Consider the left hand side of Eqn. (19.9)

	(20.6)

The Reynolds-stress term in the thin-shear-layer equation (19.9) is

	(20.7)

The choice of F in the profile for the streamwise velocity is related to stream function and the continuity equation. The length scale can be chosen to be the half-width, defined as

(20.8)

Preservation of self similarity requires . The measurements show that   for

where d is the diameter of the orifice from where the jet is emanating .