The discharge of fine silica sand in a silo under different ambient air pressures

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题名:	The discharge of fine silica sand in a silo under different ambient air pressures
作者:	蕭述三;Hsiau, Shu-San;Liao, Chun-Chung;Lee, Jie-Hsien
贡献者:	秘書室
关键词:	Critical pressure;Cross-disciplinary physics: materials science;rheology;Discharge;Exact sciences and technology;Fluid dynamics;Fluid flow;Granular solids;Material form;Mathematical analysis;Physics;Pressure;Rheology;Sand;Silos
日期:	2012-04-02
上传时间:	2026-04-23 11:58:44 (UTC+8)
出版者:	American Institute of Physics;Melville, NY: AIP Publishing
摘要:	摘要： Silos are widely used for the industrial scale handling and transportation of powdered and granular materials. The process of discharging powder in a silo involves the flow of both solid particles and an interstitial fluid, usually air. In this study, we experimentally investigate the effects of particle size and ambient pressure on the discharge process in open- and closed-top silos. The discharge rate, pressure drop, and pressure recovery rate are measured and discussed. The results show that the particle size, the diameter of the orifice, and the ambient pressure significantly influence the process of discharge. The effect of air flow is stronger on fine-powdered flow in a closed-top silo. The results indicate that the effects of air flow could be reduced by lowering the ambient pressure. In addition, a normalized critical pressure can be defined beyond which the discharge rate increases dramatically. With reduced ambient pressure, this normalized critical pressure decreases with increasing particle size. Finally, the experimental results are compared with results calculated using the Beverloo equation and Darcy's law. 出版者： Melville, NY: AIP Publishing 出版日期： 2012-04-01 出處： Physics of Fluids, 2012-04, Vol.24 (4), p.043301-043301-14 資源來源： AIP Journals (American Institute of Physics) 版權： American Institute of Physics 版權： 2012 American Institute of Physics 版權： 2015 INIST-CNRS 識別號： ISSN: 1070-6631 識別號： EISSN: 1089-7666 識別號： DOI: 10.1063/1.3700979 識別號： CODEN: PHFLE6
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