Hi Charles.

06-Nov-03 07:12:02, Charles Angelich wrote to Jasen Betts


 CA> 1237daf63ac5 tech

 CA> Hello Jasen -

 CA>>> No, not really. Entrainment in this sense means to drag 'other'
 CA>>> air along with the air actually in contact with the fan blades.
 CA>>> In an air amplifier the 'blast' is generated using compressed
 CA>>> air via a nozzle but that will pull surrounding air with it in
 CA>>> the same general direction.

 JB>> problem is you get the opposite effect near a fan.

 CA> I have no idea what you are referring to here.

the wind follows the air pressure gradient and flows past the fan in the
wrong direction... (I've already described it in detail twice)

installing a shroud stops this backwards flow and therfore increases the
effectiveness of the fan.


 -=> Bye <=-

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