HEAT TRANSFER IN A FIXED BED AND MASS TRANSFER IN A COUNTER-CURRENT MOVING BED

Persistent Link:
http://hdl.handle.net/10150/281984
Title:
HEAT TRANSFER IN A FIXED BED AND MASS TRANSFER IN A COUNTER-CURRENT MOVING BED
Author:
Dellaretti Filho, Osmario, 1944-
Issue Date:
1981
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The behavior of gas-solid reactors known as compact-fixed and moving beds, is analyzed from a theoretical viewpoint. For a compact fixed-bed the solution of the energy balance equations is obtained for the cases of a uniform temperature inside the solid pellets (i.e., the Biot number is zero) and for the case in which there are temperature gradients within the pellets (Bi > 0). For short contact times, beds with Bi > 0 have gas- and solid- temperatures which are greater than the temperatures within beds with Bi = 0. For long times, the situation is reversed. For a compact-moving bed the solution of the mass balance equations is obtained for the cases of a feed-solid with constant concentration and a feed solid with an oscillating concentration. In both cases the steady states obtained are unique, and internal recycling is observed only for a feed-solid with an oscillating concentration. Recycling is that situation when the concentration of the solid falls below that of the gas for a bed in which the feed-solid is greater than the feed-gas. This occurred when the period of oscillation was smaller than the residence time of the solid provided that the residence time of the solid was not very short (i.e., provided that B(,s) > 0.1). For both types of beds there is an equivalence between mass transfer and energy transfer so that the solutions can be interchanged with suitable definitions of dimensionless variables.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Heat -- Transmission -- Mathematical models.; Heat-transfer media -- Mathematical models.; Gas cooled reactors.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Metallurgical engineering
Degree Grantor:
University of Arizona
Advisor:
Poirier, David R.; Geiger, Gordon H.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleHEAT TRANSFER IN A FIXED BED AND MASS TRANSFER IN A COUNTER-CURRENT MOVING BEDen_US
dc.creatorDellaretti Filho, Osmario, 1944-en_US
dc.contributor.authorDellaretti Filho, Osmario, 1944-en_US
dc.date.issued1981en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe behavior of gas-solid reactors known as compact-fixed and moving beds, is analyzed from a theoretical viewpoint. For a compact fixed-bed the solution of the energy balance equations is obtained for the cases of a uniform temperature inside the solid pellets (i.e., the Biot number is zero) and for the case in which there are temperature gradients within the pellets (Bi > 0). For short contact times, beds with Bi > 0 have gas- and solid- temperatures which are greater than the temperatures within beds with Bi = 0. For long times, the situation is reversed. For a compact-moving bed the solution of the mass balance equations is obtained for the cases of a feed-solid with constant concentration and a feed solid with an oscillating concentration. In both cases the steady states obtained are unique, and internal recycling is observed only for a feed-solid with an oscillating concentration. Recycling is that situation when the concentration of the solid falls below that of the gas for a bed in which the feed-solid is greater than the feed-gas. This occurred when the period of oscillation was smaller than the residence time of the solid provided that the residence time of the solid was not very short (i.e., provided that B(,s) > 0.1). For both types of beds there is an equivalence between mass transfer and energy transfer so that the solutions can be interchanged with suitable definitions of dimensionless variables.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectHeat -- Transmission -- Mathematical models.en_US
dc.subjectHeat-transfer media -- Mathematical models.en_US
dc.subjectGas cooled reactors.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineMetallurgical engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorPoirier, David R.en_US
dc.contributor.advisorGeiger, Gordon H.en_US
dc.identifier.proquest8120721en_US
dc.identifier.oclc8724737en_US
dc.identifier.bibrecord.b13921940en_US
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