Fluidization
Mostrando 13-24 de 85 artigos, teses e dissertações.
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13. Estudo dos mecanismos de fluidização de areias com jatos de água / Study of the fluidisation mechanism in sandy soils using water jets
A fluidização é definida como a suspensão de partículas de um solo granular devido à ação de um fluxo ascendente, que cria uma força de arrasto suficiente para suportar o peso próprio das partículas, produzindo uma zona fluidizada. Neste trabalho são discutidos os mecanismos e os conceitos envolvidos na fluidização de solos arenosos com a utili
Publicado em: 2010
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14. Aglomeração de polpa de acerola e proteina isolada de soja em po em leito fluidizado conico e pulsado / Agglomeration of acerola powder and soy protein isolate in a conical pulsed fluid bed
Fluid bed agglomeration is commonly used to improve the instant properties of spray-dried food powders. However, the fluidization of spray-dried particles is characterized by cracks and channels. Vibration or pulsation systems are frequently attached in the fluid bed equipments in order to improve the bed homogeneity and to allow the particles fluidization u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/03/2009
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15. Size distribution of agglomerates of milk powder in wet granulation process in a vibro-fluidized bed
Results of experiments on the influence of technological parameters (intensity of vibration, granulation of the liquid feed, temperature of fluidization agent) on the change of size distribution, as well as mass mean diameter of the milk powder particles subjected to the wet granulation process (agglomeration) in a vibro-fluidized bed granulator are shown in
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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16. Identification of defluidization region in a gas-solid fluidized bed using a method based on pressure fluctuation measurements
Industrial applications that involve fluidized bed operations must prevent the undesirable phenomenon of partial or complete bed defluidization. Defluidization can be avoided by increasing the gas velocity and/or, in some cases, changing the solid feed conditions in the system, provided that the changes in the hydrodynamics of the flow are detected early eno
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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17. Experimental and theoretical investigation of anaerobic fluidized bed biofilm reactors
This work presents an experimental and theoretical investigation of anaerobic fluidized bed reactors (AFBRs). The bioreactors are modeled as dynamic three-phase systems. Biochemical transformations are assumed to occur only in the fluidized bed zone. The biofilm process model is coupled to the system hydrodynamic model through the biofilm detachment rate; wh
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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18. Experimental investigation of thermal conductivity coefficient and heat exchange between fluidized bed and inclined exchange surface
The paper presents experimental research of thermal conductivity coefficients of the siliceous sand bed fluidized by air and an experimental investigation of the particle size influence on the heat transfer coefficient between fluidized bed and inclined exchange surfaces. The measurements were performed for the specific fluidization velocity and sand particl
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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19. FBC desulfurization process using coal with low sulfur content, high oxidizing conditions and metamorphic limestones
A metamorphic limestone and a dolomite were employed as SO2 sorbents in the desulfurization of gas from coal combustion. The tests were performed in a fluidized bed reactor on a bench and pilot scale. Several parameters such as bed temperature, sorbent type, and sorbent particle size at different Ca/S molar ratios were analyzed. These parameters were evaluat
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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20. Fluidodinâmica de leitos fluidizados e vibrofluidizados operando com partículas planas
The use of fluidized beds as a unit operation for drying of particulate materials is common in industrial processes. However, most works published in the literature, focus the drying of uniform particles, in a narrow range of size distribution. The appealing characteristics of fluidization for drying led some authors to suggest its use for drying of particle
Publicado em: 2009
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21. On the statistical steady state gas-solid flow in a riser as predicted through a two-fluid simulation
This work is concerned with the extremely high computational costs of the two-fluid simulations of gas-solid flows in risers. In a previous article [1] a procedure was proposed to speed up the simulations towards the desired statistical steady state flow regime. In this continuing article the concern is turned to the time extent that a simulation must advanc
Computational & Applied Mathematics. Publicado em: 2009
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22. Simulação e análise de colunas granulares não homogêneas submetidas à vibração vertical / Simulation and analysis of inhomogeneous granular columns under vertical vibration
Usando a técnica de Eventos-Dirigidos, apresentamos resultados de simulações computacionais da dinâmica de um fluido granular unidimensional. O sistema compõe-se de uma coluna vertical de esferas submetidas à ação de uma base vibratória. O sistema se reduz ao problema da bola oscilante em sua instância mais simples usando apenas uma esfera. Assim c
Publicado em: 2009
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23. Avaliação do tipo de material filtrante no comportamento hidráulico de filtros rápidos de camada profunda no tratamento de águas de abastecimento. / Evaluation of filter media in the hydraulic behaviour of rapid gravity depth bed filters used in drinking water treatment.
This project researched the filtration stage in the water treatment process for public use. The research used a pilot filtration system based on four rapid gravity depth bed filters, with a filtration rate of 500m3/m2/dia. The water used in the experiment came from sedimentation tank of the Rio Grande water treatment facility. During the experimental phase t
Publicado em: 2009
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24. Analysis and development of automatic multipoint static pressure measure system in a circulating fluidized bed / Desenvolvimento e analise de um sistema automatico multiponto para medida da pressão estatistica ao longo do circuito principal de um leito fluidizado circulante
A tecnologia de leito fluidizado circulante vem sendo desenvolvida até hoje para uma variedade de processos industriais oferecendo características fortemente desejáveis como: uniformidade da temperatura, ótimo contato gás-sólido, elevadas taxas de transferência de calor e massa entre gás e partículas, capacidade de processamento maior e mais eficien
Publicado em: 2009