Boundary layer thickness (?) is the distance from the surface of the s – McqOptions

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1.	Boundary layer thickness (?) is the distance from the surface of the solid body in the direction perpendicular to flow, where the velocity of fluid is equal to
A.	Free stream velocity
B.	0.9 times the free stream velocity
C.	0.99 times the free stream velocity
D.	None of the above
E.	Free vortex motion
Answer» D. None of the above

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