InAs an answer to "flow hits the top bump in the wing, it wants to keep a linear trajectory, and because the wing has curvature this will then create some kind of partial vacuum, and then this causes the pressure gradient. Am I right".... yes:
... flow hits the top bump in the wing, it wants to keep a linear trajectory, and because the wing has curvature this will then create some kind of partial vacuum, and then this causes the pressure gradient. Am I right?
Yes. The Bernoulli effect is simply a moving fluid stream carrying away the surrounding fluid, leaving a low pressure zone around it. If an object's surface is nearby it will be sucked onto the stream (my apology to Prof. Julius Sumner Miller, the atmosphere will push it on). The air travels faster over the top of an earoplane wing, relatively speaking, because it has further to go over the top in the same time . It is held on the surface by the Bernoulli effect & deflected downwards, sucking the wing up (sorry Julius, the atmosphere pushes it up).