5. The height of the boundary layer is reached when lu [a]-, ~ 0.99, where u is

Question

5. The height of the boundary layer is reached when lu [a]-, ~ 0.99, where u is the velocity in the boundary layer and U is the main stream velocity [b]--4.6, where is the boundary layer thickness, x the length of the plate [c] Re, = 5 x 105 d] None of the Above 6. Pitot tubes [named after Henri Pitot, a French engineer, 1700] you used in the lab, measures a] Total Pressure [b] Static Pressure [c] Dynamic Pressure [d] None of the above 7. When a small sphere is dropped in a fluid to evaluate the viscosity of the fluid, one should maintain the motion of the sphere with Re

Explanation / Answer

5)

a- when the velocity of the BL reaches 99% of the mainstream

6)

c- Dynamic Pressure and hence the velocity of the flow

7)

b- Stokes law

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