Bernoulli Theory

1
Stop Bernoulli Abuse
Daniel Bernoulli (1700-1782)
It would be better for the true physics if
there were no mathematicians on earth
2
This diagram appears in high school and college
text books as well as in books and website
articles on airplane lift. Although this
theory has almost universal acceptance, it
represents a misapplication of Bernoullis
principle.
3
This diagram also appears in popular books that
purport to explain lift. These diagrams do not
show the motive for the flow. These diagrams
indicate only part of the loop. These diagrams
assume constant density.
4
When you blow air into the top of the spool, the
card sticks to the bottom of the spool.
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Experimental setup
Detail of plenum and orifice
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Tube and Cone Experiment
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The Business Card Levitator
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Levitation disks
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Parallel flow
Radial flow
Levitation requires radial flow
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Hydraulic Jump Radial momentum produces a
hydraulic jump
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Radial momentum produces a cavitation ring
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Condensation occurs on humid days
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Lab setup showing aluminum foil spacers
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Flux vs Pressure Notice the decrease of flux
with pressure for the heavier weights.
Flow vs Pressure Detail The higher the pressure,
the lower the flow
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Simulation model showing the behavior of key
variables in the gap between plates
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