Observations on Sand Jets in Air
Publication: Journal of Engineering Mechanics
Volume 136, Issue 9
Abstract
This note presents the results of an experimental study of circular sand jets in air from three nozzles of diameter of 19.2, 31.1 and 63.8 mm. It was found that the frontal speeds of the sand jets and the steady sand jet velocity accelerate due to gravity with negligible air resistance. The sand velocity does not appear to be affected by sand particle sizes for the three sizes tested. The diameters of sand jets, as they travel downwards, decrease and gradually approach an asymptotic value after a distance of 120 times of the initial jet diameter. The sand concentration in the jet decreases as the distance from the nozzle increases. Waves were observed at the periphery of the sand jet and some preliminary results of wave speed and wavelength are reported.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 136 • Issue 9 • September 2010
Pages: 1181 - 1186
Copyright
© 2010 ASCE.
History
Received: Oct 20, 2009
Accepted: Feb 19, 2010
Published online: Mar 12, 2010
Published in print: Sep 2010
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