AST 210/EE 213 - Lecture 16: Blackbody radiation

[racastilho]

Yeah, I agree... I heard this explanation before, and always thought the same... why should the air particles separated by the wing meet again at the same time behind the wing?

[spacewings83]

I think it's correct: at the trailing edge (TE) the direction of the two streams is the same because the velocity must be everywhere tangent to the airfoil contour and they must also have the same pressure because a fluid line cannot withstand a pressure gradient. There are two possibilities: TEs with different tangents must have velocity equal to zero, TEs with unique tangent must have Vupper = Vlower.

[live4Cha]

i think you need to know more about the complex and confusing relationships in thermodynamics. Maybe you use just the "ideal gas" models?

[Newtoon]

There is complete wrong stuff at 04:35.

Would the teacher explain from which theory, air split at the beginning of airfoil has to run at the exact correct pace so that it meets its counterpart at the end of the airfoil ?

Actually, experiments show that the air going at the top does not meet but is "in advance" relatively to the air at the bottom.