Experiments were made on the orientation of cylindrical particles in viscous flow. Particles were immersed in a moving fluid between two concentric cylinders. Tests showed two different final orientations: (1) a position perpendicular to the plane of the undisturbed flow, and (2) a position parallel to the velocity direction. The relation between the final orientation and the lengthhyphen;diameter ratio of the particle was found for different speeds. Comparison is made between the experimental results and theoretical predictions.
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