Viscoelastic Flow
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. 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
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14. DISPLACEMENT OF VISCOELASTIC LIQUIDS IN CAPILLARY TUBES / DESLOCAMENTO DE LÍQUIDOS VISCOELÁSTICOS EM TUBOS CAPILARES
O deslocamento de um líquido em um tubo capilar pela injeção de um gás ocorre em muitas situações, tais como na recuperação avançada de petróleo, no revestimento de conversores catalíticos e na moldagem assistida por injeção de gás. Geralmente o líquido deslocado é uma solução polimérica ou uma dispersão, que é não Newtoniana. Forças v
Publicado em: 2005
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15. Proteins with mechanical functionality: a physico-chemical study on the viscoelasticity of gliadin, a storage protein from wheat gluten / Proteínas com funcionalidade mecânica: um estudo físico-químico sobre a viscoelasticidade da gliadina, uma proteína de reserva do glúten do trigo
The thesis consisted in a rheological study of the dynamics of gels and dispersions of gliadin from wheat gluten in pure dimethylsulfoxide, dimethylformamide or formamide and in their mixtures with water. The effect of temperature and that of the concentration of the component species (protein and solvent constituents) on flow behavior and deformation were e
Publicado em: 2004
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16. Anionic collagen : rhamsan composites as injectable biomateriais : characterization and interaction mechanism / Compósitos colágeno aniônico : ramsana como biomateriais injetáveis : caracterização e mecanismo de interação
This work describes the preparation, characterization and mechanisms of interaction anionic collagen:rhamsam composites, with the purpose of developing injectable gels for plastic corrections with similar concentrations to the commercially founded without the use of glutaraldehyde. The materials were characterized by electrophoresis, infrared spectroscopy, t
Publicado em: 2003
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17. ESTABILIDADE DO ESCOAMENTO VISCOELÁSTICO EM PROCESSO DE REVESTIMENTO POR ROTAÇÃO DIRETA / STABILITY OF VISCOELASTIC FORWARD ROLL COATING FLOWS
O processo de revestimento por rotação é caracterizado pelo uso de cilindros girantes para controlar a espessura e aplicar uma fina camada de líquido em um substrato em movimento. A não ser a baixas velocidades dos cilindros, o escoamento bi-dimensional na região de formação dos filmes sobre cada cilindro é instável e o padrão observado experiment
Publicado em: 2003
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18. Estudo das interações entre biopolimeros e polpas de frutas tropicais em cisalhamento estacionario e oscilatorio
The rheological behavior of guar and xanthan gums in passion tfuit pulp was evaluated by means of shear flow and oscillatory shear tests. Herschel-Bulckley model represented successfully biopolymers flow behavior and Cross model was used to describe those behaviors in a broad shear stress range. In pulp tfuit systems, xanthan gum showed more pseudoplasticity
Publicado em: 2002
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19. Evaluation of the red cell deformability through ektacytometry in iron deficiency / Avaliação da deformidade eritrocitária através da ectacitometria na deficiência de ferro
The deformability allows the 7 to 8 cm red cell to circulate through capillaries of 3 cm. This phenomenon depends on cellular geometry, internal viscosity and viscoelastic properties of the membrane. Among the various techniques of erytrocyte deformability (ED) analysis such as: micropipette aspiration, filtration and reoscopy, we chose ektacytometry. This t
Publicado em: 2002
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20. An alternative finite element formulation for determination of streamlines in two-dimensional problems
It is well known that the numerical solutions of incompressible viscous flows are of great importance in Fluid Dynamics. The graphics output capabilities of their computational codes have revolutionized the communication of ideas to the non-specialist public. In general those codes include, in their hydrodynamic features, the visualization of flow streamline
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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21. DYNAMICS OF RELATIVE MOTION BETWEEN SOLID PARTICLES AND NON-NEWTONIAN FLUIDS / DINÂMICA DO MOVIMENTO RELATIVO ENTRE PARTÍCULAS SÓLIDAS E FLUIDOS NÃO-NEWTONIANOS
This work describes experiments related to relative motion between solid particles and mon-newtonian fluid, inside a circular duct. Measurements of the aditional dynamic pressure, due to the presence of the particle (a source of disturbance in the flow) ando f the viscous drag, were conducted to verify the validity of Brenner¿s Theory (1962). This theory, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/04/1987
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22. Actin-Myosin Viscoelastic Flow in the Keratocyte Lamellipod
The lamellipod, the locomotory region of migratory cells, is shaped by the balance of protrusion and contraction. The latter is the result of myosin-generated centripetal flow of the viscoelastic actin network. Recently, quantitative flow data was obtained, yet there is no detailed theory explaining the flow in a realistic geometry. We introduce models of vi
The Biophysical Society.
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23. Regional lung clearance during cough and forced expiration technique (FET): effects of flow and viscoelasticity.
BACKGROUND--In vitro studies have suggested that both the viscoelastic properties of lung secretions and the peak flow attained during simulated cough influence clearance. This study examines the possible association of the viscoelastic properties of sputum and maximum expiratory flow with measured effectiveness of mucus clearance induced by instructed cough
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24. Viscoelastic evaluation of topical creams containing microcrystalline cellulose/sodium carboxymethyl cellulose as stabilizer
The purpose of this study was to examine the viscoelastic properties of topical creams containing various concentrations of microcrystalline cellulose and sodium carboxymethyl cellulose (Avicel® CL-611) as a stabilizer. Avicel CL-611 was used at 4 different levels (1%, 2%, 4%, and 6% dispersion) to prepare topical creams, and hydrocortisone acetate was used
Springer-Verlag.