Pseudoplastic
Mostrando 37-48 de 66 artigos, teses e dissertações.
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37. Estudo reologico dos amidos de amaranto, de mandioca e de suas misturas, sob condições de acidez e tratamento termico / Rheological study of cassava and amaranth starches and their blends under heat treatment and acidity
Starch has been widely used as a thickener, stabilizer or gelling ingredients in the food like soups, sauces, snacks, canned and refrigerated food products. In this foods processing, starch dispersion are often heated, cooled and pumping at a wide range of shear rate. In many foods, sours substances (various acids) are added to foods as acidulents or preserv
Publicado em: 2008
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38. ESCOAMENTO DE LÍQUIDO PSEUDO-PLÁSTICO ATRAVÉS DE CAPILAR COM GARGANTA / FLOW OF PSEUDO-PLASTIC LIQUID THROUGH CAPILLARY TUBES WITH THROAT
Due to its application on a large number of fields and activities which are vital for the modern world, being oil prospection one of them, the flow of fluids on porous media have been studied in many experimental works and theoretical pieces. For instance, regarding the recovery of oil fields, it is challenging to predict the behavior of fluids that will be
Publicado em: 2007
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39. Modelagem mecânica e aproximação de Galerkin mínimos quadrados de escoamentos axissimétricos de fluídos pseudoplásticos sujeitos a efeitos de inércia / Mechanical modeling and galerkin least-squares approximations for axisimmetric flows of pseudoplastic fluids subjected to inertiaeffects
Existe um grande interesse no entendimento de escoamentos de fluidos não-Newtonianos através de contrações abruptas. Este interesse se origina na importância destes escoamentos em processos poliméricos e no freqüente uso do escoamento com contração abrupta como um problema teste para validação de métodos numéricos. As duas propriedades reológic
Publicado em: 2007
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40. A finite element formulation for pseudoplastic flows / Uma formulação de elementos finitos para problemas de escoamentos pseudoplásticos
In this thesis, a stabilized mixed finite element formulation is presented, with continuous velocity and discontinuous pressure interpolations, for incompressible flow problems of pseudoplastic dominated non-Newtonian fluids. Difficulties in constructing approximations by classical formulations are discussed and numerical results are also presented for them.
Publicado em: 2006
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41. Revulcanização de rejeito industrial de copolímero de butadieno e estireno (SBR)
The objective of this work was to develope and characterize SBR industrial scraps vulcanizable formulations with technological applications. Firstly, SBR scraps were collected in accordance with the standard NBR 10007. Then, they were ground in equipments available at the Laboratório de Polímeros of the Universidade de Caxias do Sul. The obtained powder (S
Publicado em: 2006
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42. Thermo-fluid dynamics to pseudoplastic fruit juices in cilindrical ducts and concentric annuli. / Termofluidodinamica de sucos de frutas pseudoplasticos em dutos cilindricos e anulos concentricos.
As mais importantes aplicações técnicas dos fatores de atrito e dos coeficientes convectivos de transferência de calor, bem como das propriedades térmicas e reológicas, estão nas análises e projetos de bombas, tubulações e trocadores de calor. Os dutos circulares e anulares constituem uma importante configuração geométrica para as indústrias e,
Publicado em: 2006
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43. Rheological properties of alumina injection feedstocks
The rheological behavior of alumina molding feedstocks containing polyethylene glycol (PEG), polyvinylbutyral (PVB) and stearic acid (SA) and having different powder loads were analyzed using a capillary rheometer. Some of the feedstocks showed a pseudoplastic behavior of n < 0, which can lead to the appearance of weld lines on molded parts. Their viscosity
Materials Research. Publicado em: 2005-06
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44. ESCOAMENTO DE UM LÍQUIDO PSEUDOPLÁSTICO EM ESPAÇO ANULAR COM EXCENTRICIDADE VARIÁVEL / FLOW OF PSEUDOPLASTIC FLUID IN ANNULAR WITH VARIABLE ECCENTRICITY
O estudo de escoamentos em espaço anular é de fundamental importância para o entendimento e otimização do processo de perfuração de poços. A lama de perfuração deve possuir propriedades reológicas e termofísicas tais que garantam um bom desempenho no carreamento de cascalho, na lubrificação e refrigeração das brocas, na limpeza do poço, manu
Publicado em: 2005
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45. Produção de Goma xantana empregando caldo de cana por xanthomonas campestris pv campestris NRRL B-1459
The development of the work plan proposed for this dissertation refers to the production of xanthan gum from sugarcane juice using the bacterium Xanthomonas campestris pv. campestris NRRL B-1459. Tests were conducted in 500 mL erlenmeyers flasks and in a 2.0-L reactor, in sucrose concentration range from 15 to 40 g/L, judiciously following the pre-establishe
Publicado em: 2005
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46. Dental ceramics and the molar crown testing ground
All ceramic crowns are highly esthetic restorations and their popularity has risen with the demand for life-like and cosmetic dentistry. Recent ceramic research has concentrated on developing a fundamental understanding of ceramic damage modes as influenced by microstructure. Dental investigations have elucidated three damage modes for ceramic layers in the
Journal of Applied Oral Science. Publicado em: 2004
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47. A numerical solution for the entrance region of non-newtonian flow in annuli
Continuity and momentum equations applied to the entrance region of an axial, incompressible, isothermal, laminar and steady flow of a power-law fluid in a concentric annulus, were solved by a finite difference implicit method. The Newtonian case was solved used for validation of the method and then compared to reported results. For the non-Newtonian case a
Brazilian Journal of Chemical Engineering. Publicado em: 2003-06
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48. UTILIZAÇÃO DE PARÂMETROS REOLÓGICOS PARA VERIFICAR A APTIDÃO AO DESAGUAMENTO DE LODOS DE UMA ESTAÇÃO DE TRATAMENTO DE ESGOTOS DO TIPO UASB + BFs CONDICIONADOS COM POLIELETRÓLITOS
This research aims at the rheological description of the sludge produced by an UASB + BAF wastewater treatment works and evaluates the application of the rheological parameters on the selection of polyeletrolyts, and its optimal dose, used to increase the sludges dehydration ability. The tests with raw sludge included rotational rheo-viscosimetry, cup with a
Publicado em: 2003