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Previous issue date: 2016-12-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / In the classic set of unit operations of solid-liquid separation, sedimentation and filtration techniques stand out as critical processing steps for a broad spectrum of industrial activities. In this context, the proper knowledge of the properties and characteristics of the particulate systems directly involved represents an important aspect for the safe and efficient design of equipment and processes. Over the past 20 years, several methodologies were developed to study such phenomena, resulting in a huge library of sedimentation and filtration models available in the literature. This work presents a study based on the use of a particle-scale numerical simulation technique called Discrete Element Method (DEM), to describe the deposition of particulate solids in liquids. Tridimensional simulations of the sedimentation and filtration processes were carried out in a previously known flow field, as a way to test the applicability of the code and its capacity to virtually describe such processes. Cake properties, such as thickness, porosity and permeability were quantified over time and compared qualitatively and quantitatively with literature data. The effects of operational conditions, solids and liquid properties on the particulate model?s response were also investigated through a series of controlled numerical tests. The packing fraction values obtained in this work for the sedimentation process, when compared to the values found in the literature on similar conditions, showed a satisfactory agreement, with deviations smaller than 12% for all the points assessed / Dentro do conjunto cl?ssico das opera??es unit?rias de separa??o s?lido?l?quido, as t?cnicas de sedimenta??o e filtra??o se destacam como etapas de processamento cruciais para um amplo espectro de atividades da ind?stria. Neste contexto, o conhecimento adequado das propriedades e caracter?sticas dos sistemas particulados diretamente envolvidos representa um aspecto importante para o projeto seguro e eficiente de equipamentos e processos. Ao longo dos ?ltimos 20 anos, diversas metodologias foram desenvolvidas para estudar tais fen?menos, resultando em uma ampla biblioteca de modelos de sedimenta??o e filtra??o dispon?vel na literatura. O presente trabalho apresenta um estudo baseado no uso da simula??o num?rica em escala de part?cula, atrav?s do M?todo de Elementos Discretos ou DEM (do ingl?s ?Discrete Element Method?), para descrever a deposi??o de s?lidos particulados em suspens?es. Foram realizadas simula??es da sedimenta??o e filtra??o em tr?s dimens?es como forma de testar o funcionamento do c?digo e a sua capacidade de reproduzir virtualmente tais processos. As propriedades da torta, tais como espessura, porosidade e permeabilidade foram quantificadas ao longo do tempo e comparadas qualitativa e quantitativamente com dados da literatura. A sensibilidade do modelo desenvolvido a varia??es nas condi??es operacionais de simula??o e nas propriedades f?sicas do s?lido e do l?quido tamb?m foi analisada. Os dados de fra??o de s?lidos obtidos nas simula??es da sedimenta??o apresentaram uma concord?ncia satisfat?ria, quando comparados aos valores encontrados na literatura em condi??es similares, apresentando desvios menores do que 12% para todos os pontos avaliados.
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/2040 |
| Date | 21 December 2016 |
| Creators | Alvim, Jo?o M?rcio sutana |
| Contributors | Meleiro, Luiz Augusto da Cruz, Cal?ada, Lu?s Am?rico, Torres, Alexandre Rodrigues, Mancini, Mauricio Cordeiro |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Engenharia Qu?mica, UFRRJ, Brasil, Instituto de Tecnologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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