Which one of the following statement is not correct?
1
In hydrodynamically smooth boundaries the thickness of laminar sub-layer is less than the roughness projections
2
For hydrodynamically smooth boundary friction factor ‘f’ depends only on Reynolds number
3
For boundaries in transitional region friction factor ‘f’ is a function of relative roughness and Reynolds number
4
In hydrodynamically rough boundary friction factor ‘f’ is solely dependent upon the relative roughness
5
In hydrodynamically smooth boundaries the thickness of laminar sub-layer is more than the roughness projections