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    The hydrodynamic boundary layer thickness is defined as the distance from the surface where the
    Question

    The hydrodynamic boundary layer thickness is defined as the distance from the surface where the

    A.

    velocity equals the local external velocity

    B.

    velocity equals 99% of the local external velocity

    C.

    velocity equals the approach velocity

    D.

    Momentum equals 99% of the momentum of the free stream

    Correct option is B

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