Non Newtonian Fluids
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. Study of Continuous Rheological Measurements in Drilling Fluids
Abstract Drilling an oil well involves using drilling fluids that perform cleaning and cooling functions, but that most importantly maintain the fluids of the geological formation contained by hydraulic pressure. A fundamental role in predicting the hydraulic pressure of the well consists of monitoring the fluid’s rheological behavior. This paper summarize
Braz. J. Chem. Eng.. Publicado em: 2017-07
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2. NUMERICAL INVESTIGATION OF NON-NEWTONIAN DRILLING FLUIDS DURING THE OCCURRENCE OF A GAS KICK IN A PETROLEUM RESERVOIR
Abstract In this work, a simplified kick simulator is developed using the ANSYS® CFX software in order to better understand the phenomena called kick. This simulator is based on the modeling of a petroleum well where a gas kick occurs. Dynamic behavior of some variables like pressure, viscosity, density and volume fraction of the fluid is analyzed in the fi
Braz. J. Chem. Eng.. Publicado em: 2016-06
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3. MODELING AND ANALYSIS OF UNSTEADY FLOW BEHAVIOR IN DEEPWATER CONTROLLED MUD-CAP DRILLING
Abstract A new mathematical model was developed in this study to simulate the unsteady flow in controlled mud-cap drilling systems. The model can predict the time-dependent flow inside the drill string and annulus after a circulation break. This model consists of the continuity and momentum equations solved using the explicit Euler method. The model consider
Braz. J. Chem. Eng.. Publicado em: 2016-03
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4. The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli
Helical flow in an annular space occurs during oil drilling operations. The correct prediction of flow of drilling fluid in an annular space between the wellbore wall and the drill pipe is essential to determine the variation in fluid pressure within the wellbore. This paper presents experimental and CFD simulation results of the pressure drop in the flow of
Braz. J. Chem. Eng.. Publicado em: 2014-12
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5. An investigation of the behavior of a classifying hydrocyclone with pseudoplastic fluids
The procedure usually employed for specifying a set of hydrocyclones used in Newtonian fluid-solid separation processes can be extended to the case of non-Newtonian fluids. The apparent viscosity, µapp, is the link between the two cases, and can be evaluated from the knowledge of the shear stress function, S, and the characteristic rate of shear, λ*. In or
Braz. J. Chem. Eng.. Publicado em: 2013-12
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6. Distribuição do tempo de residência e letalidade no processamento térmico contínuo de líquidos com escoamento laminar não ideal em trocadores bitubulares. / Residence time distribution and lethality in the continuous thermal processing of liquids with non ideal laminar flow in bitubular exchangers.
Tubular heat exchangers are widely used for thermal processing of viscous liquid foods because they have larger hydraulic diameters than the plate heat exchangers. The calculation of lethality in this type of exchanger is directly related to velocity profile and the residence time distribution (RTD). For the laminar flow of viscous fluids, Newtonian and non-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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7. Second law analysis for free convection in non-newtonian fluids over a horizontal plate embedded in a porous medium: (prescribed heat flux)
Second law characteristics of heat transfer and fluid flow due to free convection of non-Newtonian fluids over a horizontal plate with prescribed surface heat flux in a porous medium are analyzed. Velocity and temperature fields are obtained numerically using an implicit finite difference method under the similarity assumption and these results are used to c
Braz. J. Chem. Eng.. Publicado em: 2012-09
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8. Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system
The flow of non-Newtonian fluids in rectangular open channels has received renewed interest over the past number of years especially as large flumes are being used to transport tailings in countries like Chile. The effect of yield stress on the flow behavior is complex and not yet fully understood. The Ultrasonic Velocity Profiling (UVP) technique has been u
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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9. Experimental investigation of the enhanced oil recovery process using a polymeric solution
Enhanced oil recovery methods are becoming an important source of oil production of wells that have already been explored and, by these methods, of increase of the total volume of oil extracted. An important example is the injection of polymeric solutions after the injected water has reached the breakthrough point. In the present work an experimental apparat
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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10. Numerical experimental comparison of dam break flows with non-Newtonian fluids
The dam-break flow involving non-Newtonian fluids is a type of flow commonly observed in nature as well as in common industrial processes. Experiments of non-Newtonian dam-break flows were conducted in horizontal channels and aqueous solutions of Carbopol 940 were used, which were modeled by the Herschel-Bulkley constitutive equation. Their flows were filmed
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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11. The viscosity distribution around a rising bubble in shear-thinning non-newtonian fluids
The viscosity distribution of the liquid around a rising bubble in carboxymethyl cellulose (CMC) aqueous solutions was measured experimentally by particle image velocimetry (PIV). The effect of the concentration of CMC solutions on the viscosity distribution around a bubble and the coupling relations between the viscosity field, flow field and shear stress f
Brazilian Journal of Chemical Engineering. Publicado em: 2012-06
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12. Modelagem do processo térmico contínuo de fluidos alimentícios não-newtonianos em trocador de calor bitubular. / Modeling of the continuous thermal processing of non-Newtonian food fluids in a double-pipe heat exchanger.
A demanda por produtos industrializados que apresentem máxima preservação de suas características naturais têm crescido e feito as indústrias alimentícias re-analisarem seus processos para atingirem essa necessidade do mercado. A abordagem convencional conservadora, utilizada para o dimensionamento do processamento térmico de alimentos, pode levar ao
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/10/2011