The dimensionless ratio relating fluid inertia forces to elastic forces is designated as__________________?
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Answer: A. Mach number
Explanation
Mach number is the dimensionless ratio representing the speed of a fluid relative to the speed of sound. This parameter directly relates fluid inertia forces to elastic forces within compressible aerodynamic flow fields. Engineering calculations use the Mach number to categorize flow regimes into subsonic, transonic, supersonic, and hypersonic. Dimensionless numbers allow engineers to scale experimental model results up to full-size prototype aircraft or rockets. Inertia forces represent the momentum of moving fluid particles, while elastic forces govern pressure wave propagation. Named after the Austrian physicist Ernst Mach, this number is fundamental in high-speed gas dynamics.
Froude number relates inertial forces to gravitational forces, crucial for open channel flow and ship design. Reynold’s number characterizes the ratio of inertial forces to viscous forces within any given fluid flow. Weber’s number evaluates the relative importance of inertial forces compared to surface tension in fluid jets.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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