INVESTIGATION OF DRAG FORCE AND DRAG MOMENT OF ROTATING TRANSLATIONALLY MOVING SPHERE IN CALM WATER

Abstract eng:
The paper describes results of experiments with rotating spherical particles moving quasi-steadily in the calm water. The motion of the particles was recorded by a digital video camera. The Cartesian coordinates and the angle of rotation of the particles were determined from the record of the particles motion. The dimensionless drag coefficient, drag moment coefficient and translational and rotational Reynolds numbers were calculated from the time series of the particles coordinates and angle of rotation for each recorded frame. The effect of the particles translational motion on the drag moment and the effect of the particles rotation on the drag force were evaluated from the experimental data.

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