Viscoelastic Flows
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Estudos de métodos numéricos para a simulação de escoamentos viscoelásticos com superfície livre / Numerical methods for viscoelastic free surface flows
Neste projeto, é apresentado um método numérico com uma abordagem do tipoMAC para a simulação de escoamentos viscoelásticos incompressíveis tridimensionais com superfície livre governados pelo modelo de fluido SXPP. A formulação apresentada nesse trabalho é uma extensão dos resultados obtidos por Oishi et al. (2011), sobre o estudo de métodos nu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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2. High-order finite volume method for solving viscoelastic fluid flows
Computational Fluid Dynamics (CFD) is widely used by polymer processing industries in order to evaluate polymeric fluid flows. A successful computational code must provide reliable predictions (modeling) in a fast and efficient way (simulation). In this work, a new approach to solve the governing equations of viscoelastic fluid flows is proposed. It is based
Publicado em: 2011
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3. Solução Numérica de escoamentos viscoelásticos tridimensionais com superfícies livres: fluidos de segunda ordem / Numerical solution of three-dimensional viscoelastic flows with free surfaces: second order fluids
Este trabalho apresenta uma técnica de diferenças finitas para resolver a equação constitutiva Fluido de Segunda Ordem para escoamentos tridimensionais com superfície livre. As equações governantes são resolvidas pelo método de diferenças finitas em uma malha deslocada 3D. A superfície livre é modelada por células marcadoras (Marker-and-Cell) e
Publicado em: 2010
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4. Uma nova metodologia para a simulação de escoamentos de fluidos viscoelásticos / New approach for simulation of viscoelastic fluid flows
É proposta neste trabalho uma nova metodologia para resolução das equações governantes de fluidos viscoelásticos, baseada no método dos volumes finitos, usando o arranjo co-localizado para as variáveis e malhas estruturadas. São utilizadas aproximações de alta ordem para os fluxos lineares e não-lineares médios nas interfaces dos volumes, e para
Publicado em: 2010
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5. Development of an implicit numerical method for the simulation of viscoelastic free surface flows / Desenvolvimento de um método numérico implícito para a simulação de escoamentos viscoelásticos com superfícies livres
O tema deste trabalho é o estudo de métodos numéricos para a simulação de escoamentos incompressíveis com superfície livre a baixos Reynolds, por meio da metodologia GENSMAC e suas formulações explícita e implícita. Neste contexto, temos especial interesse na formulação implícita, objetivando o enfraquecimento da restrição de estabilidade par
Publicado em: 2009
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6. High-order finite volume method for solving viscoelastic fluid lows
Computational Fluid Dynamics (CFD) is widely used by polymer processing industries in order to evaluate polymeric fluid flows. A successful computational code must provide reliable predictions (modeling) in a fast and efficient way (simulation). In this work, a new approach to solve the governing equations of viscoelastic fluid flows is proposed. It is based
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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7. Modeling of dynamic rotors with flexible bearings due to the use of viscoelastic materials
Nowadays rotating machines produce or absorb large amounts of power in relatively small physical packages. The fact that those machines work with large density of energy and flows is associated to the high speeds of rotation of the axis, implying high inertia loads, shaft deformations, vibrations and dynamic instabilities. Viscoelastic materials are broadly
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-03
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8. ANÁLISE DE ESTABILIDADE DE ESCOAMENTOS VISCOSOS E VISCOELÁSTICOS / LINEAR STABILITY ANALYSIS OF VISCOUS AND VISCOELASTIC FLOWS
Steady state,two-dimensional flows may become unstable under two and three-dimensional disturbances, if the flow parameters exceed some critical values. In many practical situations, determining the parameters at which the flow becomes unstable is essential. The complete understanding of viscous and viscoelastic flows requires not only the steady state solut
Publicado em: 2007
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9. COMPORTAMENTO ELONGACIONAL DOS MATERIAIS TERMOPLÁSTICOS COMPÓSITOS / ELONGATIONAL BEHAVIOR OF COMPOSITE THERMOPLASTIC MATERIALS
Composite thermoplastic materials, like glass fiber reforced polypropropylene, are used increasingly in several industries. In particular, glass fiber reinforcement is used to improve the mechanical properties of thermoplastics, due to the high fiber modulous and to the better adesion between the fibers and the polymeric matrix. However, few data of material
Publicado em: 2007
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10. Solução numérica do modelo PTT para escoamentos viscoelásticos com superfícies livres / Numerical solution of the PTT model for viscoelastic surface flows
The aim of this work is to develop a numerical method capable of simulating viscoelastic free surface flows governed by the non-linear constitutive equation PTT (Phan-Thien-Tanner). In this work three numerical methods to simulate vicoelastic Flows of fluids modelled by the PTT equation are presented. Two of these methods were developed to simulate two-dimen
Publicado em: 2006
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11. Study of lineal and non lineal viscoelastic behavior of PP/PA-6 polymer blends compatibilized or no. / Estudo da viscoelasticidade linear e não linear de misturas de PP/PA-6 compatibilizadas ou não.
Rheological and morphological behaviour of polypropylene and polyamide polymer blend was studied. The values of interfacial tension were obtained between 10mN/m and 13mN/m. The interfacial tension decreased in 87% for compatibilized blend. Morphology analysis for linear viscoelastic regime shows dispersed drop diameter between 1,5µm and 20µm. The diameter
Publicado em: 2006
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12. CARACTERIZAÇÃO DO ESCOAMENTO DE LÍQUIDOS VISCOELÁSTICOS NO PROCESSO DE REVESTIMENTO POR ROTAÇÃO DIRETA / FILM - SPLITTING FLOWS OF VISCOELASTIC LIQUIDS VISUALIZATION
Roll coating is a common method in the manufacture of a wide variety of products. It is used to apply a thin liquid layer to a continuous flexible substrate. At low speeds, the flow is two-dimensional and steady; as the roll speed is raised, the two-dimensional flow is unstable and is replaced by a steady three-dimensional flow, which results in more or less
Publicado em: 2005