{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20808"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20808","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"\"Thermal-burst modeling of a double-diffusive \"\"diffusive\"\" interface\"","abstract":"\"The operation of a double-diffusive \"\"diffusive\"\" interface may be characterized by three regimes: quasi-steady entraining (often called the variable regime), quasi-steady non-entraining (often called the constant regime), and transient. Using a thermal burst modeling approach, new models have been developed for the quasi-steady entraining regime and the transient regime. The thermal burst theory proposes that the interface boundary layers become unstable and periodically break away due to the differing component diffusion rates. The quasi-steady entraining model assumes a thin interface where each burst entrains fluid up to the limit of neutral buoyancy. This entrainment assumption fixes the flux ratio at one and predicts normalized flux rates which are in generally good agreement with experimental data. The transient model assumes a thick interface with independent boundaries. There is no entrainment, but the boundary is reestablished after each burst at the point of neutral buoyancy. This assumption allows the model to predict interface growth and erosion rates. The transient model has been implemented in a finite difference simulation which has been used to recreate interface growth and erosion observed in experiments lasting as long as two weeks.\"","abstract_html":""The operation of a double-diffusive ""diffusive"" interface may be characterized by three regimes: quasi-steady entraining (often called the variable regime), quasi-steady non-entraining (often called the constant regime), and transient. Using a thermal burst modeling approach, new models have been developed for the quasi-steady entraining regime and the transient regime. The thermal burst theory proposes that the interface boundary layers become unstable and periodically break away due to the differing component diffusion rates. The quasi-steady entraining model assumes a thin interface where each burst entrains fluid up to the limit of neutral buoyancy. This entrainment assumption fixes the flux ratio at one and predicts normalized flux rates which are in generally good agreement with experimental data. The transient model assumes a thick interface with independent boundaries. There is no entrainment, but the boundary is reestablished after each burst at the point of neutral buoyancy. This assumption allows the model to predict interface growth and erosion rates. The transient model has been implemented in a finite difference simulation which has been used to recreate interface growth and erosion observed in experiments lasting as long as two weeks."","abstract_has_math":false,"creators":["Witte, Michael James"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Newell, Ty A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:49:53Z","date_published":"2011-05-07T12:49:53Z","updated_at":"2026-07-22T22:25:16Z","subjects":["Engineering, Mechanical"],"languages":["eng"],"rights":["Copyright 1989 Witte, Michael James"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924972","(UMI)AAI8924972"],"render_values":[{"text":"AAI8924972","href":null,"code":true},{"text":"(UMI)AAI8924972","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20808","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Newell, Ty A."]},{"key":"dc:creator","label":"Author","values":["Witte, Michael James"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:49:53Z","10000-01-01","1989"]},{"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":["Engineering, Mechanical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Witte, Michael James"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924972","(UMI)AAI8924972","http://hdl.handle.net/2142/20808"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"The operation of a double-diffusive \"\"diffusive\"\" interface may be characterized by three regimes: quasi-steady entraining (often called the variable regime), quasi-steady non-entraining (often called the constant regime), and transient. Using a thermal burst modeling approach, new models have been developed for the quasi-steady entraining regime and the transient regime. The thermal burst theory proposes that the interface boundary layers become unstable and periodically break away due to the differing component diffusion rates. The quasi-steady entraining model assumes a thin interface where each burst entrains fluid up to the limit of neutral buoyancy. This entrainment assumption fixes the flux ratio at one and predicts normalized flux rates which are in generally good agreement with experimental data. The transient model assumes a thick interface with independent boundaries. There is no entrainment, but the boundary is reestablished after each burst at the point of neutral buoyancy. This assumption allows the model to predict interface growth and erosion rates. The transient model has been implemented in a finite difference simulation which has been used to recreate interface growth and erosion observed in experiments lasting as long as two weeks.\"","Made available in DSpace on 2011-05-07T12:49:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 8924972.pdf: 4333385 bytes, checksum: 9260a407c3baafeea1975b73f6864d2d (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:46:25Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:20:48-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["\"Thermal-burst modeling of a double-diffusive \"\"diffusive\"\" interface\""]}]}],"canonical_facts":{"dc:contributor":["Newell, Ty A."],"dc:creator":["Witte, Michael James"],"dc:date":["2011-05-07T12:49:53Z","10000-01-01","1989"],"dc:description":["\"The operation of a double-diffusive \"\"diffusive\"\" interface may be characterized by three regimes: quasi-steady entraining (often called the variable regime), quasi-steady non-entraining (often called the constant regime), and transient. Using a thermal burst modeling approach, new models have been developed for the quasi-steady entraining regime and the transient regime. The thermal burst theory proposes that the interface boundary layers become unstable and periodically break away due to the differing component diffusion rates. The quasi-steady entraining model assumes a thin interface where each burst entrains fluid up to the limit of neutral buoyancy. This entrainment assumption fixes the flux ratio at one and predicts normalized flux rates which are in generally good agreement with experimental data. The transient model assumes a thick interface with independent boundaries. There is no entrainment, but the boundary is reestablished after each burst at the point of neutral buoyancy. This assumption allows the model to predict interface growth and erosion rates. 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