THE STABILITY OF WET SPOUTED BEDS
作者:
Torsten Schneider,
John Bridgwater,
期刊:
Drying Technology
(Taylor Available online 1993)
卷期:
Volume 11,
issue 2
页码: 277-301
ISSN:0737-3937
年代: 1993
DOI:10.1080/07373939308916820
出版商: Taylor & Francis Group
关键词: cohesive forces;spoutability chart;spouting velocity;bed pressure drop;processing liquid and pasty materials
数据来源: Taylor
摘要:
In granulation, coating or drying of slurries on inert particles a liquid phase is added to a gas-spouted bed. The effect of liquid injection on spouting velocity, fountain height, bed pressure drop and stability of the spouting regime is examined in a 0.15 m diameter bed with four types of inert particles 2 to 5 mm in size, 1140 to 2880 kg/m3in true density, and 1.3 and 1400 mPa·s in liquid viscosity. Key factors are the liquid content and the presence of cohesive forces due to liquid bonds between particles. In a spoutability chart the maximum spoutable liquid content is related to the ratio of inertial force of a particle to the viscous or cohesive force exerted onto the particle by the liquid film. The spoutability chart serves to define regions of stable spouting.
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