Abstract

In this paper, the velocity distribution around a rotating cylinder in a flow is investigated, and the effect of the roughness of the cylinder surface on the flow field is also investigated. As a research method, we measure the fluid force acting on a rotating cylinder and the flow velocity around the cylinder in a water tank experiment. The tank experiment was conducted under two conditions: in static fluid and in flow. In the flow, we measured both the speed-up side and the speed-down side due to the rotation of the cylinder. For the roughness of the cylinders, the roughness of the cylinder surface was changed by attaching water-resistant abrasive paper to the cylinder. Calculate mean flow velocity, Reynolds stress, and eddy kinematic viscosity from the measured flow velocity. In the case where only the cylinder is rotating in a stationary fluid, the effect of the cylinder surface roughness is strongly observed, the coarser the cylinder surface grain size, the stronger the velocity gradient in the circumferential mean flow velocity, and the overall Reynolds stress increases. In the flow, the effect of the cylinder surface roughness is small and the flow field does not change much.

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