Residence Time Distribution
Mostrando 1-12 de 98 artigos, teses e dissertações.
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1. Liquid-phase RTD studies in a flotation column: an analysis between tanks-in-series and axial dispersion models
Abstract The objective of the present study is to evaluate the fluid dynamics of a flotation column (2" in diameter and 6 m in height) based on gas hold-up measurements and, in particular, by applying the liquid-phase RTD (residence time distribution) technique. Additionally, a comparative study is performed between different methodologies used to determine
REM, Int. Eng. J.. Publicado em: 2021-01
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2. Simulação computacional de dispositivos de mistura em câmara de combustão para gases de carbonização
Resumo O carvão vegetal proveniente de florestas plantadas é uma fonte de energia renovável utilizada na siderurgia do Brasil, todavia, em sua produção há liberação do gás de pirólise, que pode ser considerado um gás com baixo poder calorífico inferior. A sustentabilidade da produção de carvão vegetal tem demandado a queima destes gases, poden
Ciênc. Florest.. Publicado em: 30/09/2019
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3. Comportamento hidrodinâmico de sistemas alagados construídos de escoamento horizontal subsuperficial de diferentes proporções geométricas e tempos de operação
RESUMO No presente trabalho, teve-se por objetivo avaliar a influência da proporção geométrica e o tempo de operação na hidrodinâmica do sistema. Para isso, três sistemas alagados construídos de escoamento horizontal subsuperficial (SACs-EHSS) de diferentes razões comprimento:largura (L/B) foram caracterizados no que se refere ao comportamento hidr
Eng. Sanit. Ambient.. Publicado em: 25/04/2019
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4. IMPACT OF THE HYDRAULIC LOADING RATE ON THE HYDRODYNAMIC CHARACTERISTICS OF AN ANAEROBIC FIXED BED REACTOR TREATING CATTLE SLAUGHTERHOUSE WASTEWATER
ABSTRACT The hydrodynamic behavior of an anaerobic fixed bed reactor (AFBR) was evaluated in the treatment of cattle slaughterhouse wastewater. The AFBR was operated at hydraulic retention time (HRT) of 14, 11 and 8 h. Stimulus-response assays were carried out with Eosin Y and the experimental data were adjusted to the single-parameter theoretical models of
Eng. Agríc.. Publicado em: 2018-06
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5. Numerical analysis of the liquid ejection due to the gaseous jet impact through computational fluid dynamics
Abstract Metal droplets generated by an impinging jet, play an important role in metal refining processes, mainly in oxygen steelmaking, where the droplets are ejected into the slag phase. Since the available interfacial area of droplets is very high in this process, the generated droplets enhance the rates of heat transfer and chemical reactions. Therefore,
REM, Int. Eng. J.. Publicado em: 2018-03
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6. Overview of medical physics teaching in Brazil
Introduction:Brazil has seen a rise in the number of undergraduate courses in Medical Physics in recent years, as well as initiatives for the organization of graduation programs and clinical residencies in this multidisciplinary area. The purpose of the present study was to perform a data survey on academic training in Medical Physics in Brazil in the underg
Res. Biomed. Eng.. Publicado em: 2015-09
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7. INFLUENCE OF RESIDENCE-TIME DISTRIBUTION ON A SURFACE-RENEWAL MODEL OF CONSTANT-PRESSURE CROSS-FLOW MICROFILTRATION
Abstract This work examines the influence of the residence-time distribution (RTD) of surface elements on a model of cross-flow microfiltration that has been proposed recently (Hasan et al., 2013). Along with the RTD from the previous work (Case 1), two other RTD functions (Cases 2 and 3) are used to develop theoretical expressions for the permeate-flux decl
Braz. J. Chem. Eng.. Publicado em: 2015-03
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8. The influence of screw configurations and feed mode on the dispersion of organoclay on PP
The design of the screw configuration as well as the screw speed, the residence time, the feeder type, and the temperature has a large effect on the dispersion of the clay into the matrix and, consequently, on the mechanical and thermal properties of the polymeric matrix. The objective of the present work was to evaluate the influence of two different screw
Polímeros. Publicado em: 19/04/2013
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9. Distribuição do tempo de residência e letalidade no processamento térmico contínuo de líquidos com escoamento laminar não ideal em trocadores bitubulares. / Residence time distribution and lethality in the continuous thermal processing of liquids with non ideal laminar flow in bitubular exchangers.
Tubular heat exchangers are widely used for thermal processing of viscous liquid foods because they have larger hydraulic diameters than the plate heat exchangers. The calculation of lethality in this type of exchanger is directly related to velocity profile and the residence time distribution (RTD). For the laminar flow of viscous fluids, Newtonian and non-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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10. Investigation of hydrodynamic parameters in a novel expanded bed configuration: local axial dispersion characterization and an empirical correlation study
Study of liquid behavior in an expanded bed adsorption (EBA) system is important for understanding, modeling and predicting nanobioproduct/biomolecule adsorption performance in such processes. In this work, in order to analyze the local axial dispersion parameters, simple custom NBG (Nano Biotechnology Group) expanded bed columns with 10 and 26 mm inner diam
Braz. J. Chem. Eng.. Publicado em: 2012-12
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11. Mudança temporal do aleitamento materno exclusivo na América Latina e Caribe: atualização de seus determinantes e da tendência secular / Temporal change of exclusive breastfeeding in Latin America and the Caribbean: an update of its determinants and secular trend
Introduction: Multiple and interactive protective effects of exclusive breastfeeding (EBF) in health and child survival justify recommendations for promoting universal practice. There are few studies that assess the tendency of the pattern of EBF between countries. Objective: To analyze the temporal change of the AME in five countries in Latin America and Ca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2011
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12. Pré-tratamento do bagaço de cana-de-açúcar com H2SO4 diluído em reator piloto aquecido por vapor direto / Pre-treatment of sugarcane bagasse with dilute H2SO4 in pilot reactor heated by direct steam
This study aimed to evaluate how certain pretreatment conditions of sugarcane bagasse with dilute H2SO4 influence the size distribution of sugarcane bagasse, the chemical composition of solids pretreated and hemicellulosic hydrolysate, as well the enzymatic digestibility of pretreated solids. For that, previously, a sample of in natura sugarcane bagasse was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2011