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Will it be feasible to use Dyson fans in the ceiling since it has to draw air from the back to "push" towards the front?

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closed as off-topic by Dilaton, Emilio Pisanty, Manishearth Aug 12 '13 at 13:25

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question appears to be about engineering, which is the application of scientific knowledge to construct a solution to solve a specific problem. As such, it is off topic for this site, which deals with the science, whether theoretical or experimental, of how the natural world works. For more information, see this meta post." – Manishearth
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This question appears to be off-topic because there is no physics in this question. – Dilaton Aug 11 '13 at 21:23

The fans work by entrainment of surrounding air by the jet blowing out of a slit in the ring. Obviously it is optimized for entraining air from behind the ring, but it should also pull in air from the sides if the back is blocked. Most fluid dynamics textbooks will discuss the problem of a planar jet coming out of a wall, this is essentially the same thing. My guess is it would still work if you mounted the ring directly against the ceiling, but with significantly less efficiency. If you mounted it with about 1 ring radius separation from the ceiling it would probably work with close to maximal efficiency.

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