Observations on sand jets in air / Jianan Cai in Journal of engineering mechanics, Vol. 136 N° 9 (Septembre 2010)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1181-1186 Titre : Observations on sand jets in air Type de document : texte imprimé Auteurs : Jianan Cai, Auteur ; Neil Hall, Auteur ; Mohammed Elenany, Auteur Année de publication : 2010 Article en page(s) : pp. 1181-1186 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Sand material Velocity Particle size. Résumé : 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. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Observations on sand jets in air [texte imprimé] / Jianan Cai, Auteur ; Neil Hall, Auteur ; Mohammed Elenany, Auteur . - 2010 . - pp. 1181-1186. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1181-1186 Mots-clés : Sand material Velocity Particle size. Résumé : 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. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

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