Theory of lift

[BigEndBob]

How wings really work - Research - University of Cambridge

I always show the student by placing a rule, which roughly wing shaped and spoon in the flow of water from a tap. The curved back of spoon is draw into the flow of water.
What would happen if the the tap and spoon were put in a vacuum?

[what next]

What would happen if the the tap and spoon were put in a vacuum?

Exactly the same, because in your expaeriment, the water takes the place of the air. It makes absolutely no difference what happens "outside" your setup!

[Whopity]

It is interesting that the article which is explaining Coander effect doesn't actually mention that. There are many good articles on the subject