Unsteady Laminar Flow Along an Enclosed Rotating Disk : Fluids Engineering

Abstract

In order to understand unsteady laminar flow along an accelerating or decelerating disk in a closed cylindrical casing, experimental and theoretical studies were performed. A solution representing the unsteady pressure distribution on a rotating disk and the axial thrust was derived, and compared with that for turbulent flow. As a result, the following points were made clear: (1) Relative to the accelerating flow, the angular velocity of the center core at small radii is considerably smaller than that at large radii. This phenomenon is much different from that in a turbulent flow condition; (2) The time delay of the flow is comparatively small owing to the viscous effect; (3) Calculated results coincide pretty well with ones derived experimentally.