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Espanhol para fins específicos no ensino superior tecnológico e formação docente: articulações, rumos e possibilidades / Spanish for specific purposes in the technological higher education and teacher training: connections, directions and possibilitiesBedin, Maria Camila 19 May 2017 (has links)
A formação de docentes de línguas estrangeiras (LE) já foi tema de muitos estudos, livros, capítulos e artigos. Porém, tratar da formação desses profissionais no concernente ao ensino de espanhol1 para fins específicos ainda é palco para poucos atores. No intuito de fazer parte desse seleto elenco e impulsionadas pela nossa prática nos cursos superiores de tecnologia, propusemo-nos investigar essa realidade. Nosso interesse centrou-se na formação e atuação dos professores de espanhol que trabalham no ensino superior tecnológico, em uma instituição pública no estado de São Paulo, nos cursos de Eventos, Gestão de Recursos Humanos, Gestão de Turismo e Secretariado. Tratamos, assim, de conhecer a formação e desempenho desses professores em sala de aula para verificar as relações, consistências e eventuais inconsistências entre concepções, princípios teóricos e metodológicos adotados no tocante ao ensino de línguas para fins específicos Elfe e sua implementação em sala de aula. Buscamos, ainda, apurar se a escassez de disciplinas e/ou discussões em cursos de graduação assim como de linhas de pesquisa que contemplem temas atinentes a esse ensino nos programas de pós-graduação no Brasil contribui para o surgimento e consolidação de uma lacuna na formação e o quanto isso influencia ou dificulta sua prática nesse contexto. Nosso estudo revelou haver um despreparo dos professores de espanhol no campo de Elfe, o qual inferimos ser reflexo da mencionada lacuna em sua formação. Nossa trajetória investigativa sobre o ensino nessa área pautou-se nos escritos de Dudley-Evans e St. John (1998), Hutchinson e Waters (1987), Robinson (1991), Swales (1988), Almeida Filho (2014 e 2016), Celani (1981, 2009) e Ramos (2001, 2004, 200 e 2012). Em relação à análise de necessidades baseamonos igualmente em Dudley-Evans e St. John (1998), Hutchinson e Waters (1987), mas também consideramos os trabalhos de Long (2005) e Widdowson (1978). Sobre as questões atinentes aos conceitos de abordagem, método, metodologia e técnicas nos apoiamos em estudos de especialistas como Almeida Filho (2010, 2012 e 2014), Anthony (1963) e Prabhu (1990). Este trabalho, de cunho qualitativo, configura-se como estudo de caso e a coleta de dados valeu-se de dois instrumentos: observações de aulas e realização de entrevistas semiestruturadas com diretores, coordenadores e docentes de língua espanhola. Dada a lacuna detectada na formação dos docentes investigados, confirmamos nossa hipótese de ela estar atrelada ao escasso oferecimento de linhas de pesquisa na área de línguas para fins específicos LinFE nos cursos de pós-graduação nas universidades brasileiras e a carência de discussões e de disciplinas nos cursos de Licenciatura em Letras. As discussões e reflexões realizadas permitiram-nos apresentar contribuições tanto para o âmbito acadêmico e profissional quanto para a formação docente e ensejamos fortemente que esta investigação abra novos caminhos aos professores de LEs que pretendem iniciar e/ou aperfeiçoar seu conhecimento no campo do ensino de LinFE, promovendo articulações, definindo rumos e sinalizando possibilidades para o desenvolvimento dessa área no Brasil. / Training of foreign language teachers has already been the subject of many studies, books, chapters and articles. However, dealing with the training of these professionals regarding Spanish for specific purposes teaching is still a stage for a few actors. In order to be part of this select cast and driven by our practice with the teaching of this language in higher education technology courses, we aimed to investigate this reality. Our interest was focused on the training and practice of Spanish teachers from technological higher education at a public college in São Paulo state, in the courses of Events, Human Resources Management, Secretariat and Turism Management. Thus, we sought to know about the formation and classroom performance of these teachers in order to check the relations, consistencies and eventual inconsistencies between conceptions and theoretical and methodological principles adopted in the teaching of languages for specific purposes - Elfe - and its implementation in classroom. We also attempted to ascertain whether the shortage of courses and / or discussions in undergraduate programs as well as the lack of research lines involving subjects related to this teaching in the graduate programs in Brazil contributes to the emergence and consolidation of a gap in the training of foreign language teachers working in these areas and how much this influences or hinders their practice in this context. This study revealed that there is a lack of preparation of Spanish teachers in the Elfe field, which we inferred to be a reflection of the aforementioned gap in their formation. Our investigative course on the teaching of LSP (Language for Specific Purposes) was based on the writings of Dudley-Evans and St. John (1998), Hutchinson and Waters (1987), Robinson (1991) and Swales (1988). In relation to the needs analysis we are also based on Dudley-Evans and St. John (1998), Hutchinson and Waters (1987), but we also consider the works of Long (2005) and Widdowson (1978). Regarding the issues related to the concepts of approach, method, methodology and techniques, we take as supporting studies the works of experts such as Almeida Filho (2010, 2012 and 2014), Anthony (1963) and Prabhu (1990). This qualitative research sets to be a case study and its data collection was based on two instruments: class observations and semistructured interviews with directors, coordinators and Spanish-speaking teachers of the investigated Higher Education College. Due to the failure detected in the training of the investigated teachers, we confirm our hypothesis in which it is linked to the scarce provision of research lines in the area of LSP in graduate courses in Brazilian universities. The performed discussions and considerations allowed to present contributions both for the academic and professional scope as well as for the teacher training. We strongly encourage this research to open new paths for foreign language teachers who intend to initiate or improve their knowledge in the field of LSP teaching, articulating, directing and signaling possibilities for the development of this area in Brazil.
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Memórias de uma formação cidadã, Escola Estadual Dr. Reynaldo Kuntz Busc - 1965 a 1978. / State School "Reynaldo Kuntz Busch" and its memoirs of civic education, 1965 a 1978.Anjos, Silvio Luis dos 27 February 2015 (has links)
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Previous issue date: 2015-02-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The subject of this dissertation refers to the analysis of the experience of studying at the State School "Reynaldo Kuntz Busch", located in Praia Grande, on the coast of São Paulo, Brazil, between 1965, when the school was first opened, and 1978, when I finished High School as a regular student. This paper has, as its core, the aim to investigate how much and in what ways this school, within the proposed time frame, favored an authentic citizen education tied to Human Rights to its students, in a period through which the country was under military dictatorship, having severe restrictions to civilian and political rights being imposed upon its citizens. The research focused on qualitative approach, based on bibliographical research, document analysis and interviews with players who participated both directly and indirectly on the school daily routine. In that sense, the investigation sought: 1) To address a perspective on the citizenship concept to related Human Rights and its relevance within a context of specific school education; 2) To analyze the movement for Praia Grande-s municipal emancipation from its neighboring town, São Vicente, which happened simultaneously to the fight for the creation of a school that would offer Junior High School studies, which were non-existent at that time. 3) To get testimonials from players who were involved in the school history during the time frame in this research paper. 4) To develop categories for analysis which aim at relating and analyzing deeply the idea of education for citizenship, with school practices being witnessed or perceived at the Reynaldo school during the period under study. Documental sources related to the time period and theoretical references are described throughout the paper. During the research, we identified elements which can be seen as key for educational citizenship connected to Human Rights, experienced by the students at the State School Reynaldo Kuntz Busch since its creation, in 1965,until 1978. / O tema da dissertação refere-se à análise da experiência vivenciada na Escola Estadual "Reynaldo Kuntz Busch", sediada no município de Praia Grande, litoral de São Paulo, no período de 1965 (ano de sua instalação) até o final do ano de 1978 (ano em que, como aluno, concluí o Ensino Médio na referida Escola). Este estudo tem como foco central verificar o quanto e de que forma essa escola no período em tela, favoreceu uma autêntica formação cidadã vinculada aos Direitos Humanos, aos seus alunos, em um período de ditadura militar e severas restrições ao exercício de direitos civis e políticos. A investigação se deu a partir de um enfoque qualitativo de investigação, pautado por uma pesquisa bibliográfica, análise documental e entrevistas com atores que participaram direta e indiretamente do cotidiano dessa escola. Nesse sentido a pesquisa procurou: 1) Abordar uma perspectiva do conceito de cidadania relacionada aos Direitos Humanos e sua relevância no contexto de uma formação escolar específica; 2) Analisar o movimento de emancipação do município de Praia Grande, que aconteceu concomitantemente à luta para a criação de uma escola que oferecesse no município o ciclo secundário até então inexistente; 3) Buscar depoimentos de atores envolvidos com a história da escola no período que é objeto desta pesquisa; 4) Desenvolver categorias de análise que busquem relacionar e analisar minimamente a idéia de uma formação para cidadania com práticas escolares presenciadas e/ou percebidas no ¿Kuntz¿ no período em tela. Estão descritas ao longo da pesquisa as fontes documentais encontradas dentro do período mencionado além do referencial teórico. No decorrer da pesquisa, verificou-se elementos importantes daquilo que se poderia classificar como uma formação para a cidadania atrelada aos Direitos Humanos, vivenciados pela Escola Estadual ¿Dr. Reynaldo Kuntz Busch¿ desde sua criação em 1965 até o ano de 1978.
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O planejamento estratégico: um estudo em uma organização civil do Rio Grande do SulPostingher, Paulo Sérgio 30 June 2014 (has links)
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Previous issue date: 2014-06-30 / Nenhuma / Este trabalho teve como objetivo descrever os principais desafios e dificuldades enfrentadas no processo de implantação do planejamento estratégico no Centro de Educação Profissional São João Calábria, organização sem fins lucrativos de Porto Alegre no Rio Grande do Sul de acordo com a perspectiva dos seus principais gestores. Além de descrever e analisar os desafios e dificuldades enfrentadas no processo de implantação, também buscou demonstrar alguns de seus resultados. A pesquisa contemplou analisar o processo de adoção da técnica do planejamento estratégico, enfatizando a sua motivação, a forma de implementação, o grau de participação decisória dos membros não-gestores nesse processo, a sua estratégia na orientação das ações sociais típicas do terceiro setor nesta entidade profissional e voluntária e também avaliar os resultados alcançados pela organização após a implementação do planejamento estratégico. Foi realizada uma revisão da literatura sobre estratégia, gestão estratégica, planejamento estratégico e implementação do planejamento estratégico. A natureza da metodologia foi qualitativa, quanto aos fins, tratou-se de um estudo de campo descritivo, e quanto ao meio, um estudo de caso, pois se objetiva verificar o planejamento e a estratégia adotada e implementada na perspectiva dos gestores desta organização. Foram entrevistados sete gestores do Conselho operacional da organização, um gestor da Congregação dos Pobres Servos da Divina Providência e outros cinco colaboradores das atividades operacionais e de apoio. Os resultados revelam que o planejamento trouxe muitos benefícios e um crescimento da organização nos últimos dez anos, desde quando foi implantado. Também revelou que apesar do crescimento existem algumas lacunas que devem ser melhoradas para melhorar a vida dos colaboradores e dos beneficiários. O estudo ajudou a ter uma visão diferente das organizações de terceiro setor, que, muitas vezes, são avessas a ferramentas de gestão e de planejamento, pois os gestores confundem questões sociais com a sobrevivência, esquecendo de planejar e pensar as suas estratégias. / This paper aims to describe the implementation process of strategic planning at the Centro de Educação Profissional São João Calábria, a nonprofit organization in Porto Alegre, Rio Grande do Sul, according to the perspective of its key managers. Besides analyzing this implementation process, it also seeks to show the results from it. For this research we analyzed the process of adopting the technique of strategic planning, highlighting its motivation, its way of implementation, the level of decisional participation of the non-managing members in this process, the strategy applied to guide the typical social actions of the third sector in this professional and voluntary institution, and we also evaluated the results achieved by the organization after the implementation of the strategic planning process. A literature review was conducted on strategy, strategic management, strategic planning and its implementation. The research consists of a case study with qualitative methodology applied to conduct a descriptive field study, since its aim is to verify the planning and strategy adopted and implemented in the perspective of managers of this organization. We interviewed seven members of the Operational Management Team in the organization, one manager of Congregação dos Pobres Servos da Divina Providência (Congregation of the Poor Servants of the Divine Providence) and five other subjects involved in the operational and support activities. The results show that planning has brought many benefits and growth to the organization over the past decade, since it was implemented. The results also revealed that, despite the growth, there are some gaps that need to be improved to improve the lives of both employees and beneficiaries. This study helped to have a different view of third sector organizations, which are often averse to planning and management tools, because managers misunderstand social issues and survival, forgetting to plan and think about their strategies.
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O ensino do francês em contexto universitário através dos gêneros orais: uma experiência com estudantes de engenharia da Universidade de São Paulo / The teaching of French in the universitarian context through oral genres: an experience with engineering students of the University of São PauloHirakawa, Daniela Akie 15 September 2014 (has links)
Essa pesquisa foi conduzida em duas turmas do módulo Projetos em Francês do Curso de Francês para Iniciantes, que oferece aulas de francês para alunos da Escola Politécnica graças a uma parceria entre o Centro de Línguas da FFLCH-USP e a CRInt da Poli-USP. O objetivo de nosso trabalho era analisar e selecionar os gêneros orais apropriados no contexto de ensino do francês língua estrangeira para fins universitários, além de apresentar uma proposta de sequência didática em torno do gênero oral entrevista de trabalho.Para isso, partimos das orientações do Quadro Europeu Comum de Referência para as Línguas (QECR) e das propostas metodológicas de ensino do oral através dos gêneros elaboradas por Dolz & Schneuwly (1998). A aplicação das sequências didáticas do gênero entrevista de trabalho mostrou que o trabalho com os gêneros propicia a reflexão sobre os aspectos sociolinguísticos e pragmáticos do texto, além de favorecer a mobilização de estratégias e competências por parte dos aprendentes. / This research was conducted in different two groups of the Curso de Francês para Iniciantes, which provides French classes to students of the Escola Politécnica, thanks to a partnership between the Centro de Línguas FFLCH-USP and the CRInt-Poli-USP. The goal of this work was to analyze and select the oral genres appropriated in the context of French for Academic Purposes and to present a didactic sequence for the genre job interview. In order to do that, we chose the orientations of the Common European Framework of Reference and the methodological proposals elaborated by Dolz & Schneuwly (1998) for the oral genres teaching. The results showed that learners could benefit from the sociolinguistics and pragmatics aspects of the text, and from the strategies and competences they develop during the didactic sequence for the job interview.
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Análise de necessidades em um curso técnico integrado ao ensino médio em informática para internet /Neves, Cristiane das Neves das January 2019 (has links)
Orientador: Solange Aranha / Resumo: Os cursos de Ensino Médio Integrado (EMI) nos Institutos Federais têm uma natureza peculiar, uma vez que buscam formar o aluno tanto no ensino regular propedêutico quanto na educação profissional técnica de nível médio. A aprendizagem de uma língua estrangeira nesta conjuntura pode ser inserida no contexto do ensino de Inglês para Fins Específicos – IFE ou ESP (BROWN, 2016; HYON, 2018; WOODROW, 2018). Em uma proposta de utilização do quadro teórico do IFE para elaboração de cursos no EMI, o objetivo principal desta tese é analisar as necessidades de uso da língua inglesa em dois contextos: o contexto profissional do desenvolvedor de sistemas de computadores e o contexto das aulas das disciplinas técnicas (do eixo tecnológico) do Curso Técnico em Informática para Internet (CTIEMII) do Campus Rio Branco do Instituto Federal do Acre (IFAC). A análise visa a identificação de elementos para a elaboração de uma proposta de programa de ensinoaprendizagem de língua inglesa baseado em gêneros, habilidades e atitudes requeridas na formação do jovem no ensino integrado que forma técnicos em desenvolvimento de sistemas para Web. De maneira específica, procura-se i) identificar, por meio da análise dos documentos norteadores nacionais, do projeto pedagógico de curso do CTIEMII do IFAC e do plano de ensino do componente curricular língua inglesa desse curso, a presença dos objetivos para a formação do educando; ii) identificar, por meio de análise de necessidades, mediante aplicação de que... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The Integrated High School (EMI) courses at the Federal Institutes in Brazil have a peculiar nature, since they aim at both regular secondary education and technical education at a secondary level. The learning of a foreign language in this context can be inserted in the area of English for Specific Purposes – ESP (IFE in Portuguese) (BROWN, 2016; HYON, 2018; WOODROW, 2018). The main objective of this thesis is to analyze the students’ needs of English language use in two contexts: the professional context of the computer system developer and the context of the classes (Technological axis) of the Technical Course in Web Development (CTIEMII) at the Rio Branco Campus of the Federal Institute of Acre (IFAC). The analysis aims at identifying elements which allow elaborating a proposal of an Englishlanguage teaching program based on genres, skills and attitudes required in the education of the youngs at the integrated course for Web development technicians. The objectives are specifically, i) to identify, through the analysis of the national documents, the pedagogical project of the CTIEMII at IFAC and the teaching plan of the English language subject, the presence of the objectives for the student education; ii) to identify, through the needs analysis, with the application of questionnaires and interviews with professionals, coordinators, teachers and students, aspects of the use of the English language that are necessary to the students' performance in the technical subjects of... (Complete abstract click electronic access below) / Doutor
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Nouvelles approximations numériques pour les équations de Stokes et l'équation Level SetMalcom, Djenno Ngomanda 14 December 2007 (has links) (PDF)
Ce travail de thèse est consacré à deux thèmes de recherche en Calcul Scientifique liés par l'approximation numérique de problèmes en mécanique des fluides. Le premier thème concerne l'approximation numérique des équations de Stokes, modélisant les écoulements de fluides incompressibles à vitesse faible. Ce thème est présent dans plusieurs travaux en Calcul Scientifique. La discrétisation en temps est réalisée à l'aide de la méthode de projection. La discrétisation en espace utilise la méthode des éléments finis mixtes hybrides qui permet d'imposer de façon exacte la contrainte d'incompressibilité. Cette approche est originale: la méthode des éléments mixtes hybrides est couplée avec une méthode d'éléments finis standards. L'ordre de convergence des deux méthodes est préservé. Le second thème concerne la mise au point de méthodes numériques de type volumes finis pour la résolution de l'équation Level Set. Ces équations interviennent de manière essentielle dans la résolution des problèmes de propagation d'interfaces. Dans cette partie, nous avons développé une nouvelle méthode d'ordre 2 de type MUSCL pour résoudre le système hyperbolique résultant de l'équation Level Set. Nous illustrons ces propriétés par des applications numériques. En particulier nous avons regardé le cas du problème des deux demi-plans pour lequel notre schéma donne une approximation pour le gradient de la fonction Level Set. Par ailleurs, l'ordre de précision attendu est obtenu avec les normes $L_1$ et $L_{\infty}$ pour des fonctions régulières. Pour finir, il est à noter que notre méthode peut être facilement étendue aux problèmes d'Hamilton-Jacobi du premier et du second ordre.
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Influence des procédés papetiers et des variations saisonnières sur la structure des fibres – relation avec les propriétés mécaniques des papiersChevalier-Billosta, Valérie 20 March 2008 (has links) (PDF)
L'objectif de cette étude était de comprendre l'influence des saisons sur la variabilité des propriétés mécaniques des papiers recyclés impliquant l'adjonction de charges en amidon importantes, phénomène ayant des répercussions économiques et environnementales défavorables. Plusieurs voies de recherche ont été explorées comme les conditions de stockage des papiers récupérés après collecte, l'influence des températures des eaux de circuit et l'influence du taux et du type d'éléments fins.<br />Pour atteindre ces objectifs, plusieurs outils permettant une observation à l'échelle de la microfibrille de cellulose (10nm) ont été développés ou adaptés (coloration, immunomarquage, PATAg, marquage fluorescent...) couplés à des techniques de microscopie conventionnelle (optique, transmission, balayage, confocal...) afin de mieux comprendre les modifications de la micromorphologie et de l'ultrastructure des fibres en fonction des différents traitements appliqués et d'établir des corrélations avec les variations des propriétés mécaniques des papiers correspondants. Des techniques d'analyse des fibres de bois et de ses composants ont également été utilisées afin d'étudier la morphologie des fibres (analyseur MorFi) ainsi que d'évaluer de manière plus quantitative leurs différents composants (analyse des sucres, chromatographie en phase gazeuse, 13C RMN). La première partie du projet a permis de mettre en place une démarche méthodologique permettant de corréler les observations au niveau ultrastructural et morphologique des fibres et les propriétés mécaniques des papiers fabriqués à partir de celles-ci. L'application de cette méthode nous a permis dans un second temps de montrer que les papiers récupérés par la collecte devaient être stockés de manière plus protégée en hiver par les centres de tri. De même, nous avons pu mettre en évidence la nécessité de réfrigérer les eaux de circuit dans la machine à papier lorsque la fabrication a lieu en été. Enfin, le dernier chapitre a souligné, par la mise en place d'une nouvelle méthode de marquage (PARA-Gold), le fait que le recyclage entraîne la production d'éléments fins aux propriétés de liaison aux fibres diminuées et des solutions pour réactiver ces derniers ont été proposées aux papetiers.
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Study of Laminar Flow Forced Convection Heat Transfer Behavior of a Phase Change Material FluidRavi, Gurunarayana 14 January 2010 (has links)
The heat transfer behavior of phase change material fluid under laminar flow conditions in circular tubes and internally longitudinal finned tubes are presented in this study. Two types of boundary conditions, including uniform axial heat flux with constant peripheral temperature and uniform axial and peripheral temperature, were considered in the case of circular tubes. An effective specific heat technique was used to model the phase change process assuming a hydrodynamically fully-developed flow at the entrance of the tube. Results were also obtained for the phase change process under hydro dynamically and thermally fully developed conditions. In case of a smooth circular tube with phase change material (PCM) fluid, results of Nusselt number were obtained by varying the bulk Stefan number. The Nusselt number results were found to be strongly dependent on the Stefan number. In the case of a finned tube two types of boundary conditions were studied. The first boundary condition had a uniform axial heat flux along the axis of the tube with a variable temperature on the peripheral surface of the tube. The second boundary condition had a constant temperature on the outer surface of the tube. The effective specific heat technique was again implemented to analyze the phase change process under both the boundary conditions. The Nusselt number was determined for a tube with two fins with different fin height ratios and fin thermal conductivity values. It was determined that the Nusselt number was strongly dependent on the Stefan number, fin thermal conductivity value, and height of the fins. It was also observed that for a constant heat axial flux boundary condition with peripherally varying temperature, the phase change slurry with the internally finned tube performed better than the one without fins. A similar trend was observed during the phase change process with internal fins under the constant wall temperature boundary condition.
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Paramétrisation et transfert d'animations faciales 3D à partir de séquences vidéo : vers des applications en temps réelDutreve, Ludovic 24 March 2011 (has links) (PDF)
L'animation faciale est l'un des points clés dans le réalisme des scènes 3D qui mettent en scène des personnages virtuels. Ceci s'explique principalement par les raisons suivantes : le visage et les nombreux muscles qui le composent permettent de générer une multitude d'expressions ; ensuite, notre faculté de perception nous permet de détecter et d'analyser ses mouvements les plus fins. La complexité de ce domaine se retrouve dans les approches existantes par le fait qu'il est très difficile de créer une animation de qualité sans un travail manuel long et fastidieux. Partant de ce constat, cette thèse a pour but de développer des techniques qui contribuent au processus de création d'animations faciales. Trois thèmes sont principalement abordés. Le premier concerne la paramétrisation du visage pour l'animation. La paramétrisation a pour but de définir des moyens de contrôle pour pouvoir déformer et animer le visage. Le second s'oriente sur l'animation, et plus particulièrement sur le transfert d'animation. Le but est de proposer une méthode qui permette d'animer le visage d'un personnage à partir de données variées. Ces données peuvent être issues d'un système de capture de mouvement, ou bien elles peuvent être obtenues à partir de l'animation d'un personnage virtuel qui existe déjà. Enfin, nous nous sommes concentrés sur les détails fins liés à l'animation comme les rides. Bien que ces rides soient fines et discrètes, ces déformations jouent un rôle important dans la perception et l'analyse des émotions. C'est pourquoi nous proposons une technique d'acquisition mono-caméra et une méthode à base de poses références pour synthétiser dynamiquement les détails fins d'animation sur le visage. L'objectif principal des méthodes proposées est d'offrir des solutions afin de faciliter et d'améliorer le processus de création d'animations faciales réalistes utilisées dans le cadre d'applications en temps réel. Nous nous sommes particulièrement concentrés sur la facilité d'utilisation et sur la contrainte du temps réel. De plus, nous offrons la possibilité à l'utilisateur ou au graphiste d'interagir afin de personnaliser sa création et/ou d'améliorer les résultats obtenus
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Study of Laminar Flow Forced Convection Heat Transfer Behavior of a Phase Change Material FluidRavi, Gurunarayana 14 January 2010 (has links)
The heat transfer behavior of phase change material fluid under laminar flow conditions in circular tubes and internally longitudinal finned tubes are presented in this study. Two types of boundary conditions, including uniform axial heat flux with constant peripheral temperature and uniform axial and peripheral temperature, were considered in the case of circular tubes. An effective specific heat technique was used to model the phase change process assuming a hydrodynamically fully-developed flow at the entrance of the tube. Results were also obtained for the phase change process under hydro dynamically and thermally fully developed conditions. In case of a smooth circular tube with phase change material (PCM) fluid, results of Nusselt number were obtained by varying the bulk Stefan number. The Nusselt number results were found to be strongly dependent on the Stefan number. In the case of a finned tube two types of boundary conditions were studied. The first boundary condition had a uniform axial heat flux along the axis of the tube with a variable temperature on the peripheral surface of the tube. The second boundary condition had a constant temperature on the outer surface of the tube. The effective specific heat technique was again implemented to analyze the phase change process under both the boundary conditions. The Nusselt number was determined for a tube with two fins with different fin height ratios and fin thermal conductivity values. It was determined that the Nusselt number was strongly dependent on the Stefan number, fin thermal conductivity value, and height of the fins. It was also observed that for a constant heat axial flux boundary condition with peripherally varying temperature, the phase change slurry with the internally finned tube performed better than the one without fins. A similar trend was observed during the phase change process with internal fins under the constant wall temperature boundary condition.
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