Natural Convection
Mostrando 25-36 de 59 artigos, teses e dissertações.
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25. Numerical analysis of water melting and solidification in the interior of tubes
Latent energy storage systems find applications in many engineering fields, including industrial refrigeration plants, air conditioning installations, recovery of heat in industrial processes, etc. To tackle the design of such systems, it is necessary to have correlations to account for the heat transfer during the melting and solidification of the phase cha
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-06
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26. Transient convective heat transfer
In nature, as well as within the human-made thermal systems, the time-variable regimes are more commonly encountered, if not always, than the permanent regimes. Nevertheless, studies in convection are still more frequent in the permanent regimes, undoubtedly due to the related difficulties in calculation in terms of time and cost of computation. One may dist
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
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27. Natural convection in a vertical and arbitrary inclined plate with protruding heated element / Convecção natural em placa nas posições vertical e inclinada contendo elementos protuberantes aquecidos
No presente trabalho o resfriamento por convecção natural de uma placa plana, disposta em um meio infinito, contendo elementos protuberantes aquecidos e distribuídos uniformemente sobre uma das paredes da placa é analisado experimentalmente sob a condição de aquecimento uniforme. A parede oposta da placa de teste é isolada utilizando um aquecedor de p
Publicado em: 2005
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28. Modelo computacional bidimensional para escoamentos gasosos com transferência de calor em um reator tipo CVD / Computational model 2D for gaseous flow with heat transfer for a reactor type CVD
In this work was made the elaboration of an prototype for the computational numerical simulation of the gaseous ow, with transfer heat, applied to the reactor type CVD, existing in the Laboratorio Associado de Sensores e Materiais (LAS) of the Instituto Nacional de Pesquisas Espaciais (INPE). Initially, we intention was to dene which the best type of mesh to
Publicado em: 2005
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29. Influencia da convecção no liquido nas variaveis termicas e estruturais na solidificação descendente de ligas Sn-Pb
Poucos estudos têm analisado os efeitos da convecção no líquido interdendrítico, bem como a influência da direção de crescimento em relação à gravidade nas variáveis térmicas e estruturais durante a solidificação. Neste trabalho, foi utilizado um dispositivo de solidificação unidirecional vertical descendente, constituído por uma lingoteira
Publicado em: 2005
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30. Analise termofluidodinamica de reatores nucleares de pesquisa refrigerados a agua em regime de convecção natural
The STHIRP-1 computer program, which fundamentals are described in this work, uses the principles of the subchannels analysis and has the capacity to simulate, under steady state and transient conditions, the thermal and hydraulic phenomena which occur inside the core of a water-refrigerated research reactor under a natural convection regime. The models and
Publicado em: 2004
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31. Analysis of the coupling between penalty method and pressure Poisson equation in convective problems.
The intent of this work is to analyse by means of numerical experiments the characteristics in terms of performance when the penalty method and the pressure Poisson equation formulation are combined to solve convective problems. Besides that, the penalty method and the pressure Poisson equation formulation are applied independently and compared with the coup
Publicado em: 2003
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32. Turbulent natural convection in porous enclosures.
This work applies the volume-average mathematical operator over the buoyancy terms in the flow equations governing turbulent flow. Volume averaging is taken on both mean and turbulent fields. Derivations are carried out under the recently established double-decomposition concept. Results show that additional buoyancy generation term appears if both averaging
Publicado em: 2003
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33. Convecção natural tridimensional sobre fontes de calor discretas
In this work, the electronic component cooling is focused, aiming the understanding of the three-dimensional effects present in the natural convection on discrete or pontual heat sources. The finite volume method, implemented in the FLUENT package, was used to simulate the heat transfer processo The steady state flow was considered laminar and the properties
Publicado em: 2003
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34. Multivariable robust control of an integrated nuclear power reactor
The design of the main control system of the CAREM nuclear power plant is presented. This plant is an inherently safe low-power nuclear reactor with natural convection on the primary coolant circuit and is self-pressurized with a steam dome on the top of the pressure vessel (PV). It is an integrated reactor as the whole primary coolant circuit is within the
Brazilian Journal of Chemical Engineering. Publicado em: 2002-12
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35. Análise dos efeitos razão de aspecto e inclinação na convecção natural em cavidades via transformação integral / Analysis of aspect radio and inclination effects in the natural convection in cavities through integral transformation
Neste trabalho, serão analisados os efeitos da razão de aspecto e ângulo de inclinação na transferência de calor por convecção via transformação integral, através de simulações em uma cavidade quadrada e plana com um fluido de propriedades constantes e variáveis, identificando a influência à variações de temperatura, bem como as combinaçõ
Publicado em: 2002
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36. AnÃlise dos efeitos razÃo de aspecto e inclinaÃÃo na convecÃÃo natural em cavidades via transformaÃÃo integral / Analysis of aspect radio and inclination effects in the natural convection in cavities through integral transformation
Neste trabalho, serÃo analisados os efeitos da razÃo de aspecto e Ãngulo de inclinaÃÃo na transferÃncia de calor por convecÃÃo via transformaÃÃo integral, atravÃs de simulaÃÃes em uma cavidade quadrada e plana com um fluido de propriedades constantes e variÃveis, identificando a influÃncia à variaÃÃes de temperatura, bem como as combinaÃÃ
Publicado em: 2002