Bubble Columns
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Comparative evaluation between mechanical and pneumatic cells for quartz flotation in the iron ore industry
Abstract Flotation plays a relevant role in the concentration of iron ores. Conventional flotation technology employing mechanical machines and columns and also circuits combining both types of cells have been utilized in the iron ore industry. The top size of particles in the flotation circuit feed is 150 µm and the slimes below 10 µm are removed as overf
REM, Int. Eng. J.. Publicado em: 2018-07
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2. Mass transfer of SO2 absorption with an instantaneous chemical reaction in a bubble column
Gas absorption accompanied by an instantaneous irreversible chemical reaction in bubble columns has been analyzed theoretically. A mass transfer model based on the Dankwerts surface-renewal model as well as the penetration theory for surface stretch proposed by Angelo et al. was developed, in which the effects of bulk motion and turbulence on mass transfer w
Braz. J. Chem. Eng.. Publicado em: 2013-09
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3. Experimentação física do escoamento gás-líquido em uma coluna de bolhas retangular utilizando a técnica PIV e a técnica de sombras SHADOW / Gas- liquid experimentation in a rectangular bubble column using PIV and Shadow techniques
Bubble columns are multiphase contact devices for mass and heat transfer, wich are intensively used in different industrial areas. Flow and turbulence in these equipments are induced by the bubble rise motion. The hydrodynamics and bubble behavior in a homogeneous bubbly flow regime was analyzed in a rectangular laboratory-scale bubble column (50 x 20 x 220
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2012
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4. Ozone application in water sources: effects of operational parameters and water quality variables on ozone residual profiles and decay rates
Systematic ozonation tests were conducted by means of a mobile pilot plant. Water source 1 was a low turbidity stream with very low solids content and very low turbidity, apparent color and alkalinity. Water source 2 was reservoir water with higher turbidity, solids content and alkalinity than source 1. The ozone plant was a counter-current contactor compose
Brazilian Journal of Chemical Engineering. Publicado em: 2010-12
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5. Determination of the liquid pool surfactant and protein concentration for semi-batch foam fractionation columns
A model is derived for the change with time of the concentration of a surface-active component in the liquid pool of a semi-batch foam fractionation process. The transport of surface-active material to the gas-liquid interface was assumed to be limited by the mass transfer rates, and the concentration of the adsorbed material at the interface was assumed to
Brazilian Journal of Chemical Engineering. Publicado em: 2007-03
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6. Simulação tridimensional de uma coluna de bolhas-diferentes abordagens geometricas e modelagem / Three-demensional simulation of bubble columns-model and geometrical approaches on hydrodynamics
Colunas de bolhas são equipamentos utilizados para realizar operações de transferência de massa e/ou calor entre uma fase gasosa e uma fase líquida, ou entre uma fase gasosa e uma fase sólida dissolvida ou suspensa na fase líquida com ou sem reação química. Elas são equipamentos de simples operação, mas que apresentam uma fluidodinâmica bastant
Publicado em: 2007
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7. Correlation between images and electrical signals for determination of bubble diameters in liquids / Correlação entre imagens e sinal elétrico para determinação do diâmetro de bolhas em líquidos
The distribution of bubble sizes is a critical feature in twophase systems. The interfacial area of bubbles is strongly related to chemical reaction and mass transfer rates in industrial applications such as distillation and fermentation columns, biological systems, oxidation, hydrogenation, waste water treatment and in natural processes such as aerosol dy
Publicado em: 2006
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8. Efeito do tempo de residência sobre a recuperação metálica da flotação colunar reversa de minério de ferro
The goal of this work was to investigate the effect of residence time of the particles in the collection zone of the column over the recovery in reverse flotation of iron ore. It was studied the variation of floatable (recovery) with the feed and height rate of the column. In spite of the enormous number of columns already built in Minas Gerais, very little
Publicado em: 2006
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9. Three-dimensional simulation of gas-liquid in bubble columns / Simulação tridimensional com sistema gas-liquido em colunas de bolhas
Bubble columns are equipments of simple operation, but presents a complex fluidodynamic. Its basic operation consists of the injection of a gas (disperses phase) in the bottom of the column in a liquid medium (continuous phase). As reactors, they are used in a variety of chemical processes, such as Fischer-Tropsch synthesis, oxidation reactions, alkylation r
Publicado em: 2005
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10. ANALYSIS OF TRICKLE BED AND PACKED BUBBLE COLUMN BIOREACTORS FOR COMBINED CARBON OXIDATION AND NITRIFICATION
Biological removal of nitrogen and carbon by combined nitrification-oxidation in gas-liquid trickle-bed reactors (TBRs) and packed bubble columns (PBCs) was analyzed theoretically using a transient two-dimensional model. The model describes TBR and PBC performances at steady state as well as their transient response to a pulse or step increase in inlet metha
Brazilian Journal of Chemical Engineering. Publicado em: 2002-03