Select the flow which must be classified a viscous flow, a flow in which effects of viscosity cannot be neglected:
A) Flow through a pipe contraction
B) Flow through a rocket's nozzle
C) Flow around an airfoil
D) Flow in the entrance region of a pipe

Question

Quizplus · Accepted Answer

Flow in the entrance region of a pipe
In a contraction, a fluid is accelerated and viscous effects can be ignored. The same is
true in a rocket nozzle. Around an airfoil viscous effects are ignored except for a very
thin layer of the flow next to the airfoil surface. Viscous effects cannot be ignored in
the entrance region of a pipe; viscous effects cause the flow to assume the profile that
exists downstream of the entrance region.

Select the Flow Which Must Be Classified a Viscous Flow