Stop Bernoulli Abuse

“It would be better for the true physics if there were no mathematicians on earth”

Daniel Bernoulli (1700-1782)

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 Bernoulli’s principle.

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.

When you blow air into the top of the spool, the card sticks to the bottom of the spool.

Experimental setup

Detail of plenum and orifice

Tube and Cone Experiment

The Business Card Levitator

Levitation disks

Parallel flow

Radial flow

Levitation requires radial flow

Hydraulic Jump

Radial momentum produces a hydraulic jump

Radial momentum produces a cavitation ring

Condensation occurs on humid days

Lab setup showing aluminum foil spacers

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

Simulation model showing the behavior of key variables in the gap between plates

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