Cyclones
Mostrando 13-24 de 44 artigos, teses e dissertações.
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13. Efeitos de modelos submalha em escoamentos em ciclones
A Large-Eddy Simulation (LES) of a single-phase turbulent flow in flat bottom model cyclone geometry was performed. The chosen fluid has the physical properties of air, and the particulate phase was not considered in this work, so the underflow duct was not considered idem, which means that the simulated cyclone has only one output (the overflow duct). The c
Publicado em: 2009
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14. Evolução dos eventos El Niños em fases distintas da Oscilação Decadal do Pacífico: impactos no Jato de Baixos Níveis a leste dos Andes e nos ciclones extratropicais da América do Sul / El Niño events and their evolution in different phases of the Pacific Decadal Oscillation: impacts on the Low Level Jet east of the Andes and extratropical cyclones on the South America.
Neste trabalho foi investigado o impacto da evolução dos eventos El Niño (EN) de acordo com as fases distintas da Oscilação Decadal do Pacífico (positiva, ODP(+) e negativa, ODP(-)) nas mudanças no transporte de umidade sobre o Sudeste da América do Sul (SEAS) durante o verão austral de 1950-1999. A resposta da variabilidade do Jato de Baixos Nívei
Publicado em: 2009
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15. NUMERICAL SIMULATION FOR HYDROCYCLONE DESIGNED TO HIGH OIL CONTENT APPLICATION / SIMULAÇÃO NUMÉRICA DO ESCOAMENTO EM HIDROCICLONE DESTINADO A APLICAÇÕES DE ALTO TEOR DE ÓLEO
Cyclonic separation has became more and more important during the last decades as a unit process for gas-liquid, liquid-liquid and solid-liquid separation, mostly in the Petroleum industry. The off-shore exploration¿s growth requires the development of smaller and lighter equipment. This can be achieved by cyclonic separation once centrifugal fields are sev
Publicado em: 2008
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16. Estudo dos efeitos das variáveis geométricas no desempenho de ciclones convencionais e filtrantes
Filtering cyclones are pieces of equipment used for separation of suspended solids present in gaseous streams. This equipment consists of the replacement of the metallic conical section by a porous conical section. In this work, through experimental design, it was studied the influence of four geometric variables on the cut diameter, collection efficiency an
Publicado em: 2007
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17. Estudo dos efeitos das variÃveis geomÃtricas no desempenho de ciclones convencionais e filtrantes
Filtering cyclones are pieces of equipment used for separation of suspended solids present in gaseous streams. This equipment consists of the replacement of the metallic conical section by a porous conical section. In this work, through experimental design, it was studied the influence of four geometric variables on the cut diameter, collection efficiency an
Publicado em: 2007
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18. Modelagem multifasica Euleriana-Euleriana para simulação numerica de ciclones / Eulerian-Eulerian approach for numerical simulation of cyclones
In this work it is presented the computational code CYCLO, which is a program developed specifically to predict the dynamic behavior of the gas-solid flow in cyclones. The cyclones have been used extensively in many industries for a long time for separating the particles from gaseous streams. Since the beginning of the industrialization until the present tim
Publicado em: 2007
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19. Study of gas and gas-solid flow in ciclones using computational fluid dynamics technics / "Estudo dos escoamentos gasoso e gas-solido em ciclones pela aplicação de tecnicas de fluidodinamica computacional"
This work is the result of the efforts of the CFD research group of the Chemical Processes Modeling and Simulation Laboratory located at FEQ-UNICAMP to study gas and gas-particle flow in a cyclone. The starting point was to consolidate previous information in cyclone flow using current CFD techniques. Two research lines were applied: the first one has studie
Publicado em: 2005
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20. Climatology of cyclones, anticyclones and storm tracks: revision of concepts
Este estudo tem a finalidade de descrever climatologia de ciclones extratropicais, anticiclones e storm tracks para o Hemisfério Norte e Sul, através de revisões de vários papers publicados. Ao longo do tempo, vários estudos foram realizados com características de identificar sistemas sinóticos, com ênfase para ciclones em latitudes médias. Para o H
Revista Brasileira de Geofísica. Publicado em: 2004-08
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21. A new role for reduction in pressure drop in cyclones using computational fluid dynamics techniques
In this work a new mechanical device to improve the gas flow in cyclones by pressure drop reduction is presented and discussed. This behavior occurs due to the effects of introducing swirling breakdown phenomenon at the inlet of the vortex finder tube. The device consists of a tube with two gas inlets in an appositive spiral flux that produces a sudden reduc
Brazilian Journal of Chemical Engineering. Publicado em: 2004-01
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22. Principais sistemas sinópticos que atuaram sobre a Península Antártica no verão de 2001/2002 e a circulação troposférica associada / The main synoptic system that effected the Antartic Peninsula in the 2001/2002 summer and the associated tropospheric circulation
The behaviour of synoptics systems which affected the Antarctica Peninsula and Drake Passage during the Operantar XX, in the 2001/2002 summer, were analysed in this study. Three main methods were developed. The first one, is to evaluate the behaviour of the large and mesocyclones which occurred in the area, during december, january and february, using satell
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200302
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23. Analysis of the efficiency of a cloth cyclone: the effect of the permeability of the filtering medium
The cloth cyclone is a solid-gas separation device that consists of a Lapple cyclone whose conical section has been replaced by a conical filtering wall. The present research was undertaken with the aim of examining the influence of a conical filtering section made of three different materials on the performance of a Lapple design cyclone. The overall effici
Brazilian Journal of Chemical Engineering. Publicado em: 2003-10
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24. Uma contribuição ao estudo do escalonamento de ciclones
The use of models in scale is a practical way of studying how the operational parameters influence the performance of industrial cyclones. The model and the prototype cyclones should be built according to a scaling law - given by a set of dimensionless parameters --, so that they are similar. It there will be fluid-dynamical similarity between the cyclones i
Publicado em: 2003