Orientador: Carlos Teofilo Salinas Sedano / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-27T04:21:17Z (GMT). No. of bitstreams: 1 Armengol_JanMateu_M.pdf: 6999606 bytes, checksum: e35806586b55eb3f8f1b370625009ba8 (MD5) Previous issue date: 2015 / Resumo: Neste trabalho é apresentado um modelo para a formação de gelo poroso entre placas planas paralelas baseado em um novo tratamento bidimensional da taxa de crescimento. O modelo considera as equações de transporte de quantidade de movimento, energia e massa. Para a resolução do modelo, as equações são discretizadas usando o método de volumes finitos em um domínio bidimensional composto por ar e gelo poroso. A interface móvel ar-gelo é tratada utilizando a formulação de malha fixa. O domínio computacional inclui a região frontal das placas planas com a finalidade de estudar o crescimento do gelo poroso nessa região. O código numérico é verificado por partes de acordo com artigos de referência na literatura e o modelo é validado com dados experimentais. Os dados experimentais, reportando temperatura e crescimento de forma locais, coincidem com os resultados numéricos com um erro relativo inferior a 10 \% para o caso intermediário de taxa de umidade / Abstract: In this study, a frost formation model is presented based on a new two-dimensional approach for the growth rate. For modeling the frost formation over parallel cold plates, the basic transport equations of mass, energy and momentum have been discretized using the finite volume method in a two-dimensional domain in which air and frost are considered. A volume tracking method employing a fixed grid formulation is used to deal with the air-frost moving boundary. An extended domain in the inlet boundary has been considered in order to study the frost formation in the leading edge of the plate. The numerical code is gradually verified using benchmarking references. The numerical results have been validated against experimental data in which frost growth and temperature as a function of time are reported as local values. The model predictions of the frost thickness as a function of time agree with the experimental data within 10 \% of deviation for the case of intermediate humidity ratio / Mestrado / Termica e Fluidos / Mestre em Engenharia Mecânica

This thesis considers three British novels of the 1880s that imagined a range of middle-class domestic configurations that deviated in new ways from the long-contested fiction of the British household as a patriarchal stronghold. Although mid-Victorian novels very often featured narratives of domestic upheaval, they did so in a way that sensationalized and emphasized the rarity of middle-class familial deviance. In contrast, the fin-de-siècle domestic novel brought a greater range of idiosyncratic families and households under a newly sociological lens and explored them as part of the reality of modern British family life. The persistent attention to alternative domesticities by novelists writing in the fin-de-siècle period suggests that the social problems of the day required new novelistic genres and formal strategies beyond those favoured by writers of sensation fiction and sentimental domestic novels in the earlier part of the century. Through readings of late-career novels by the popular Victorian sensationalist Wilkie Collins and a New Woman novel by the anti-feminist editorialist Eliza Lynn Linton, this thesis argues that the generic hybridity of such fin-de-siècle British novels resulted in a capacious domestic narrative that often looked beyond the fraught unit of the biological family to posit an unprecedented range of new family configurations.

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Throughout his life Gustav Mahler (1860-1911) was aware of his role as an outsider and had a deeply conflicted view of his identity. The challenges he faced as a Jew in an overwhelmingly Christian and increasingly anti-Semitic Central Europe, as a German speaker in predominantly Czech speaking Bohemia and Moravia, as a Czech in the Austrian empire, and as an Austrian in a highly militarized but rapidly declining empire in the face of increasing pan-German nationalism, all contributed to this status. At the same time, his diverse early background provided a rich variety of musical experience, leading to an openness to musical influences that would accompany him throughout his career. Mahler was one of the first German modernists. His approach to the symphony was unique, revolutionary and widely misunderstood. By stretching the boundaries of structure and content with references to childhood, nature and the sounds and images of everyday life, through the deliberate, unsettling juxtaposition of the banal and the sublime, and through the use of voice and text, he used the symphony as a vehicle for personal reflection and exploration. Mahler’s primary forms of composition were Lieder and symphonies, and as his career progressed the two became inexorably intertwined. His music has been described as Weltanschauungsmusik - music that expresses a world outlook. Driven by a desire to engage with the symphonic tradition, his works included the first non-programmatic choral symphonies since Beethoven. This study focuses on particular aspects of Mahler’s compositional style to demonstrate his continuous search for identity: the references to and quotations from his own songs, from the works of other composers, and from sources such as Jewish/Central European folk music; the rhythmic influence of dances and marches as social references and indicators; the use of non-traditional instrumentation, timbre and sound effects to provide emphasis, coloration and contrast; and the symphonic use of vocal music to explore religious and philosophical beliefs.

Yes / This article presents the homotopy perturbation method (HPM) employed to investigate the effects of inclination on the thermal behavior of a porous fin heat sink. The study aims to review the thermal characterization of heat sink with the inclined porous fin of rectangular geometry. The study establishes that heat sink of an inclined porous fin shows a higher thermal performance compared to a heat sink of equal dimension with a vertical porous fin. In addition, the study also shows that the performance of inclined or tilted fin increases with decrease in length–thickness aspect ratio. The study further reveals that increase in the internal heat generation variable decreases the fin temperature gradient, which invariably decreases the heat transfer of the fin. The obtained results using HPM highlights the accuracy of the present method for the analysis of nonlinear heat transfer problems, as it agrees well with the established results of Runge–Kutta. / Supported in part by the Tertiary Education Trust Fund of Federal Government of Nigeria, and the European Union’s Horizon 2020 research and innovation programme under grant agreement H2020-MSCA-ITN-2016SECRET-722424.

Two existing evaporation two-phase heat transfer models are validated using 526 experimental data points for pure refrigerants and refrigerant mixtures. The Kido et al. (1995) model fails to predict pure refrigerant data sets except their R22 experimental data set. The Cavallini et al. (1999) model successfully predicts the available R22 data sets; however, the model over-predicts the R12 and the R134a data sets. In addition, the Cavallini et al. (1999) mixture model fails to predict the available 155 refrigerant mixture data points. The proposed modified model, based on the Cavallini et al. (1999) model, successfully predicts the experimental data for pure refrigerant and for refrigerant mixtures.

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The study of fluidelastic instability in tube arrays has been ongoing for four decades. Although much research has been conducted, a full understanding of the mechanisms involved is still not available. Designers of cross-flow heat exchangers must depend on experience and empirical data from laboratory studies. As new designs are developed, which differ from these experimental facilities, there is an increased risk of failure due to fluidelastic instability. An experimental program was conducted to examine fluidelastic instability in inline and rotated square finned tube arrays. Three arrays of each geometry type were studied; two with serrated, helically wound finned tubes of different fin densities, and the third, a bare tube which had the same base diameter as the finned tubes. The tube pitch was kept constant to reduce the number of test sections required under this investigation. As a result, the bare tube array has a larger tube pitch ratio than that of previous researchers. The finned tubes under consideration were commercial fmned tubes of a type typically used in the fossil and process industries. The addition of fins to tubes in heat exchangers enhances heat transfer due to the increased surface area and the turbulence produced by the flow moving over the fins. The resulting flow pattern/distribution due to the fins is therefore much more complicated than in bare tube arrays. Previous research has shown that an effective diameter of a finned tube is useful in the prediction of vortex shedding. This concept is used to compare the finned tube results with the existing bare tube array guidelines for fluidelastic instability. All of the tube arrays in the present study have the same tube pitch, and have been scaled to have the same mass ratio. Results for the rotated square arrays show that the use of an effective diameter is beneficial in the scaling of fluidelastic instability and the finned tube results are found to fit within the scatter of the existing data for fluidelastic instability. For in-line square arrays, the results indicate that fins significantly increase the stability threshold. / Thesis / Master of Applied Science (MASc)