{"id":{"repo_id":"pretoria","oai_identifier":"oai:repository.up.ac.za:2263/27533"},"canonical_url":"https://search.dev.ndltd.org/etd/pretoria/oai:repository.up.ac.za:2263/27533","repository":{"repo_id":"pretoria","name":"University of Pretoria","base_url":"https://repository.up.ac.za/server/oai/request"},"display":{"title":"Bubbling to turbulent regime transition in a 2D catalytic fluidized bed reactor","abstract":"The ozone decomposition reaction was performed in a 2.5cmx40cmx450cm two dimensional (2D) catalytic fluidized bed reactor. Commercial FCC catalyst impregnated with Fe2O3 was used at superficial gas velocities ranging between 0.006 m/s and 0.55 m/s. The onset velocity of the turbulent regime (uc) was determined as 0.4 m/s. The catalyst activity was optimized so that the effect of inter-phase mass transfer could be accentuated in the conversion reading. It was found that the general bubbling-turbulent model of Thompson et. al. (1999) combined with the mass transfer correlations of Kunii and Levenspiel (1991), Foka et. al. (1996) and Miyauchi et. al. (1980)gave reasonable predictions of the experimental data. The gradual improvement of reactor performance with an increase in superficial velocity (as predicted by the Thompson et. al. model) was not observed; instead a discontinuity of the reactor performance was noted in the vicinity of uc. More experimental work is required to substantiate this observation. Copyright","abstract_html":"The ozone decomposition reaction was performed in a 2.5cmx40cmx450cm two dimensional (2D) catalytic fluidized bed reactor. Commercial FCC catalyst impregnated with Fe2O3 was used at superficial gas velocities ranging between 0.006 m/s and 0.55 m/s. The onset velocity of the turbulent regime (uc) was determined as 0.4 m/s. The catalyst activity was optimized so that the effect of inter-phase mass transfer could be accentuated in the conversion reading. It was found that the general bubbling-turbulent model of Thompson et. al. (1999) combined with the mass transfer correlations of Kunii and Levenspiel (1991), Foka et. al. (1996) and Miyauchi et. al. (1980)gave reasonable predictions of the experimental data. The gradual improvement of reactor performance with an increase in superficial velocity (as predicted by the Thompson et. al. model) was not observed; instead a discontinuity of the reactor performance was noted in the vicinity of uc. More experimental work is required to substantiate this observation. Copyright","abstract_has_math":false,"creators":[],"institution":"University of Pretoria","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Nicol, Willie"],"committee_chairs":[],"committee_members":[],"year":2009,"date_issued":"2009","date_published":"2009","updated_at":"2026-07-24T03:52:45Z","subjects":["Reactor models","Two-dimensional fluidized beds","Ozone decomposition reaction.","Bubbling-turbulent","UCTD"],"languages":[],"rights":["© 2009, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["E10/462/gm"],"render_values":[{"text":"E10/462/gm","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2263/27533","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Nicol, Willie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2013-09-07T11:44:26Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2010-08-25","2013-09-07T11:44:26Z"]},{"key":"dc:date.issued","label":"Date","values":["2009"]},{"key":"dc:publisher","label":"Institution","values":["University of Pretoria"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Reactor models","Two-dimensional fluidized beds","Ozone decomposition reaction.","Bubbling-turbulent","UCTD"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["© 2009, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["E10/462/gm"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/2263/27533"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Dissertation (MEng)--University of Pretoria, 2009."]},{"key":"dc:description.abstract","label":"Abstract","values":["The ozone decomposition reaction was performed in a 2.5cmx40cmx450cm two dimensional (2D) catalytic fluidized bed reactor. Commercial FCC catalyst impregnated with Fe2O3 was used at superficial gas velocities ranging between 0.006 m/s and 0.55 m/s. The onset velocity of the turbulent regime (uc) was determined as 0.4 m/s. The catalyst activity was optimized so that the effect of inter-phase mass transfer could be accentuated in the conversion reading. It was found that the general bubbling-turbulent model of Thompson et. al. (1999) combined with the mass transfer correlations of Kunii and Levenspiel (1991), Foka et. al. (1996) and Miyauchi et. al. (1980)gave reasonable predictions of the experimental data. The gradual improvement of reactor performance with an increase in superficial velocity (as predicted by the Thompson et. al. model) was not observed; instead a discontinuity of the reactor performance was noted in the vicinity of uc. More experimental work is required to substantiate this observation. Copyright"]},{"key":"dc:title","label":"Title","values":["Bubbling to turbulent regime transition in a 2D catalytic fluidized bed reactor"]}]}],"canonical_facts":{"dc:contributor.advisor":["Nicol, Willie"],"dc:date.accessioned":["2013-09-07T11:44:26Z"],"dc:date.available":["2010-08-25","2013-09-07T11:44:26Z"],"dc:date.issued":["2009"],"dc:description":["Dissertation (MEng)--University of Pretoria, 2009."],"dc:description.abstract":["The ozone decomposition reaction was performed in a 2.5cmx40cmx450cm two dimensional (2D) catalytic fluidized bed reactor. Commercial FCC catalyst impregnated with Fe2O3 was used at superficial gas velocities ranging between 0.006 m/s and 0.55 m/s. The onset velocity of the turbulent regime (uc) was determined as 0.4 m/s. The catalyst activity was optimized so that the effect of inter-phase mass transfer could be accentuated in the conversion reading. It was found that the general bubbling-turbulent model of Thompson et. al. (1999) combined with the mass transfer correlations of Kunii and Levenspiel (1991), Foka et. al. (1996) and Miyauchi et. al. (1980)gave reasonable predictions of the experimental data. The gradual improvement of reactor performance with an increase in superficial velocity (as predicted by the Thompson et. al. model) was not observed; instead a discontinuity of the reactor performance was noted in the vicinity of uc. More experimental work is required to substantiate this observation. Copyright"],"dc:identifier.other":["E10/462/gm"],"dc:identifier.uri":["http://hdl.handle.net/2263/27533"],"dc:publisher":["University of Pretoria"],"dc:rights":["© 2009, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria."],"dc:subject":["Reactor models","Two-dimensional fluidized beds","Ozone decomposition reaction.","Bubbling-turbulent","UCTD"],"dc:title":["Bubbling to turbulent regime transition in a 2D catalytic fluidized bed reactor"],"dc:type":["Dissertation"]},"updated_at":"2026-07-24T03:52:45Z"}