How is the boundary layer thickness defined? (ue is the outer edge vel – McqOptions

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1.	How is the boundary layer thickness defined? (u_e is the outer edge velocity)
A.	u = 0.99u<sub>e</sub>
B.	u = 0.89u<sub>e</sub>
C.	u = 0.90u<sub>e</sub>
D.	u = 0.50u<sub>e</sub>
Answer» B. u = 0.89u<sub>e</sub>

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