PLASMA FUNCTIONALIZATION OF MULTI-SCALE STRUCTURES

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PLASMA FUNCTIONALIZATION OF MULTI-SCALE STRUCTURES ( plasma-functionalization-multi-scale-structures )

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say that the pressure gradient is negative. The velocity profile depends on the flow regime. Indeed two flow regimes exist: the laminar flow and the turbulent flow with a transition between laminar to turbulent. 2.4. Separation In the case of an airfoil, due to the curvature of the wall an adverse pressure gradient appears. When the pressure gradient becomes positive, then separation takes place. In other words, the velocity gradient perpendicular to the plate decreases and when it becomes null the boundary layer detach the plate. This is the point of separation. Then instabilities appear and a back flow exists, this is the separation zone. The existence of such zone on an airfoil induces a lift reduction and an increasing of the drag. Increasing the incidence the adverse pressure gradient on the upper side of the airfoil becomes larger. For a given incidence angle (about 15°) separation occurs . The separation point is located close behind the leading edge. As a consequence the lift is widely decreased and the drag increased. 4

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