Influencing Parameters
The tendency of a boundary layer to separate primarily depends on the distribution of the adverse or negative edge velocity gradient along the surface, which in turn is directly related to the pressure and its gradient by the differential form of the Bernoulli relation, which is the same as the momentum equation for the outer inviscid flow.
But the general magnitudes of required for separation are much greater for turbulent than for laminar flow, the former being able to tolerate nearly an order of magnitude stronger flow deceleration. A secondary influence is the Reynolds number. For a given adverse distribution, the separation resistance of a turbulent boundary layer increases slightly with increasing Reynolds number. In contrast, the separation resistance of a laminar boundary layer is independent of Reynolds number — a somewhat counterintuitive fact.
Read more about this topic: Flow Separation
Famous quotes containing the words influencing and/or parameters:
“Do you believe that the dead can influence the living?... Could you conceive of a superhuman mentality influencing someone from the other side of death?... There is such a one.... Someone, something that reaches out from beyond the grave and fills me with horrible impulses.”
—Garrett Fort (1900–1945)
“What our children have to fear is not the cars on the highways of tomorrow but our own pleasure in calculating the most elegant parameters of their deaths.”
—J.G. (James Graham)