Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division August 29, 2001 revised manuscript received December 27, 2001. Associate Editor: M. M. Khonssari.

When two circular discs are supplied with air under pressure through a central hole, the lower disc will be attracted or repelled. Willis 1 in 1828 first described an experiment to study radial flow between a pair of parallel discs with air supplied through a tube to the center of one of the discs. He found that, for a constant air supply, as the two discs were brought together the force between the discs was initially repulsive then became attractive and eventually repulsive and of a much greater magnitude when very close together. Theoretical solutions have been discussed in references 2,3,4,5,6,7...

1.
Willis
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R.
,
1828
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On the Pressure Produced on a Flat Plate When Opposed to a Stream of Air Issuing From an Orifice on a Plane Surface
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2.
Asawa
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Pramond N. A.
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1985
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Radial Turbulent Flow Between Parallel Plates
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Boyack
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Rice
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W.
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An Integral Solution for the Laminar Radial Outflow of a Viscous Fluid Between Parallel Stationary Discs
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Radial Turbulent Flow of a Fluid Between Two Coaxial Discs
,”
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Johnson
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Radial Flow Between Axisymmetric Nonparallel Plates of Small Slope
,”
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Geiger
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Steady Radial Flow Between Parallel Plates
,”
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Lee
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Pressure Distribution for Radial Inflow Between Narrowly Spaced Discs
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Moller
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P. S.
,
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Radial Flow Without Swirl Between Parallel Discs
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Moller, P. S., “A Radial Diffuser Using Incompressible Flow Between Narrowly Spaced Discs,” Paper No. 65-FE-12.
11.
Savage
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S. B.
,
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Laminar Radial Flow Between Parallel Plates
,”
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12.
Solovyov
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,
Volpert
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Vatistas
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15.
Walanetz
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A Suction Device Using Air Under Pressure
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16.
Wilkes
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Woolard
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