Liquid Vapor Flow
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Automatização de um pulverizador hidropneumático visando o controle do espectro de gotas em função do déficit de pressão de vapor dágua do ar / Automation of a hydro-pneumatic sprayer for controlling droplet spectrum in function of deficit of water vapor pressure in the air
Pesticide spraying is one of the most repeated operations in farms, this has occurred mainly due to adoption of no tillage. Facility for purchasing pesticides is notorious throughout Brazil. However, technology for its application has been difficult to reach the producers, even in regions with high agricultural potential. This work aimed to develop a system
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2012
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2. Experimental study of a rotating packed bed distillation column
The purpose of this work was to study the mass transfer performance of rotating packed beds applying the "Higee" process. The operations were carried out with the n-hexane/n-heptane distilling system at atmospheric pressure and under total reflux conditions. The rotating speed could be varied between 300 and 2500 rpm, which provided centrifugal forces from 5
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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3. Simulation of styrene polymerization reactors: kinetic and thermodynamic modeling
A mathematical model for the free radical polymerization of styrene is developed to predict the steady-state and dynamic behavior of a continuous process. Special emphasis is given for the kinetic and thermodynamic models, where the most sensitive parameters were estimated using data from an industrial plant. The thermodynamic model is based on a cubic equat
Brazilian Journal of Chemical Engineering. Publicado em: 2008-06
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4. Development of a computaciona model for thermal cracking processes / Desenvolvimento de modelo computacional para craqueamento termico
The mathematical modeling and the computational simulation of a process furnace for thermal conversion of heavy oil fractions is developed in this work. Kinetics of conversion reactions is from Sugaya (1993). It is based in a first order irreversible reaction with 9 lumps and 24 pseudocomponents. The 24 pseudocomponents are characterized and their properties
Publicado em: 2008
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5. Modelagem matematica multifasica e simulação tridimensional e transiente para sistemas gas-liquido : o caso do escoamento liquido-vapor em colunas de destilação / Mathematical modeling and numerical simulation for gas-liquid systems : the case of the liquid-vapor flows in distillation columns
Os mecanismos fenomenológicos que ocorrem em equipamentos industriais são muito importantes para o projeto e otimização de equipamentos e processos. Neste caminho, a destilação, a mais importante técnica de separação, é foco de diversos estudos que tem como objetivo compreender a fenomenologia deste sistema. Os modelos atuais para a representação
Publicado em: 2007
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6. Optimization of pipeline scheduling operations: efficient formulations and hydraulic considerations. / Otimização da programação de operações dutoviárias: formulações eficientes e considerações hidraúlicas.
Pipeline systems correspond nowadays to the most efficient mode for the transportation of large amounts of liquid and vapor products for long distances. Pipelines are utilized by the Petroleum Industry to transport petroleum and its product derivatives. The present work addresses the scheduling of pipeline distribution of a system that operates with a pipeli
Publicado em: 2007
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7. Hydrodynamic and tray efficiency behavior in parastillation column
This work presents aspects of the parastillation process, which employs a unique distillation column where the vapor stream is divided into two equal parts and the falling liquid is alternately in contact with both vapor parts on a stage-by-stage basis. A laboratory-scale apparatus was used to study the parastillation column. Experiments were carried out und
Brazilian Journal of Chemical Engineering. Publicado em: 2006-03
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8. Development of a methology for numerical and experimental evaluation of liquid/vapour flow in distillation columns / Desenvolvimento de uma metodologia para avaliação numerica e experimental do escoamento liquido/vapor em colunas de destilação
Grande parte dos estudos envolvendo colunas de destilação está fundamentada por modelos macroscópicos de conservação de massa e de energia. Exemplo disto são os modelos de estágios de equilíbrio e de não-equilíbrio. Nestes, os aspectos fluidodinâmicos do escoamento são restritos e orientados à medição de parâmetros macroscópicos. Porém, gr
Publicado em: 2005
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9. Compostos carbonílicos no ar em ambientes de trabalho de carvoarias na Bahia.
The goals of the present work were: to present an analytical methodology applicable to the determination of carbonyl compounds (CC) in vapor phase, in area and personal samples collected in charcoal company workplaces; to determine the CC profile in air inhaled by charcoal workers; and to quantify the CC in vapor phase in air of workplaces and breathing zone
Publicado em: 2005
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10. Desenvolvimento de modelo de estagios de não equilibrio e proposição de correlações de eficiencia para os processos de destilação convencional e extrativa
Este trabalho tem como objetivo geral a busca de uma metodologia para determinação de eficiências nos processos de destilação, mediante estudo detalhado da influência de parâmetros físicos, térmicos, de transporte e hidráulicos pertencentes aos componentes, às misturas e de detalhes do equipamento de separação. Busca, por outro lado, também, es
Publicado em: 1997
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11. Design and performance of a trickling air biofilter for chlorobenzene and o-dichlorobenzene vapors.
From contaminated industrial sludge, two stable multistrain microbial enrichments (consortia) that were capable of rapidly utilizing chlorobenzene and o-dichlorobenzene, respectively, were obtained. These consortia were characterized as to their species composition, tolerance range, and activity maxima in order to establish and maintain the required operatio
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12. Liquid–vapor oscillations of water in hydrophobic nanopores
Water plays a key role in biological membrane transport. In ion channels and water-conducting pores (aquaporins), one-dimensional confinement in conjunction with strong surface effects changes the physical behavior of water. In molecular dynamics simulations of water in short (0.8 nm) hydrophobic pores the water density in the pore fluctuates on a nanose
National Academy of Sciences.