Turbulent Boundary Layer
The turbulent flow near solid boundaries is described by empirically-determined relationships called the Law of the wall. Measurements show, that for turbulent flows, the velocity near the wall varies logarithmically with the distance from the surface. From dimensional analysis23.2 we obtain the law of the wall:
Correlation of measurements indicate and .
Figure: A sketch of developed turbulent boundary layer in dimensionless coordinates and .
Finally, the Law of the wall can be described:
The fully developed boundary layer can be viewed as divided into four regions:
Viscous sublayer is a region closest to the wall. In this region The fluid flow is always laminar here. The Viscous sublayer region is typically where .
Figure: A sketch of near wall detail of developed turbulent boundary layer in dimensionless coordinates and .