文献类型：期刊文献

英文题名：Gravitational discharge of fine dry powders with asperities from a conical hopper

作者：Lu, Hui[1];Zhong, Jia[1];Cao, Gui-Ping[1];Liu, Hai-Feng[2,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, UNILAB, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2018

卷号：64

期号：2

起止页码：427

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20174004223130);WOS:【SCI-EXPANDED(收录号:WOS:000419108000003)】；

基金：This research was supported by the National Natural Science Foundation of China (21706073) and the Fundamental Research Funds for the Central Universities (222201514017).

语种：英文

外文关键词：fine dry powders; surface roughness; van der Waals force; Bond number; powder flowability

摘要：The effects of particle properties, especially the surface roughness and particle type, on the gravity discharge rate and flow behavior of fine dry powders from a conical hopper are studied in detail. The van der Waals force is considered to dominate the discharge of small particles, while the empty annulus effect dominates the discharge of large particles. To predict the van der Waals force between two rough spherical particles, a model based on Rumpf theory is adopted. The effect of surface roughness can be reflected by Bond number Bo(g) which is correlated with discharge rate. By modifying the powder bed porosity and Beverloo constant, the discharge rates of fine dry powders can be well predicted by an empirical correlation. Finally, not only the ratio of hopper outlet size to particle size D-0/d(p) but also the Bond number Bo(g) is found to be an important indicator to determine the powder flowability. (c) 2017 American Institute of Chemical Engineers AIChE J, 64: 427-436, 2018