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relation between pressure drop and gas-wall friction?

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Old   September 20, 2009, 08:48
Default relation between pressure drop and gas-wall friction?
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What is the relation between the pressure drop and the wall shear stress in a pipe flow? they are largely equal to each other regardless laminar or turbulent flow? Here the wall shear stress is calculated by viscosity*gradient(u)/dn.
Your hints would be greatly appreciated.

Last edited by gonski; September 20, 2009 at 17:04.
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