{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/72875"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/72875","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Transient model of preheating a submerged entry nozzle","abstract":"Adequate preheating of the submerged entry nozzle (SEN) is important to avoid problems such as thermal cracks and skulling, and depends on torch configuration, fuel, SEN geometry and other factors. A steady-state axisymmetric computational model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process. The model predictions match with experimental measurements of preheating with a natural-gas torch, including temperature profile across the flame, temperature histories measured inside the SEN wall, the flame shape, and the SEN outer wall temperature distribution. A Simple spread-sheet models is introduced to predict approximate flame temperature, heat transfer coefficients thermal properties, and SEN temperatures during preheating, given the air entrainment predicted from the 2D Combustion Model. Another spread-sheet model predicts SEN wall temperature histories during preheating, cool-down, and casting processes, with different temperature-dependent SEN material properties, geometries, initial conditions, and boundary conditions. The results reveal the times required to reach adequate preheating temperature and thermal patterns during each process. A parametric study of combustion during preheating found that positioning the torch at a proper distance above the SEN top, including an insulation layer and increasing refractory conductivity all increase SEN temperature and shorten preheating time.","abstract_html":"Adequate preheating of the submerged entry nozzle (SEN) is important to avoid problems such as thermal cracks and skulling, and depends on torch configuration, fuel, SEN geometry and other factors. A steady-state axisymmetric computational model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process. The model predictions match with experimental measurements of preheating with a natural-gas torch, including temperature profile across the flame, temperature histories measured inside the SEN wall, the flame shape, and the SEN outer wall temperature distribution. A Simple spread-sheet models is introduced to predict approximate flame temperature, heat transfer coefficients thermal properties, and SEN temperatures during preheating, given the air entrainment predicted from the 2D Combustion Model. Another spread-sheet model predicts SEN wall temperature histories during preheating, cool-down, and casting processes, with different temperature-dependent SEN material properties, geometries, initial conditions, and boundary conditions. The results reveal the times required to reach adequate preheating temperature and thermal patterns during each process. A parametric study of combustion during preheating found that positioning the torch at a proper distance above the SEN top, including an insulation layer and increasing refractory conductivity all increase SEN temperature and shorten preheating time.","abstract_has_math":false,"creators":["Li, Yonghui"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Thomas, Brian G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-01-21T19:49:05Z","date_published":"2015-01-21T19:49:05Z","updated_at":"2026-07-22T22:26:07Z","subjects":["Fuel component","Preheating","Nozzle","Refractory","Combustion","Torch configuration","Flame temperature","Thermal conductivity","Insulation","Visual Basic Application (VBA)","Heat Conduction"],"languages":["en"],"rights":["Copyright 2014 Yonghui Li"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/72875","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Thomas, Brian G."]},{"key":"dc:creator","label":"Author","values":["Li, Yonghui"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-01-21T19:49:05Z","2014-12","2015-01-21"]},{"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":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["Fuel component","Preheating","Nozzle","Refractory","Combustion","Torch configuration","Flame temperature","Thermal conductivity","Insulation","Visual Basic Application (VBA)","Heat Conduction"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2014 Yonghui Li"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/72875"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Adequate preheating of the submerged entry nozzle (SEN) is important to avoid problems such as thermal cracks and skulling, and depends on torch configuration, fuel, SEN geometry and other factors. A steady-state axisymmetric computational model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process. The model predictions match with experimental measurements of preheating with a natural-gas torch, including temperature profile across the flame, temperature histories measured inside the SEN wall, the flame shape, and the SEN outer wall temperature distribution. A Simple spread-sheet models is introduced to predict approximate flame temperature, heat transfer coefficients thermal properties, and SEN temperatures during preheating, given the air entrainment predicted from the 2D Combustion Model. Another spread-sheet model predicts SEN wall temperature histories during preheating, cool-down, and casting processes, with different temperature-dependent SEN material properties, geometries, initial conditions, and boundary conditions. The results reveal the times required to reach adequate preheating temperature and thermal patterns during each process. A parametric study of combustion during preheating found that positioning the torch at a proper distance above the SEN top, including an insulation layer and increasing refractory conductivity all increase SEN temperature and shorten preheating time.","Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-07-22T12:42:28Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Li_Yonghui.docx: 9743384 bytes, checksum: 3e82999604fa90b08c07e39e235dd1aa (MD5) Li_Yonghui.pdf: 4050807 bytes, checksum: 7bf2db86136fabd385ee4e35ecb161d1 (MD5)","Made available in DSpace on 2015-01-21T19:49:05Z (GMT). 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The model predictions match with experimental measurements of preheating with a natural-gas torch, including temperature profile across the flame, temperature histories measured inside the SEN wall, the flame shape, and the SEN outer wall temperature distribution. A Simple spread-sheet models is introduced to predict approximate flame temperature, heat transfer coefficients thermal properties, and SEN temperatures during preheating, given the air entrainment predicted from the 2D Combustion Model. Another spread-sheet model predicts SEN wall temperature histories during preheating, cool-down, and casting processes, with different temperature-dependent SEN material properties, geometries, initial conditions, and boundary conditions. The results reveal the times required to reach adequate preheating temperature and thermal patterns during each process. A parametric study of combustion during preheating found that positioning the torch at a proper distance above the SEN top, including an insulation layer and increasing refractory conductivity all increase SEN temperature and shorten preheating time.","Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-07-22T12:42:28Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Li_Yonghui.docx: 9743384 bytes, checksum: 3e82999604fa90b08c07e39e235dd1aa (MD5) Li_Yonghui.pdf: 4050807 bytes, checksum: 7bf2db86136fabd385ee4e35ecb161d1 (MD5)","Made available in DSpace on 2015-01-21T19:49:05Z (GMT). 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