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Transition Criteria for Fluidized Beds Revisited

DSpace at IIT Bombay

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Title Transition Criteria for Fluidized Beds Revisited
 
Creator KORALKAR, N
KOTTAKOTA, G
BOSE, M
 
Subject MECHANICAL DESCRIPTION
CIRCULATION PATTERNS
HIGH-TEMPERATURE
IMAGE-ANALYSIS
GAS
LIQUID
FLOW
HYDRODYNAMICS
SOLIDS
BEHAVIOR
Aggregative
fluidization
particulate
transition
 
Description Stability of the fluidized beds has been a topic of interest for several decades and a number of transition criteria in the empirical form as well as based on hydrodynamic description of the bed are available in literature. In the present work, two criteria derived using analytical arguments (Foscolo and Gibilaro 1984; Batchelor 1988) are revisited and expressed in terms of three non-dimensional independent variables, namely the density ratio, P-p/P-f superficial gas velocity (U*), and particle diameter (d(p)(*)). The transition criteria appear as a family of curves in between the dimensionless minimum fluidization and single particle terminal velocities for different values of De, on a classical U* - d(p)* plane. A set of 70 different observations through experiments and numerical simulation is mapped on to the U* d(p)* plane to examine the transition criteria. While both the criteria predict the in-homogeneity of the bed at higher De consistently, at lower De, the small scale perturbation is captured in the criterion proposed by Batchelor (1988) but not by the one defined by Foscolo and Gibilaro (1984); nevertheless, the current work presents the mapping of two analytically derived transition criteria on the classical U* d(p)* plane which is complimentary with earlier classifications proposed by Kunni and Levespeil (1991).
 
Publisher TAYLOR & FRANCIS INC
 
Date 2016-01-15T08:00:38Z
2016-01-15T08:00:38Z
2015
 
Type Article
 
Identifier PARTICULATE SCIENCE AND TECHNOLOGY, 33(4)393-405
0272-6351
1548-0046
http://dx.doi.org/10.1080/02726351.2014.981903
http://dspace.library.iitb.ac.in/jspui/handle/100/18113
 
Language en