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Q: The Reynolds number widely used to classify flow behavior of fluids is the ratio of which one of the followings:
  • A. Inertial forces to gravitational forces
  • B. Inertial forces to viscous forces
  • C. Viscous forces to inertial forces
  • D. Viscous forces to gravitational forces
Correct Answer: Option B - To predict patterns in the fluid flow a parameter Reynolds number (Re) is used. Re is a dimensionless quantity.
B. To predict patterns in the fluid flow a parameter Reynolds number (Re) is used. Re is a dimensionless quantity.

Explanations:

To predict patterns in the fluid flow a parameter Reynolds number (Re) is used. Re is a dimensionless quantity.