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Particle dispersion and fluctuations in viscous liquid–solid fluidised Beds
Author(s) -
Han In Soo,
Lim Hyun Oh,
Kim Kee Tae,
Kang Yong,
Jun Ki Won
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21716
Subject(s) - porosity , dispersion (optics) , materials science , homogeneous , drop (telecommunication) , viscous liquid , particle size , maxima , thermodynamics , particle (ecology) , mechanics , chemistry , composite material , physics , optics , art , telecommunications , oceanography , performance art , computer science , art history , geology
Particle dispersion and fluctuations were investigated in a liquid–solid fluidised bed with viscous liquid media by employing the relaxation method based on the stochastic model. The bed expansion or contraction during the transient state was analysed by means of the histogram of pressure drop variation with elapsed time. The relaxation behaviour of the liquid–solid fluidised bed appeared to be heterogeneous followed by homogeneous expansion or contraction. Effects of liquid velocity ( U L ), particle size ( d P ), liquid viscosity ( µ L ) and liquid holdup or bed porosity ( ε L ) on the fluctuating frequency ( F ) and dispersion coefficient ( D P ) of fluidised solid particles were examined. The values of F and D P increased with an increase in d P but decreased with µ L and exhibited local maxima with variations of U L and ε L . The flow pattern of solid particles could be changed from uniform or pseudo‐homogeneous to turbulent random behaviour with an increase in the liquid velocity and liquid holdup or bed porosity. © 2012 Canadian Society for Chemical Engineering