1237dae68c62
tech



Hello Jasen - 

CA>> No dongle at all. Check for "air amplifier" then
CA>> "entrainment" and you should find what I am referring to.
CA>> A jet of air pulls other air along with it which increases
CA>> the volume of air being moved. 

JB> yeah, but a fan with no shroud doesn't produce a jet. 

A fan _with_ a shroud can hardly be described as a 'jet'. 

JB> What tends to happen with no shroud (or other duct around
JB> the fan) is that air circulated from the front of the fan
JB> round the side to the back of the fan reducing the
JB> efficiency of the fan. 

JB> this "entrainment" needs a focussed jet and free space
JB> longer than the diameter of the jet before the effect
JB> becomes significant, and you won't find those conditions in
JB> an engine bay. 

Entrainment refers to moving air dragging 'other' air
surrounding it in the same general direction. What you are
describing is the air amplifier which makes _use_ of air
entrainment. The jet is not a part of the definition of
'entrainment'. 

>
>        ,                          ,
>      o/      Charles.Angelich      \o       ,
>       __o/
>     / >          USA, MI           < \   __\__
 

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