{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101760"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101760","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Modeling of multiphase turbulent flow in continuous casting of steel","abstract":"This thesis develops mathematical models of multiphase turbulent flow and investigates multiphase flow issues arising in the continuous casting process of steel through the application of the developed models. In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) wall or stopper tip is well known to decrease clogging and remove inclusions. Besides this intended gas injection, gas may be passively sucked into the system by negative pressure development inside of nozzles. The injected gas through these two paths is redistributed into small bubbles through complex gas redistribution processes, and the size distribution of the bubbles affects flow patterns as well as defect mechanisms in molds. Estimation of the exact amount of argon gas and size distribution of bubbles is crucial to optimize this multiphase flow manufacturing process for minimizing defects. In this thesis, existing multiphase flow models are reviewed first to model the multiphase flow issues discussed above. A new hybrid multiphase flow model Eulerian-Eulerian Discrete-Phase Model (EEDPM), which can estimate flow pattern and bubble interactions such as coalescence, breakup, shearing off and volumetric expansion is proposed. Also, a simple 1D pressure energy model is developed to estimate pressure distribution in multiphase flow systems with complex geometry. These newly developed models are applied to estimate the flow pattern associated with the locally time-varying bubble size distribution in the system. Parametric studies are implemented to understand effects of operating conditions on the bubble size distribution and the flow pattern. This work gives insights on mechanisms of bubble size evolution and furthermore, optimization of the continuous casting process with argon gas injection.","abstract_html":"This thesis develops mathematical models of multiphase turbulent flow and investigates multiphase flow issues arising in the continuous casting process of steel through the application of the developed models. In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) wall or stopper tip is well known to decrease clogging and remove inclusions. Besides this intended gas injection, gas may be passively sucked into the system by negative pressure development inside of nozzles. The injected gas through these two paths is redistributed into small bubbles through complex gas redistribution processes, and the size distribution of the bubbles affects flow patterns as well as defect mechanisms in molds. Estimation of the exact amount of argon gas and size distribution of bubbles is crucial to optimize this multiphase flow manufacturing process for minimizing defects. In this thesis, existing multiphase flow models are reviewed first to model the multiphase flow issues discussed above. A new hybrid multiphase flow model Eulerian-Eulerian Discrete-Phase Model (EEDPM), which can estimate flow pattern and bubble interactions such as coalescence, breakup, shearing off and volumetric expansion is proposed. Also, a simple 1D pressure energy model is developed to estimate pressure distribution in multiphase flow systems with complex geometry. These newly developed models are applied to estimate the flow pattern associated with the locally time-varying bubble size distribution in the system. Parametric studies are implemented to understand effects of operating conditions on the bubble size distribution and the flow pattern. This work gives insights on mechanisms of bubble size evolution and furthermore, optimization of the continuous casting process with argon gas injection.","abstract_has_math":false,"creators":["Yang, Hyunjin"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Thomas, Brian G.","Vanka, Surya P.","Ruzic, David N.","Smith, Kyle C.","Brooks, Caleb"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:45:32Z","date_published":"2018-09-27T16:45:32Z","updated_at":"2026-07-22T22:24:40Z","subjects":["BUBBLE SIZE DISTRIBUTION","COALESCENCE","BREAKUP","SHEARING OFF","VOLUMETRIC EXPANSION","ASPIRATION"],"languages":["en"],"rights":["Copyright 2018 Hyunjin Yang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101760","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Thomas, Brian G.","Vanka, Surya P.","Ruzic, David N.","Smith, Kyle C.","Brooks, Caleb"]},{"key":"dc:creator","label":"Author","values":["Yang, Hyunjin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:45:32Z","2020-09-28T09:15:22Z","2018-07-02","2018-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["BUBBLE SIZE DISTRIBUTION","COALESCENCE","BREAKUP","SHEARING OFF","VOLUMETRIC EXPANSION","ASPIRATION"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Hyunjin Yang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101760"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis develops mathematical models of multiphase turbulent flow and investigates multiphase flow issues arising in the continuous casting process of steel through the application of the developed models. In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) wall or stopper tip is well known to decrease clogging and remove inclusions. Besides this intended gas injection, gas may be passively sucked into the system by negative pressure development inside of nozzles. The injected gas through these two paths is redistributed into small bubbles through complex gas redistribution processes, and the size distribution of the bubbles affects flow patterns as well as defect mechanisms in molds. Estimation of the exact amount of argon gas and size distribution of bubbles is crucial to optimize this multiphase flow manufacturing process for minimizing defects. In this thesis, existing multiphase flow models are reviewed first to model the multiphase flow issues discussed above. A new hybrid multiphase flow model Eulerian-Eulerian Discrete-Phase Model (EEDPM), which can estimate flow pattern and bubble interactions such as coalescence, breakup, shearing off and volumetric expansion is proposed. Also, a simple 1D pressure energy model is developed to estimate pressure distribution in multiphase flow systems with complex geometry. These newly developed models are applied to estimate the flow pattern associated with the locally time-varying bubble size distribution in the system. Parametric studies are implemented to understand effects of operating conditions on the bubble size distribution and the flow pattern. This work gives insights on mechanisms of bubble size evolution and furthermore, optimization of the continuous casting process with argon gas injection.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2020-08-01","The student, Hyunjin Yang, accepted the attached license on 2018-06-19 at 07:35.","The student, Hyunjin Yang, submitted this Dissertation for approval on 2018-06-19 at 07:36.","This Dissertation was approved for publication on 2018-07-02 at 13:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12643 on 2018-09-27 at 11:33:19","Made available in DSpace on 2018-09-27T16:45:32Z (GMT). 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In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) wall or stopper tip is well known to decrease clogging and remove inclusions. Besides this intended gas injection, gas may be passively sucked into the system by negative pressure development inside of nozzles. The injected gas through these two paths is redistributed into small bubbles through complex gas redistribution processes, and the size distribution of the bubbles affects flow patterns as well as defect mechanisms in molds. Estimation of the exact amount of argon gas and size distribution of bubbles is crucial to optimize this multiphase flow manufacturing process for minimizing defects. In this thesis, existing multiphase flow models are reviewed first to model the multiphase flow issues discussed above. A new hybrid multiphase flow model Eulerian-Eulerian Discrete-Phase Model (EEDPM), which can estimate flow pattern and bubble interactions such as coalescence, breakup, shearing off and volumetric expansion is proposed. Also, a simple 1D pressure energy model is developed to estimate pressure distribution in multiphase flow systems with complex geometry. These newly developed models are applied to estimate the flow pattern associated with the locally time-varying bubble size distribution in the system. Parametric studies are implemented to understand effects of operating conditions on the bubble size distribution and the flow pattern. This work gives insights on mechanisms of bubble size evolution and furthermore, optimization of the continuous casting process with argon gas injection.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2020-08-01","The student, Hyunjin Yang, accepted the attached license on 2018-06-19 at 07:35.","The student, Hyunjin Yang, submitted this Dissertation for approval on 2018-06-19 at 07:36.","This Dissertation was approved for publication on 2018-07-02 at 13:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12643 on 2018-09-27 at 11:33:19","Made available in DSpace on 2018-09-27T16:45:32Z (GMT). No. of bitstreams: 2 YANG-DISSERTATION-2018.pdf: 9544014 bytes, checksum: db558ab6b9ecdb377b1b9f5e30c6b50d (MD5) LICENSE.txt: 4209 bytes, checksum: cbf3ed58d5f21ce33fa72ded31f0a2c7 (MD5) Previous issue date: 2018-07-02","Embargo set by: Seth Robbins for item 107860 Lift date: 2020-09-27T16:45:39Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 107860 Lift date: 2020-09-27T16:47:41Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 107860 on 2020-09-28T09:15:22Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101760"],"dc:language":["en"],"dc:rights":["Copyright 2018 Hyunjin Yang"],"dc:subject":["BUBBLE SIZE DISTRIBUTION","COALESCENCE","BREAKUP","SHEARING OFF","VOLUMETRIC EXPANSION","ASPIRATION"],"dc:title":["Modeling of multiphase turbulent flow in continuous casting of steel"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:40Z"}