Terminal Velocity of Cylinders Rolling in Uniform Flows
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 9
Abstract
Ordnance remediation projects suggest that understanding the motion of cylinders (the approximate shape of ordnance) in flows would help to predict regions of ordnance mobility, to prioritize remediation efforts, and to improve the design of engineering works to trap ordnance. In simplified experiments, the characteristics of motion of smooth, unrestrained cylinders in contact with a smooth horizontal bed were investigated in flume experiments with steady, uniform flows. Eight cylinders were tested with varying specific gravities and diameters. At low flows, the cylinders follow trends similar to those noted in sediment particle studies. Incipient motion velocities were highest for the heavier cylinders. At high flows, the terminal velocity of the cylinders was limited to 60–80% of the free-stream flow. Potential flow derivations imply a maximum velocity ratio of 71%. Use of potential flow theory was considered valid (as an estimator) based on previous studies of boundary-layer control that suggest the moving surface of the cylinder minimizes the wake downstream of the cylinder, and therefore only a thin boundary layer is present around the cylinder.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 9 • September 1999
Pages: 943 - 952
History
Received: Nov 10, 1997
Published online: Sep 1, 1999
Published in print: Sep 1999
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