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
(D) 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.
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