Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?
Correct answer: A. Elastic
- A. Elastic
- B. Viscous
- C. Gravity
- D. None of these
Explanation
Mach number compares inertial forces with elastic or compressibility forces, so it becomes important when these effects dominate. Viscous-force importance is characterized mainly by the Reynolds number.
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