Linear velocity profile laminar flow is given by U/U∞ = y/δ
If Van karman momentum equation is given by \(\frac{{d\theta }}{{dx}} = \frac{{{\tau _\omega }}}{{{\rm{\rho U}}_\infty ^2}}\); Where θ is momentum thickness
The boundary layer thickness δ at any x will be
1
\(\frac{{4.64x}}{{\sqrt {{R_{{e_x}}}} }}\)
2
\(\frac{{5x}}{{\sqrt {{R_{{e_x}}}} }}\)
3
\(\frac{{3.46x}}{{\sqrt {{R_{{e_x}}}} }}\)
4
\(\frac{{4.46x}}{{\sqrt {{R_{{e_x}}}} }}\)