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Mechanical Engineering QUESTION #2410
Question 1
The Weber number \(We\) governs flows where surface tension forces are important. It is defined as:
  • \(We = \rho L V^2 / \sigma\) — ratio of inertial to surface tension forces✔️
  • \(We = \sigma / (\rho L V^2)\)
  • \(We = \mu V / \sigma\)
  • \(We = \sigma L / (\rho V^2)\)
Correct Answer Explanation
Weber number: \(We=\rho LV^2/\sigma\) where \(\sigma\) is surface tension (N/m). Important in droplet formation, bubble dynamics, and thin film flow.