Cauchy number

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Cauchy number

(Also Hooke number.) In fluid mechanics, a dimensionless group that arises in the study of compressible flow.

The square of the Mach number, its physical interpretation is the ratio of inertia force (ρU2) to compressibility force (1/κ), where ρ is density, U is a characteristic speed, and κ is compressibility.

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