FalseI had been asked this question in homework.This interesting question is from Classification of Fluids topic in portion Fluid Flow and Mixing of Bioprocess Engineering

Answer» CORRECT choice is (a) True

To EXPLAIN: In fluid DYNAMICS, the Mach number (M or Ma) is a dimensionless quantity representing the ratio of flow velocity past a boundary to the LOCAL speed of sound.

where:

M is the Mach number,

u is the local flow velocity with respect to the boundaries (either internal, such as an OBJECT immersed in the flow, or external, like a channel), and

c is the speed of sound in the medium.


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