Q. For a pipe flow, the ratio of inertia force to viscous force is given by

A
Mach number
B
Prandl number
C
Weber number
D
Reynolds number
Solution:

Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities, which is known as a boundary layer in the case of a bounding surface such as the interior of a pipe.

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