Journal of Fluid Mechanics

Some experiments on equilibrium turbulent boundary layers in favourable pressure gradients

H. J.  Herring a1 and J. F.  Norbury a1p1
a1 Department of Aerospace and Mechanical Sciences, Princeton University, Princeton, N.J.

Article author query
herring hj   [Google Scholar] 
norbury jf   [Google Scholar] 


A wind tunnel in which an arbitrary negative pressure gradient could be developed has been built for boundary-layer studies. The effects of selected pressure gradients on boundary layers grown on one of the walls of the tunnel were studied. It was possible to obtain equilibrium boundary layers of the type first suggested by Clauser: that is, layers whose non-dimensional velocity-defect distribution is invariant along the direction of flow. The velocity-defect distributions for two such boundary layers were established, corresponding to values of Clauser's dimensionless pressure-gradient parameter β of −0·35 and −0·53. These velocity profiles are compared with the profiles predicted theoretically by Mellor & Gibson (1966). The agreement between the two is very good.

(Published Online March 28 2006)
(Received July 16 1965)
(Revised July 18 1966)

p1 Present address: Department of Mechanical Engineering, University of Liverpool.