When does local velocity (u) reach 99% of the free-stream velocity - Heat Transfer

Q.  When the hydrodynamic boundary layer thickness (δ), which is the distance from the surface at which the local velocity (u) reaches 99% of the free-stream velocity, then
- Published on 12 Aug 15

a. (δ / x) = 5 / (Rex)(1/2)
b. (δ / x) = 5 / (Rex)(2)
c. (δ / x) = 10 / (Rex)(1/2)
d. (δ / x) = 10 / (Rex)(2)

ANSWER: (δ / x) = 5 / (Rex)(1/2)

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