Gas Transfer
Mostrando 13-24 de 372 artigos, teses e dissertações.
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13. Waterlogging-induced changes in fermentative metabolism in roots and nodules of soybean genotypes
Waterlogging blocks the oxygen supply to the root system which inhibits respiration, and greatly reduces the energy status of cells that affect important metabolic processes. This study evaluated fermentative metabolism and carbohydrate contents in the root system of two soybean (Glycine max L. Merril) genotypes under hypoxic and post-hypoxic conditions. Nod
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-12
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14. Hydrodynamic and absorption studies of carbon dioxide absorption in aqueous amide solutions using a bubble column contactor
The present work analyses the carbon dioxide absorption process in aqueous n-alkylpyrrolidones solutions, from the point of view of hydrodynamic studies as well as mass transfer, using a bubble column contactor. An analysis of the influence of solute concentration and gas flow-rate is complemented by the study of the effect caused by the alkyl group on the h
Braz. J. Chem. Eng.. Publicado em: 2013-12
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15. Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor
The effects of aeration velocity and liquid properties on the pertinent hydrodynamic and mass transfer parameters in a split-cylinder airlift reactor (with and without packing) were examined. Four different oil-in-water micro-emulsion systems containing kerosene, heavy naphtha, light naphtha and diesel as the oil at the concentration of 7% (v/v) were used in
Braz. J. Chem. Eng.. Publicado em: 2013-09
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16. 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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17. Occurrence of agrochemicals in surface waters of shallow soils and steep slopes cropped to tobacco
Tobacco cultivation in shallow soils and steep landscape under intense use of agrochemicals contributes to environment degradation. In this study, we assessed the concentration of agrochemicals in draw wells used for human consumption and a creek in a small catchment predominantly cropped to tobacco. Chlorpyrifos, flumetralin, and iprodione were determined b
Quím. Nova. Publicado em: 2013
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18. Transferência de metano no sentido gás-líquido com vistas ao atendimento da demanda carbonácea da desnitrificação de esgoto sanitário
This work presents a simulation of a hybrid system for waste water treatment, in order to explain the possible use of a carbon supply on denitrification from the methane produced in an anaerobic reactor and transferred to the liquid mass of a reactor that would be removing nitrogen. It was used the biogas produced in a UASB reactor, that passed through a sto
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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19. 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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20. Adsorção de o-xileno em argila fluidgel organofílica em fase gasosa / Adsorption of o-xylene onto organoclay fluidgel in gas phase
The industrial growth allied to use of petroleum products generate numerous volatile organic compounds (VOC) that are continuously emitted to the atmosphere, degrading air quality and causing serious problems to human health and environment. Among the VOC, the so-called BTEX (benzene, toluene, ethyl benzene, and xylene), are the most important in terms of to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2012
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21. Estudo de colunas de destilação de alta eficiência : HIGEE / Study of high-efficiency distillation columns : HIGEE
Nas últimas décadas, a intensificação de processos tem atraído a atenção da academia e da indústria. A Rotating Packed Bed (RPB) foi desenvolvida no contexto de intensificação de processos e tem sido amplamente usada em destilação, absorção, dessorção, dessulfuração, oxidação, cristalização, precipitação, polimerização e síntese de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/06/2012
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22. NANOCOLORAÇÃO DE LIGAS DE ALUMÍNIO / NANOCOLORING OF ALUMINUM ALLOYS
The use of aluminum becomes increasing because of the lightness of this metal and its high corrosion resistance. The anodization of the aluminum is now a well known and is widely used to increase the durability of the metal. This electrochemical technique forces the growth of oxide layer. The anodized layer has the peculiarity of having the nanotubes which a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/03/2012
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23. Estudo experimental de um resfriador evaporativo ciclônico / Experimental study of a cyclonic evaporative cooling
Este trabalho reporta os resultados obtidos na avaliação experimental de um ciclone de formato americano que foi modificado e adaptado para realizar a climatização de ambientes, através da técnica do resfriamento evaporativo. Para tal, o equipamento foi munido de bocais atomizadores, que realizam a injeção de líquido transversalmente à corrente de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2012
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24. A swirler stabilized combustion chamber for a micro-gas turbine fuelled with natural gas
Micro-gas turbines are a good alternative for on-site power generation, since their operation is very reliable. The possibility of operating with various fuels increases versatility and, as a result, the usage of these devices. Focusing on a performance improvement of a tri-fuel low-cost micro-gas turbine, this work presents investigations of the inner flow
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12