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Friction concentric rotating cylinders

Friction concentric rotating cylinders

Friction concentric rotating cylinders

(OP)
Hello All,

I am trying to calculate the friction (torque) between two concentric cylinders.
Inside one is roating at 750 rpm, diameter is 826 mm and diametrical clearance is 4 mm.
Outside cylinder is static. Length 98 mm.
I guess it should be quite large but couldn't find any reference.
Maybe you can give some advice or reference.

Thanks in advance.

RE: Friction concentric rotating cylinders

(OP)
I forgot to say that there is sea water in between.

RE: Friction concentric rotating cylinders


This is a classic hydrodynamic lubrication problem.
Almost any handbook in mechanical engineering will give a nomograph for the problem.

 

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