Theoretical investigation concerning the hydraulic resistance in an annulus of concentric rotating cylinders is described. The axial is and tangential velocity distributions were introduced. The annulus flow assumed to be long enough and a uniform purely developed laminar flow is considered. Flow parameters, except the pressure are assumed as functions of the radial distance only. Rotation affects. the friction coefficient and both axial and tangential velocity distributions. The governing factors are the speed ratio, radil ratio and angular velocity ratio.
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