X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

Paul and others - Bill did a very good description of
the spool experiment - but here is the sketch anyway -
no matter how hard yo blow, you will not blow it off.
You are right, however, in that it is not the same
case. I shot from the hip (now I really do not do that
ALL the time do I?). The case is much more complex
than either approach. While the plate rests on the
surface, ther is no flow through the covered passages
- ie no
pressure drop. so the plate will see the upstream
total pressure, and start to lift when that value
meets the
number computed from the weight. Now the velocity
through the rest of the core is proportional to that
pressure but is a lower than computed value as a
function of the "flow coefficient" (a generally
experimental value which would let you compute the
flow and inferred velocity just from pressure drop).

As the upstream pressure is increasesd the plate will
further lift, and the outward flow will be set by the
flow resistance of the perimeter gap- probably one
full velocity head loss from the plenum (under the
plate) pressure . An interesting mathemetical problem,
the accuracy of the results much a function of
assumptions. I think you should work on the little
anemometers.
Vance

You forgot to attach the sketch Vance. PL
 
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