Integral equation solutions turbulent boundary layer

One approach to the solution of this equation is to assume that the pressure does not vary with v, and so it is specified by the external velocity distribution, v is computed from the continuity equation, leaving a differential equation in u to be integrated. However, this holds only for the laminar flow since turbulent boundary layers are inherently unsteady. The subsequent sections deal with the solutions of these equations in more detail. 

Integral momentum balance for laminar boundary layer. Before we use Eq. (3.10-48) for the turbulent boundary layer,.this equation will be applied to the laminar boundary layer over a flat plate so that the results can be compared with the exact Blasius solution in Eqs. (3.10-6)-(3.10-12). 

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