Which is an example of both Reynolds and Froude numbers? - ProProfs Discuss

# Which is an example of both Reynolds and Froude numbers?

A. Motion of a submarine at large depths
B. Motion of ship in rough seas
C. Cruising of a missile in air
D. Flow over spillways

This question is part of Dimensional Analysis and Similitude
Asked by Trneelakantan, Last updated: Mar 25, 2020

#### Chris Kenway

Chris Kenway, Content Writer, Jacksonville

The correct answer to this question is B, Motion of ship in rough seas\r\n. Made popular by Osborne Reynolds, Reynolds numbers are calculated by using the formula Re= pvl over u = vl over v. In this formula, V represents the velocity of fluid, l is the chracteristics length, p is the density of fluid, u is the dynamic viscosity of fluid, and v is the kinematic viscosity of fluid. Named after engineer William Froude, a Froude number is defined as Fr = v/(gd)1/2. G0 is the external field, u) is the flow velocity, and l0 is the characteristic length.

John Smith