IONIC MASS TRANSFER IN THREE-PHASE FLUIDIZED BEDS IN THE PRESENCE OF DISC PROMOTERS

Three-phase fluidized beds have wide applications in process industries. The present investigation is carried out to identify the enhancement of ionic mass transfer coefficients due to the presence of a disc promoter in a three-phase fluidized bed. A diffusion-controlled electrode reaction-reduction...

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Published in:	Chemical engineering communications Vol. 198; no. 8; pp. 1018 - 1032
Main Authors:	Murty, M. S. N., Ramesh, K. V., Venkateswarlu, P., Prabhakar, G.
Format:	Journal Article
Language:	English
Published:	Philadelphia Taylor & Francis Group 01-08-2011 Taylor & Francis Ltd
Subjects:	Augmentation Chemical engineering Chemical reactions Diffusion Disc promoter Discs Disks Electrodes Fluidized bed reactors Fluidized beds Ionic mass transfer Ions Liquids Mass transfer Three-phase fluidized beds Velocity Wall-to-bed mass transfer
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Abstract	Three-phase fluidized beds have wide applications in process industries. The present investigation is carried out to identify the enhancement of ionic mass transfer coefficients due to the presence of a disc promoter in a three-phase fluidized bed. A diffusion-controlled electrode reaction-reduction of ferricyanide ion-was employed to obtain mass transfer coefficient data. The mass transfer coefficient data were obtained by varying the geometric variables of the disc promoter (disc diameter, disc spacing) and dynamic variables (superficial liquid velocity, superficial gas velocity). The effect of particle diameter was also investigated. The investigations revealed that the mass transfer coefficients were enhanced with decreased disc spacing, increased disc diameter, increased superficial gas velocity, increased superficial liquid velocity, and increased particle diameter.
AbstractList	Three-phase fluidized beds have wide applications in process industries. The present investigation is carried out to identify the enhancement of ionic mass transfer coefficients due to the presence of a disc promoter in a three-phase fluidized bed. A diffusion-controlled electrode reaction-reduction of ferricyanide ion-was employed to obtain mass transfer coefficient data. The mass transfer coefficient data were obtained by varying the geometric variables of the disc promoter (disc diameter, disc spacing) and dynamic variables (superficial liquid velocity, superficial gas velocity). The effect of particle diameter was also investigated. The investigations revealed that the mass transfer coefficients were enhanced with decreased disc spacing, increased disc diameter, increased superficial gas velocity, increased superficial liquid velocity, and increased particle diameter. Three-phase fluidized beds have wide applications in process industries. The present investigation is carried out to identify the enhancement of ionic mass transfer coefficients due to the presence of a disc promoter in a three-phase fluidized bed. A diffusion-controlled electrode reaction -- reduction of ferricyanide ion -- was employed to obtain mass transfer coefficient data. The mass transfer coefficient data were obtained by varying the geometric variables of the disc promoter (disc diameter, disc spacing) and dynamic variables (superficial liquid velocity, superficial gas velocity). The effect of particle diameter was also investigated. The investigations revealed that the mass transfer coefficients were enhanced with decreased disc spacing, increased disc diameter, increased superficial gas velocity, increased superficial liquid velocity, and increased particle diameter. [PUBLICATION ABSTRACT]
Author	Ramesh, K. V. Venkateswarlu, P. Murty, M. S. N. Prabhakar, G.
Author_xml	– sequence: 1 givenname: M. S. N. surname: Murty fullname: Murty, M. S. N. email: msnmurty@yahoo.com organization: Department of Chemical Engineering , GVP College of Engineering – sequence: 2 givenname: K. V. surname: Ramesh fullname: Ramesh, K. V. organization: Department of Chemical Engineering , Andhra University – sequence: 3 givenname: P. surname: Venkateswarlu fullname: Venkateswarlu, P. organization: Department of Chemical Engineering , Andhra University – sequence: 4 givenname: G. surname: Prabhakar fullname: Prabhakar, G. organization: Department of Chemical Engineering , Sri Venkateswara University
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Cites_doi	10.1115/1.3247417 10.1016/j.cej.2007.03.024 10.1021/ie50501a045 10.1016/j.cej.2008.08.023 10.1080/00194500903361355 10.1002/jctb.856 10.1016/j.cej.2009.04.048 10.1002/cjce.5450590601 10.1016/j.expthermflusci.2010.10.003 10.1016/0255-2701(95)04112-5 10.1252/jcej.21.522
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References	Venkateswarlu P. (CIT0020) 2000; 22 Morooka S. (CIT0005) 1980; 20 CIT0010 CIT0021 Jagannadha Raju G. J. V. (CIT0003) 1965; 3 CIT0001 Treybal R. E. (CIT0019) 1981 CIT0011 CIT0022 Ramesh K. V. (CIT0012) 2009; 1 Sutton F. (CIT0018) 1935 Subbaiah T. (CIT0017) 1993; 9 Ramesh K. V. (CIT0008) 2008; 50 CIT0014 CIT0013 CIT0016 CIT0004 CIT0015 CIT0007 CIT0006 CIT0009 Fan L.-S. (CIT0002) 1989
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SubjectTerms	Augmentation Chemical engineering Chemical reactions Diffusion Disc promoter Discs Disks Electrodes Fluidized bed reactors Fluidized beds Ionic mass transfer Ions Liquids Mass transfer Three-phase fluidized beds Velocity Wall-to-bed mass transfer
Title	IONIC MASS TRANSFER IN THREE-PHASE FLUIDIZED BEDS IN THE PRESENCE OF DISC PROMOTERS
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