# Turbulent Boundary layer thickness on a flat plate

1. Apr 17, 2007

### Mitra

I am really confused. Would you please tell me what the turbulent boundary layer thickness is on a flat plate?

There is a well-known Schlichting formula in the previous editions of his book “boundary layer theory”, which is:

$$\delta = 0.37 X Re^{-0.2}$$

But actually I could not find this relationship in his 8th edition book, instead I found the Hansen Formula, which is:

$$\frac {\delta U}{\nu} = 0.14 \frac{Re}{\ln Re} G(\ln Re)$$

Last edited: Apr 17, 2007
2. Apr 21, 2007