{"id":{"repo_id":"brazil-uerj","oai_identifier":"oai:pantheon.ufrj.br:11422/5989"},"canonical_url":"https://search.dev.ndltd.org/etd/brazil-uerj/oai:pantheon.ufrj.br:11422/5989","repository":{"repo_id":"brazil-uerj","name":"Brazil UERJ","base_url":"https://pantheon.ufrj.br/oai/request"},"display":{"title":"Análise de problemas conjugados em microssistemas térmicos com múltiplas correntes e geometrias complexas via transformação integral","abstract":"A numerical-analytical hybrid solution is presented through the Generalized Integral Transformation Technique (GITT) using a single-domain reformulation with a total transformation scheme for problems of conjugated heat transfer in thermal micro-systems with flows of immiscible fluids in direct contact, multiple currents and microchannels of complex geometric configurations. The GITT is used in combination with a strategy to reformulate the problem in a single domain, through coefficients with spatial variation introduced in the energy equation, that allow to unify the formulations in the solid and fluid regions. Convergence acceleration alternatives of the expansions in autofunctions are analyzed, including the rearrangement of the terms in the expansion based on the diagonal of the matrix of coefficients of the transformed system and the use of recursive filters in the solution. Both showed a significant improvement in the convergence of the results, besides a good comparison with numerical results obtained through the COMSOL commercial platform.","abstract_html":"A numerical-analytical hybrid solution is presented through the Generalized Integral Transformation Technique (GITT) using a single-domain reformulation with a total transformation scheme for problems of conjugated heat transfer in thermal micro-systems with flows of immiscible fluids in direct contact, multiple currents and microchannels of complex geometric configurations. The GITT is used in combination with a strategy to reformulate the problem in a single domain, through coefficients with spatial variation introduced in the energy equation, that allow to unify the formulations in the solid and fluid regions. Convergence acceleration alternatives of the expansions in autofunctions are analyzed, including the rearrangement of the terms in the expansion based on the diagonal of the matrix of coefficients of the transformed system and the use of recursive filters in the solution. Both showed a significant improvement in the convergence of the results, besides a good comparison with numerical results obtained through the COMSOL commercial platform.","abstract_has_math":false,"creators":["Zotin, José Luiz Zanon"],"institution":"Universidade Federal do Rio de Janeiro","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Cotta, Renato Machado"],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-04","date_published":"2017-04","updated_at":"2026-07-24T01:16:18Z","subjects":["Análise numérica","Equações diferenciais parciais","Microcanais"],"languages":["por"],"rights":["Acesso Aberto"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11422/5989","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Cotta, Renato Machado"]},{"key":"dc:creator","label":"Author","values":["Zotin, José Luiz Zanon"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-12-14T16:33:01Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-05-16T03:03:23Z"]},{"key":"dc:date.issued","label":"Date","values":["2017-04"]},{"key":"dc:publisher","label":"Institution","values":["Universidade Federal do Rio de Janeiro"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"]},{"key":"dc:type","label":"Dc Type","values":["Tese"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Análise numérica","Equações diferenciais parciais","Microcanais"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["por"]},{"key":"dc:rights","label":"Dc Rights","values":["Acesso Aberto"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11422/5989"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A numerical-analytical hybrid solution is presented through the Generalized Integral Transformation Technique (GITT) using a single-domain reformulation with a total transformation scheme for problems of conjugated heat transfer in thermal micro-systems with flows of immiscible fluids in direct contact, multiple currents and microchannels of complex geometric configurations. The GITT is used in combination with a strategy to reformulate the problem in a single domain, through coefficients with spatial variation introduced in the energy equation, that allow to unify the formulations in the solid and fluid regions. Convergence acceleration alternatives of the expansions in autofunctions are analyzed, including the rearrangement of the terms in the expansion based on the diagonal of the matrix of coefficients of the transformed system and the use of recursive filters in the solution. Both showed a significant improvement in the convergence of the results, besides a good comparison with numerical results obtained through the COMSOL commercial platform."]},{"key":"dc:title","label":"Title","values":["Análise de problemas conjugados em microssistemas térmicos com múltiplas correntes e geometrias complexas via transformação integral"]}]}],"canonical_facts":{"dc:contributor.advisor":["Cotta, Renato Machado"],"dc:creator":["Zotin, José Luiz Zanon"],"dc:date.accessioned":["2018-12-14T16:33:01Z"],"dc:date.available":["2026-05-16T03:03:23Z"],"dc:date.issued":["2017-04"],"dc:description.abstract":["A numerical-analytical hybrid solution is presented through the Generalized Integral Transformation Technique (GITT) using a single-domain reformulation with a total transformation scheme for problems of conjugated heat transfer in thermal micro-systems with flows of immiscible fluids in direct contact, multiple currents and microchannels of complex geometric configurations. The GITT is used in combination with a strategy to reformulate the problem in a single domain, through coefficients with spatial variation introduced in the energy equation, that allow to unify the formulations in the solid and fluid regions. Convergence acceleration alternatives of the expansions in autofunctions are analyzed, including the rearrangement of the terms in the expansion based on the diagonal of the matrix of coefficients of the transformed system and the use of recursive filters in the solution. Both showed a significant improvement in the convergence of the results, besides a good comparison with numerical results obtained through the COMSOL commercial platform."],"dc:identifier.uri":["http://hdl.handle.net/11422/5989"],"dc:language":["por"],"dc:publisher":["Universidade Federal do Rio de Janeiro"],"dc:publisher.department":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"],"dc:rights":["Acesso Aberto"],"dc:subject":["Análise numérica","Equações diferenciais parciais","Microcanais"],"dc:title":["Análise de problemas conjugados em microssistemas térmicos com múltiplas correntes e geometrias complexas via transformação integral"],"dc:type":["Tese"]},"updated_at":"2026-07-24T01:16:18Z"}