How do "air nozzles" in airplanes concentrate air flow so well?

Question

I'm working on a project that requires concentrating air flow into a beam such that it can travel longer distances through an unconstrained medium (i.e. open space, not a hose).

Something that came to mind are those little air nozzles that you find on air planes. These seem to do a pretty good job of directing air through a narrow path such that it doesn't effect nearby passengers.

What kind of mechanism is used to maintain this tight air flow?

amI · Answer

The first trick is to get the air molecules flowing in just one direction.  You can do this by forcing them through a 'bundle of straws' rather than one tube.

How do "air nozzles" in airplanes concentrate air flow so well?

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