Flow regimes in wet conical spouted beds using glass bead mixtures

查看全文 作　　者：Marcelo [1]S.Bacelos;Jos Teixeira [1]Freire

机构地区：[1]Universidade Federal de Sāo Carlos,Centro de Ciências Exatas e de Tecnologia,Programa de Pós-Graduacāo em Engenharia Química,Centro de Secagem de Pastas,Suspensōes e Sementes,Rod.Washington Luiz,Km 235,13565-905,CP 676,Sāo Carlos,SP,Brazil

出　　处：《Particuology》索引2008年第6卷第2期,共9页

摘　　要：Using a high-viscosity Newtonian fluid,glycerol,an experimental investigation was carried out to evaluate the stable spouting regime in conical spouted beds using four particle mixtures:a reference(monoparticles),a binary mixture,two ternary mixtures with flat and Gaussian distributions respectively.The mixtures were selected for particle diameters(dp) ranging from 1.09 to 4.98 mm and particle diameter ratios(dpL/dpS) ranging from 1.98 to 4.0.Experimental data show that pressure fluctuation signals of the bed,as indicated by changes in their standard deviations,provide suitable information to identify the range of operational conditions for stable spouting.However,the analysis of skewness of curves of pressure fluctuation as a function of air velocity appears not sufficient to identify a particular flow regime.For glycerol in the spouting regime,the standard deviation is noted to increase with increasing glycerol concentration due to the growth of interparticle forces.The implications of these research findings on the drying of suspensions in conical spouted beds using glass bead mixtures are also discussed. 关键词：圆锥形喷泉床二元混合物玻璃珠流体力学

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Flow regimes in wet conical spouted beds using glass bead mixtures

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