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Updated: Jun 8, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Drag coefficient for a circular obstacle in a quasi-two-dimensional dilute supersonic granular flow
1Université Bordeaux 1, Centre de Physique Moléculaire Optique et Hertzienne, CNRS UMR 5798, 351 cours de la Libération, 33405, Talence France.
Abstract:
The measurement of the drag coefficient of a dilute granular flow around a cylinder is carried out over a wide range of Knudsen numbers. The variation of this coefficient shows a smooth transition from a freely falling grains regime to a continuous flow regime. This is reminiscent of the behavior of gases in the supersonic regime. This transition is accompanied by remarkable changes of the density and velocity profiles near the cylinder. A simple model is proposed for the transition regime which is in agreement with the experimental measurements.
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