I was just thinking about this idea again after seeing the dyson bladeless fan thread, we know air is full of moving molecules and atoms bouncing around in all directions, well what if you could get them to all move in the same direction?
I was thinking a specially designed surface and enclosure, perhaps down to micro scales at just the right angles, it would start to control some of the ones that hit at the right angle and create a general flow in one direction.
So you are saying can we make a jet and control the flow of air using the science of aerodynamics?
if so, then yes we can, it's just quite tough to get the air to all go in the direction you want it to, unless its all occurring inside a totally sealed vacuum or over a VERY short distance. Turbulence is a bitch
While I'm guessing this is just a random thought (I have those), I was wondering what you were thinking of in terms of application? If it is a replacement for computer fans and things, I would suggest that perhaps simply replacing the blades with jets of air would be fairly difficult to achieve, certainly no easier than a bladed fan and almost certainly much noisier and more complex.
Effectively what you want to do is create a vortex induced vacuum effect at a localised spot in a computer case (which is what a fan effectively does), while its interesting, *something* still has to be moving to do this, be it the nozzles generating a high pressure air jet, or the blades of a fan moving the air around them, EDIT or the "blade-less" Dyson fan you referred to initially.