Permeability optimization and performance evaluation of hot aerosol filters made using foam incorporated alumina suspension

Innocentini, M. D. M.; Rodrigues, V. P.; Romano, Roberto; Pileggi, Rafael Giuliano; Silva, Gracinda M.C.; Coury, José Renato

doi:10.1016/j.jhazmat.2008.05.025

Cited by 68 publications

(52 citation statements)

References 13 publications

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“…Figure 5 shows air permeation plots of samples C-2 and C-4, although compositions C-1 and C-3 showed the same behavior. The tested air velocity range (0 to 0.10 m.s -1 ) is typical of those used in applications that involve aerosol filtration 27 . The fit of the Forchheimer equation to a parabolic function was satisfactory, with correlation coefficient (R 2 ) greater than 0.999 for all of the curves.…”

Section: Resultsmentioning

confidence: 99%

“…Only composition C-1 showed permeability coefficients (k 1 = 1.73 × 10 -13 m 2 and k 2 = 1.00 × 10 -8 m) in good agreement with those used in granular and fibrous filters for aerosols. The most suitable k 1 and k 1 values for this application are on the order of k 1 ≈ 10 -11 m 2 and k 2 ≈ 10 -6 m [27] . The relative importance of the coefficients k 1 and k 2 to the analysis of permeability of a porous medium for a given application depends on the term that dominates the pressure drop over the flow, as specified in Equation 1.…”

Section: Resultsmentioning

confidence: 99%

“…Changes in the processing variables can increase interconnected porosity and pore size or can decrease the tortuosity and the roughness of the pores. These changes will result in an increase in k 1 and k 2 , although the magnitudes of the changes will differ 18,[27][28][29] . Permeation is also highly susceptible to phenomena induced by the temperature during the processing of porous ceramic materials.…”

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Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

et al. 2013

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The aim of this work was to experimentally evaluate the use of calcium carbonate as a poregenerating agent in ceramic compositions. Compositions that contained 50% kaolin, 20% limestone, and different concentrations of quartz and feldspar were prepared by uniaxial pressing. Samples were heat-treated at a heating rate appropriate to induce calcium carbonate degassing, and they were then sintered at 800, 900, and 1050 °C. Tests of X-ray fluorescence, thermogravimetric analysis, porosimetry, and air permeation were performed. The composition (wt%) that contained 50% kaolin, 20% limestone, 20% feldspar, and 10% quartz and heat treated at 1050 °C (k 1 = 1.73×10 -13 m 2 and k 2 = 1.00×10 -8 m) showed the highest level of permeability among the investigated samples. Fluid dynamics simulations showed that the prepared samples would exhibit a pressure drop greater than the range desired for applications that involve the filtration of aerosols, but alternatively would be suitable as substrates for asymmetric membranes in microfiltration applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

et al. 2013

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“…Neste método a diferença entre a pressão atmosférica e a pressão interna na câmara de ensaio produziu um fluxo não estacionário dentro do corpo de prova, durante um intervalo de tempo. Tal tempo foi, então, quantificado e os resultados de k 1 (constante de permeabilidade darcyana) foram obtidos a partir da equação de Forchheimer [14,15]. Os ensaios no estado endurecido foram realizados após cura por 28 dias e os corpos de prova foram curados a 23 ºC, em atmosfera com umidade relativa de 98%.…”

Section: Procedimento Experimentalunclassified

Influência da variação da velocidade de rotação e do tipo de cimento nas propriedades de argamassas de revestimento nos estados fresco e endurecido

Torres¹,

Romano²,

Pileggi³

2017

Cerâmica

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ResumoA etapa de mistura influencia as condições de execução do revestimento de argamassa, visto que desde o primeiro contato dos materiais sólidos com água uma série de eventos de aglomeração e desaglomeração no sistema é verificada. Acontece que durante o processamento das argamassas em obra a utilização de equipamentos com distintos mecanismos de mistura pode modificar o desempenho do sistema de revestimento. Este trabalho foi realizado com o objetivo de avaliar a influência da condição de mistura durante o processamento de argamassas aditivadas com incorporador de ar e formuladas com diferentes tipos de cimento. As misturas foram realizadas em um reômetro rotacional variando-se a velocidade de rotação, porém mantendo-se o tempo total de batimento. Reometria de mistura, ciclo de cisalhamento e teor de ar incorporado foram as propriedades avaliadas no estado fresco, enquanto porosidade, resistência mecânica, módulo de elasticidade e permeabilidade ao ar foram utilizados para avaliação do estado endurecido. Com base nos resultados obtidos pôde-se afirmar que a variação da velocidade de rotação e o tipo de cimento utilizado impactaram as propriedades das composições nos estados fresco e endurecido. Palavras-chave: argamassa, CPIIF, CPIII, energia de mistura, reômetro. Abstract The mixing stage is one of the most important step for the execution of the rendering mortar, since from the first contact of the solid materials with water a series of agglomeration and deagglomeration events in the system is verified. However, during the mortar processing in the buildings the use of different equipments, with distinct mixing concepts, makes this stage very uncontrolled. The main purpose of this work was to evaluate the influence of mixing condition during the processing of mortars with addition of air-entraining agent and formulated with different kind of

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“…Fluid permeation through porous media is closely related to various engineering processes such as filtration and separation of the substances (Innocentini et al 2009;Liekens et al 2011), paper coating (Vidal et al 2009), trickle-bed reaction, and radionuclide isolation (Hirono et al 2003). For better performance and higher efficiency of these processes, it is important to evaluate properly the permeation characteristics which depend on the pore structures of the media.…”

Section: Introductionmentioning

confidence: 99%

Fluid Permeability in Stratified Unconsolidated Particulate Bed

Otomo

Harada

2012

Transp Porous Med

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Fluid permeability of polydisperse particulate bed with finite thickness has been examined. On the assumption of creeping flow, the permeability of monodisperse particles with arbitrary arrangement is calculated by means of Stokesian dynamics approach in which the interaction between individual particles and interstitial fluid is described by multipole expansion of the Oseen tensor. We have extended such calculation method to polydisperse particulate systems which have not so dense structures (up to particle volume fraction φ ~ 0.2). The particles are located infinitely in space and their interaction has been taken into account by Ewald summation technique. For the spatial distribution of polydisperse particles, we consider locally-stratified particulate beds and define stratification degree as a parameter which apparently and mathematically represents the thickness of the mixing region of different-sized particles. The permeability profiles in the particulate beds with different stratification degree show the dependence of local permeability on the spatial and size distribution of particles. Consequently, the calculation results indicate that the permeability of non-uniform polydisperse particulate bed can be predicted by integrating the local permeation resistance which is determined by the local specific surface area.

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Permeability optimization and performance evaluation of hot aerosol filters made using foam incorporated alumina suspension

Cited by 68 publications

References 13 publications

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Influência da variação da velocidade de rotação e do tipo de cimento nas propriedades de argamassas de revestimento nos estados fresco e endurecido

Fluid Permeability in Stratified Unconsolidated Particulate Bed

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