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Hysteresis in Cloud Heights During Solid Suspension in Stirred Tank Reactor: Experiments and CFD Simulations

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Title Hysteresis in Cloud Heights During Solid Suspension in Stirred Tank Reactor: Experiments and CFD Simulations
 
Creator SARDESHPANDE, MV
JUVEKAR, VA
RANADE, VV
 
Subject 2-phase flow
vessels
fluid
hysteresis in cloud height
solid velocity profiles
cfd
 
Description Solid suspension in stirred tank reactor is widely used in process industries for catalytic reactions, dissolution of solids, crystallization, and so on. Suspension quality is a key issue in design and operation of stirred reactor and its determination is not straight forward. Cloud height measurements of solid suspension provide a relatively simple way to quantify quality of suspension. In this work, experiments were carried out to quantify variation of cloud heights with impeller speed and particle characteristics. These measurements were carried out using visual observations, image analysis, and ultrasound velocity profiler techniques. The obtained data demonstrated the existence of hysteresis in cloud heights with respect to impeller speed. Apart from possible applications in reducing power required for achieving desired solid suspension quality, the existence of hysteresis also provides a new way to evaluate computational fluid dynamics (CFD) simulations of solid liquid flows in stirred vessels. An attempt was made to capture observed hysteresis in cloud heights in CFD simulations. The simulated results were compared with the experimental data. The presented models and results (experimental and computational) will he useful for simulating complex solid liquid flows in stirred reactors. (C) 2010 American Institute of Chemical Engineers AIChE J, 56: 2795-2804, 2010
 
Publisher JOHN WILEY & SONS INC
 
Date 2011-08-16T07:08:24Z
2011-12-26T12:54:48Z
2011-12-27T05:43:07Z
2011-08-16T07:08:24Z
2011-12-26T12:54:48Z
2011-12-27T05:43:07Z
2010
 
Type Article
 
Identifier AICHE JOURNAL, 56(11), 2795-2804
0001-1541
http://dx.doi.org/10.1002/aic.12191
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9422
http://hdl.handle.net/10054/9422
 
Language en