Building a Flow bench

[Eric Fahlgren]

TVS wrote:
> 
> > Goes a little bit further. Basically--there is no way you are gonna may 25
> > to 33 inches of H2O pressure air  (33 allows for some ducting and
> > measurement losses) with ANY kind of a standard fan or blower wheel. You
> > are going to need multiple (compounded) fans OR, as I said, a regenerative
> > blower. End of story.
> 
> Yes, I believe it is quite acceptable to test the flow at a more manageable
> pressure drop, say 5" of H20 and then standardise the flow rate to 25" of
> H20. This can of course simply be done by multiplying the flow by the square
> root of the ratio of pressures.
> Toby

Ah, but that will only work if the Reynolds number remains in
more or less the same domain.  Since you are going to change
the pressure drop by a factor of 5-6, I would guess that the
velocities are changing by a like amount which will, of course,
impact Reynolds number quite significantly.

-- 
Eric Fahlgren                            Mechanical Dynamics, Inc
efahl at adams.com                          Ann Arbor, Michigan, USA

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