Analysis of the sedimentation process in reactive polymeric suspensions

Shojaei, Akbar; Arefinia, Reza

doi:10.1016/j.ces.2006.08.050

Cited by 19 publications

(16 citation statements)

References 50 publications

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“…Several mixture viscosity models can found in the literature: Eilers, [6] Krieger and Dougherty, [18] or Arefinia and Shojaei. [1,35] In this paper the mixture viscosity model of Thomas [37] is used:…”

Section: Drift Fluxmentioning

confidence: 99%

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Goeree

Keetels

Munts³

et al. 2016

Can J Chem Eng

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In this paper, the concentration and velocity profiles of sediment water mixtures for open-channel flows are modelled numerically and validated with experimental results. A continuum approach, the drift flux model, is used. The mixture consists of volume fractions with different particle sizes. Hindered settling is taken into account with the closure relation of Richardson and Zaki. Transport equations are used for sediment transport. Turbulence is modelled with the LES (large eddy simulation) WALE model. The discretization of the transport and Navier-Stokes equations is done with the finite volume method. The Navier-Stokes equations are solved using a fractional step method. The numerical results are compared with experimental results concerning open-channel flows.

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Section: Drift Fluxmentioning

confidence: 99%

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Goeree

Keetels

Munts³

et al. 2016

Can J Chem Eng

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“…Para estudar a sedimentação das suspensões, o volume de sedimentação foi determinado em função do tempo. Este teste é utilizado para suspensões mantidas em uma condição estacionária, onde as partículas sedimentam somente no sentido vertical devido à ação da força da gravidade (Shojaeia & Arefinia, 2006).…”

Section: Determinação Do Volume De Sedimentaçãounclassified

Avaliação da qualidade de amostras comerciais de leite de janaguba (Himatanthus drasticus (Mart.) Plumel) em Fortaleza – Ceará

Soares

Almeida

Miranda

et al. 2016

Rev. bras. plantas med.

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RESUMO:Os fitoterápicos à base de leite de janaguba (Himatanthus drasticus (Mart.) Plumel), usados para o tratamento de câncer, úlcera gástrica e outras doenças, são muito vendidos em mercados públicos de Fortaleza (CE). No entanto, registros mencionam que é comum a troca deste leite por látex de mangabeira (Hancornia speciosa Gomes). O trabalho objetivou avaliar a qualidade físico-química, química e microbiológica de amostras comerciais do leite de janaguba. Dez amostras comerciais foram adquiridas de um mercado de Fortaleza; quatro amostras autênticas de látex de janaguba foram obtidas da chapada do Araripe e uma amostra de látex de mangabeira foi obtida em Paracuru (CE). Foram determinados o aspecto geral, densidade, pH, resíduo seco, volume de sedimentação, perfil cromatográfico e qualidade microbiológica das amostras. Os resultados mostraram elevada contaminação microbiológica nas preparações comerciais e adulteração em seis destas amostras, o que aponta a urgente implantação de uma efetiva farmacovigilância dos fitoterápicos a fim de tornar seu consumo mais seguro e racional.Palavras-chave: fitoterápicos, qualidade, látex; janaguba; Himatanthus drasticus ABSTRACT: Quality assessment of commercial samples of janaguba's milk (Himatanthus drasticus (Mart.) Plumel) in Fortaleza -Ceará. The herbal medicines made from janaguba milk (Himatanthus drasticus (Mart.) Plumel), used to treat gastric ulcer, cancer and other diseases, and arewidely sold in the public markets of Fortaleza (CE). However, records mention that it is common to make fake copies of the milk by using mango tree latex (Hanconia speciosa Gomes). This study aimed to evaluate the chemical, physical-chemical and microbiological quality of commercial samples of janaguba milk. Ten commercial samples were purchased from a Fortaleza market; four authentic samples of janaguba latex were obtained from the Araripe plateau, and one mango tree latex sample was obtained in Paracuru (CE). We determined the general appearance, density, pH, dry residue, sedimentation volume, chromatographic profile and microbiological qualities. Results showed high microbiological contamination in the commercial preparations and evidence of tampering in six of these samples, which indicates the need for an urgent implementation of an effective pharmacovigilance strategy for herbal medicines in order to make its consumption more secure and rational.

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“…6 Modeling of the fiber sedimentation is an efficient predictive tool to control the solid concentration distribution and to avoid sedimentation and has been a subject of research of several authors. 14-18 In a previous paper, we developed a simple model to predict the sedimentation of metal fibrous particles in viscous resins.…”

Section: Introductionmentioning

confidence: 99%

A study on fiber sedimentation velocity in epoxy/steel fiber composites used for hybrid injection molds

Howarth¹,

Pouzada

Maia

et al. 2013

Journal of Composite Materials

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Composites based on metallic fibers and thermosetting polymers are being increasingly used for molding blocks of hybrid injection molds, thereby improving the mechanical and thermal properties. However, an adequate study on the behavior of steel fibers in a reactive epoxy resin is necessary to understand how to maintain suitable mold properties. In this paper, the sedimentation velocity of short steel fiber suspensions in reactive epoxy resin was estimated using a model emerging from the Stokes equation and considering the resin rheology and correction factors for the fiber shape and concentration. DMP (2,4,6-tris (dimethylamino-methyl) phenol) was the accelerator more suitable for this type of composites because it increases the rate of cure and reduces the gel time more pronouncedly than any of the other common accelerators. Samples were manufactured with epoxy resin, short steel fiber and DMP as accelerator, and using anti-sedimentation equipment. The distribution of the fibers was observed in all composites. The viscosity data were used to predict the time in the anti-sedimentation equipment necessary to reach a minimum sedimentation velocity using the mathematical model. Results showed that this velocity is recommended to be below 3.28 Â 10 À8 m/s to avoid sedimentation of the steel fibers.

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Analysis of the sedimentation process in reactive polymeric suspensions

Cited by 19 publications

References 50 publications

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Avaliação da qualidade de amostras comerciais de leite de janaguba (Himatanthus drasticus (Mart.) Plumel) em Fortaleza – Ceará

A study on fiber sedimentation velocity in epoxy/steel fiber composites used for hybrid injection molds

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