Relevant bibliographies by topics / Pseudoplastic fluid

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Pseudoplastic fluid'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Pseudoplastic fluid"

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Lim, Elaine, and Yew Mun Hung. "Long-wave evolution model of thermocapillary convection in an evaporating thin film of pseudoplastic fluids." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 12 (December 2, 2019): 4764–87. http://dx.doi.org/10.1108/hff-01-2019-0003.

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Purpose By solving a long-wave evolution model numerically for power-law fluids, the authors aim to investigate the hydrodynamic and thermal characteristics of thermocapillary flow in an evaporating thin liquid film of pseudoplastic fluid. Design/methodology/approach The flow reversal attributed to the thermocapillary action is manifestly discernible through the streamline plots. Findings The thermocapillary strength is closely related to the viscosity of the fluid, besides its surface tension. The thermocapillary flow prevails in both Newtonian and pseudoplastic fluids at a large Marangoni number and the thermocapillary effect is more significant in the former. The overestimate in the Newtonian fluid is larger than that in the pseudoplastic fluid, owing to the shear-thinning characteristics of the latter. Originality/value This study provides insights into the essential attributes of the underlying flow characteristics in affecting the thermal behavior of thermocapillary convection in an evaporating thin liquid film of the shear-thinning fluids.
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Singh, Udaya P., and Ram S. Gupta. "Non-Newtonian Effects on the Squeeze Film Characteristics between a Sphere and a Flat Plate: Rabinowitsch Model." Advances in Tribology 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/571036.

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The use of additives (polyisobutylene, ethylene-propylene, lithium hydroxy stearate, hydrophobic silica, etc.) changes lubricants’ rheology due to which they show pseudoplastic and dilatant nature, which can be modelled as cubic stress fluid model (Rabinowitsch fluid model). The present theoretical analysis investigates the effects of non-Newtonian pseudoplastic and dilatant lubricants on the squeezing characteristics of a sphere and a flat plate. The modified Reynolds equation has been derived and an asymptotic solution for film pressure is obtained. The results for the film pressure distribution, load carrying capacity, and squeezing time characteristics have been calculated for various values of pseudoplastic parameter and compared with the Newtonian results. These characteristics show a significant variation with the non-Newtonian pseudoplastic and dilatant behavior of the fluids.
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Singh, Udaya, Ram Gupta, and Vijay Kapur. "Effects of inertia in the steady state pressurised flow of a non-Newtonian fluid between two curvilinear surfaces of revolution: Rabinowitsch fluid model." Chemical and Process Engineering 32, no. 4 (December 1, 2011): 333–49. http://dx.doi.org/10.2478/v10176-011-0027-1.

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Effects of inertia in the steady state pressurised flow of a non-Newtonian fluid between two curvilinear surfaces of revolution: Rabinowitsch fluid modelIn many practical situations fluids are normally blended with additives (viscosity index improvers, viscosity thickeners, viscosity thinners) due to which they show pseudoplastic and dilatant nature which can be modelled as cubic stress model (Rabinowitsch model). The cubic stress model for pseudoplastic fluids is adopted because Wada and Hayashi have shown that the theoretical results with this model are in good agreement with the experimental results. The present theoretical analysis is to investigate the pseudoplastic effect along with the effect of rotational inertia on the pressure distribution, frictional torque and fluid flow rate of externally pressurised flow in narrow clearance between two curvilinear surfaces of revolution. The expression for pressure has been derived using energy integral approach. To analyse and discuss the effects of pseudoplasticity and fluid inertia on the pressure distribution, fluid flow rate and frictional torque, the examples of externally pressurised flow in the clearance between parallel disks and concentric spherical surfaces have been considered.
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Saravana, R., K. Vajravelu, and S. Sreenadh. "Influence of Compliant Walls and Heat Transfer on the Peristaltic Transport of a Rabinowitsch Fluid in an Inclined Channel." Zeitschrift für Naturforschung A 73, no. 9 (September 25, 2018): 833–43. http://dx.doi.org/10.1515/zna-2018-0181.

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AbstractIn this paper, we investigate the peristaltic pumping of a Rabinowitsch fluid in an inclined channel under the effects of heat transfer and flexible compliant walls. The expressions for the velocity, the temperature and the coefficient of the heat transfer are obtained. The influence of emerging parameters on the velocity, the temperature, the coefficient of heat transfer and the trapping phenomenon of the Newtonian, dilatant and pseudoplastic fluid models are also analyzed graphically. We find that the velocity and the temperature fields decrease for shear thickening fluid; but the velocity and temperature fields of the shear thinning, and Newtonian fluids increase with an increase in the angle of inclination. Furthermore, there were more trapping boluses occurring for the Newtonian fluid case as compared to the pseudoplastic and dilatant fluids cases. However, as the angle of inclination increases, the size of trapping bolus decreases.
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Pratap Singh, Udaya. "Application of Rabinowitsch Fluid Model to Pivoted Curved Slider Bearings." Archive of Mechanical Engineering 60, no. 2 (June 1, 2013): 247–67. http://dx.doi.org/10.2478/meceng-2013-0016.

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In the present theoretical analysis, the combined effects of slider curvature and non-Newtonian pseudoplastic and dilatant lubricants (lubricant blended with viscosity index improver) on the steady and dynamic characteristics of pivoted curved slider bearings have been investigated for Rabinowitsch fluid model. The modified Reynolds equations have been obtained for steady and damping states of bearing. To solve the modified Reynolds equations, perturbation theory has been adopted. The results for the steady state characteristics (steady state film pressure, load carrying capacity and centre of pressure) and dynamic characteristics (dynamic damping and dynamic stiffness) have been calculated numerically for various values of viscosity index improver using Mathematica. In comparison with the Newtonian lubricants, higher values of film pressure, load carrying capacity, dynamic damping and dynamic stiffness have been obtained for dilatant lubricants, while the case was reversed for pseudoplastic lubricants. Significant variations in the bearing characteristics have been observed for even small values of pseudoplastic parameter, that is, with the non-Newtonian dilatant and pseudoplastic behaviour of the fluid.
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Tahir, Muhammad, and Adeel Ahmad. "Impact of pseudoplaticity and dilatancy of fluid on peristaltic flow and heat transfer: Reiner-Philippoff fluid model." Advances in Mechanical Engineering 12, no. 12 (December 2020): 168781402098118. http://dx.doi.org/10.1177/1687814020981184.

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The objective of this article is to investigate the impact of pseudoplaticity and dilatancy of fluid on peristaltic flow and heat transfer of non-Newtonian fluid in a non-uniform asymmetric channel. The mathematical-model incorporates the non-linear implicit stress deformation relation using the classical Reiner-Philippoff viscosity model, which is one of the very few non-Newtonian models exhibiting all the pseudoplastic, dilatant and Newtonian behaviors. The governing equations for the peristaltic flow and heat transfer of Reiner-Philippoff fluid are modeled using the low Reynolds-number and long wavelength approximation. Results of the study are presented graphically to discuss the impact of pseudoplaticity and dilatancy of fluid on the velocity, pressure gradient, bolus movement and temperature profile. The article is concluded with key observations that by increasing the value of the Reiner-Philippoff fluid parameter the velocity of fluid increase at the center of the channel and decreases near the boundaries of the channel. Effects of the shear stress parameter are opposite on pseudoplastic and dilatants fluid. By increasing the value of the shear stress parameter the velocity of the pseudoplastic fluid increases near the center of the channel, whereas the velocity of dilatants fluid decreases.
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Kadyirov, A. I., and B. R. Abaydullin. "Vortex Breakdown under Laminar Flow of Pseudoplastic Fluid." Journal of Physics: Conference Series 899 (September 2017): 022009. http://dx.doi.org/10.1088/1742-6596/899/2/022009.

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Dongxue, Li, Su Yufeng, Xia Weiwei, Liu Chaoran, Wang Wen, Wang Pan, and Duan Zhiyong. "Analysis of slumping on nanoimprint patterning with pseudoplastic metal nanoparticle fluid." RSC Adv. 4, no. 57 (2014): 30402–11. http://dx.doi.org/10.1039/c4ra01138d.

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Humberto Escobar, Freddy, Javier-Andrés Martínez, and Luis-Fernando Bonilla. "Transient pressure analysis for vertical wells with spherical power-law flow." CT&F - Ciencia, Tecnología y Futuro 5, no. 1 (November 30, 2012): 19–36. http://dx.doi.org/10.29047/01225383.216.

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Heavy oil is considered nowadays as one of the unconventional reservoirs of main interest in the oil industry. Some of them display non-Newtonian pseudoplastic behavior which mathematical modeling differs from the conventional case and, therefore, the flow regimes display some particular behaviors.Fracturing fluids, foams, some fluids for Enhanced Oil Recovery (EOR) and drilling muds can also fall into this category. The spherical/hemispherical flow mainly caused by partial completion/penetration deserves a particular treatment for pseudoplastic flow. A single research for this case was found in the literature to introduce only its mathematical model. The pressure and pressure derivative behavior of spherical/hemispherical flow behavior of a slightly compressible, non-Newtonian power-law fluid (pseudoplastic) is studied in this work and conventional and Tiab’s Direct Synthesis (TDS) methodologies are extended for well test interpretation purposes. For pseudoplastic spherical/ hemispherical flow, the slope of the pressure derivative is no longer -½, besides it changes with the value of flow behavior index n, which indicates that the interpretation of pressure data for the dealt systems through the use of traditional methods should not be accurate. New Equations are introduced to estimate spherical/ hemispherical permeability and spherical/hemispherical skin factor for the systems under consideration. The Equations were successfully verified by its application to synthetic cases.
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Ayoubi Ayoubloo, Kasra, Mohammad Ghalambaz, Taher Armaghani, Aminreza Noghrehabadi, and Ali J. Chamkha. "Pseudoplastic natural convection flow and heat transfer in a cylindrical vertical cavity partially filled with a porous layer." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 3 (September 30, 2019): 1096–114. http://dx.doi.org/10.1108/hff-06-2019-0464.

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Purpose This paper aims to theoritically investigate the free convection flow and heat transfer of a non-Newtonian fluid with pseudoplastic behavior in a cylindrical vertical cavity partially filled with a layer of a porous medium. Design/methodology/approach The non-Newtonian behavior of the pseudoplastic liquid is described by using a power-law non-Newtonian model. There is a temperature difference between the internal and external cylinders. The porous layer is attached to the internal cylinder and has a thickness of D. Upper and lower walls of the cavity are well insulated. The governing equations are transformed into a non-dimensional form to generalize the solution. The finite element method is used to solve the governing equations numerically. The results are compared with the literature results in several cases and found in good agreement. Findings The influence of the thickness of the porous layer, Rayleigh number and non-Newtonian index on the heat transfer behavior of a non-Newtonian pseudoplastic fluid is addressed. The increase of pseudoplastic behavior and increase of the thickness of the porous layer enhances the heat transfer. By increase of the porous layer from 0.6 to 0.8, the average Nusselt number increased from 0.15 to 0.25. The increase of non-Newtonian effects (decrease of the non-Newtonian power-law index) enhances the heat transfer rate. Originality/value The free convection behavior of a pseudoplastic-non-Newtonian fluid in a cylindrical enclosure partially filled by a layer of a porous medium is addressed for the first time.
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Dissertations / Theses on the topic "Pseudoplastic fluid"

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TARAZONA, VICTOR MANUEL CARDENAS. "FLOW OF PSEUDOPLASTIC FLUID IN ANNULAR WITH VARIABLE ECCENTRICITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8743@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
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, manutenção da pressão da coluna de líquido para equilibrar a pressão das formações atravessadas e estabilizar as paredes do poço. Uma análise completa desta situação é extremamente complexa; o cilindro interno (coluna) pode estar girando, a geometria da parede do poço não é um cilindro perfeito, o espaço anular é excêntrico e a excentricidade varia ao longo do poço. Além disto, lamas de perfuração possuem um comportamento pseudoplástico, isto é a viscosidade é função decrescente da taxa de deformação. Os modelos que levam em conta todos esses fatores são extremamente complexos e caros computacionalmente. Os modelos disponíveis na literatura utilizam hipóteses simplificadoras para tornar a análise menos complexa. Muitos trabalhos consideram a rotação do cilindro interno e o comportamento não Newtoniano, mas desprezam a variação da excentricidade ao longo do poço. Mesmo com esta simplificação, os modelos apresentados, que consistem na solução da equação bidimensional para determinar o campo de velocidade axial e tangencial do escoamento desenvolvido em um espaço anular, possuem alto custo computacional. O modelo apresentado neste trabalho leva em conta a variação da excentricidade ao longo do poço, bem como o comportamento pseudoplástico da lama e a rotação do cilindro interno. As equações que governam o problema foram simplificadas utilizando a teoria de lubrificação. As equações diferenciais parciais que descrevem o perfil de velocidade e a pressão ao longo do poço foram resolvidas pelo método de diferenças finitas (diferenças centrais) e linearizadas pelo método de Newton. O modelo de lubrificação foi validado através da comparação dos resultados obtidos com trabalhos na literatura para escoamentos com excentricidade constante. Os resultados mostram o efeito da variação da excentricidade ao longo do poço, da rotação na coluna, das propriedades não Newtonianas no padrão do escoamento e no fator de atrito.
Helical flow in annular space occurs in drilling operation of oil and gas wells. The correct prediction of the flow of the drilling mud in the annular space between the wellbore wall the the drill pipe is essential to determine the variation in the mud pressure within the wellbore, the frictional pressure drop and the efficiency of the transport of the rock drill cuttings. A complete analysis of this situation is extremely complex; the inner cylinder is usualy rotating, the wellbore wall will depart significantly from cylindrical, during driling operation the drill pipe is eccentric, and the eccentricity varies with position along the well. Moreover, drilling muds present pseudoplastic behavior, the viscosity is a strong function of the deformation rate. A complete analysis of this situation would require the solution of the three-dimensional momentum equation and would be computationally expensive and complex. Models available in the literature to study this situation do consider the rotation of the inner cylinder and the non Newtonian behavior of the liquid, but assume the position of the inner and outer cilinders fixed, i.e. they neglect the variation of the eccentricity along the length of the well, and assume the flow to be well developed. This approximation leads to a two-dimensional model to determine the three components of the velocity field in a cross-section of the annulus. The resulting differential equations have to be solved by some numerical method. The model presented in this work takes into account the variation of the eccentricity along the well; a more appropriate description of the geometric configuration of directional wells. As a consequence, the velocity field varies along the well length and the resulting flow model is three-dimensional. Lubrication theory is used to simplify the governing equations into a non-linear, two-dimensional Poisson Equation that describes the pressure field. Lubrication model was validated by comparing the predictions to reported results on fully developed flow on eccentric annular space. The results show the effect of varying eccentricity, non Newtonian behavior and inner cylinder rotation on the flow field and on the friction factor.
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Azevedo, Cardoso Ivan. "Lois d'échange lors du refroidissement d'un fluide non newtonien thermo-dépendant." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL045N.

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Le présent travail se propose d'étudier expérimentalement et numériquement les lois de l'écoulement et du transfert de chaleur pour des fluides non-newtoniens thermo-dépendants en écoulement laminaire dans une conduite cylindrique, refroidie à densité de flux de chaleur et à températures de paroi variables. Nous nous intéressons aux fluides pseudoplastiques dont le comportement peut être modifié par la loi de puissance d'Ostwald. On étudie l'incidence d'un champ thermique impose sur la distribution de vitesse et sur les lois de transfert de chaleur qui en résultent. Nous proposons une corrélation qui tient compte de la thermo-dépendance. En outre, nous proposons un modèle de calcul de l'épaisseur de la couche de glace pour les régions ou se produit la congélation
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Zang, Yong Hua. "Contribution a l'etude des proprietes viscoelastiques de caoutchoucs reticules et de liquides polystyrenes." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13225.

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Les mesures experimentales ont ete effectuees en cisaillement dynamique et en extension uniaxiale. La viscosite limite depend de la masse moleculaire moyenne en poids. La complaisance recouvrable peut etre decrite par une loi de melange. La frequence critique et le module de perte critique correspondant au passage du comportement newtonien au comportement pseudoplastique ont ete relies aux moments de la distribution des masses moleculaires. Cette etude conduit a un nouveau type de relation entre la contrainte et la deformation
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Gratão, Ana Carolina Amaral. "Termofluidodinamica de sucos de frutas pseudoplasticos em dutos cilindricos e anulos concentricos." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255776.

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Orientadores: Vivaldo Silveira Junior, Javier Telis Romero
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos
Made available in DSpace on 2018-08-06T15:00:42Z (GMT). No. of bitstreams: 1 Gratao_AnaCarolinaAmaral_D.pdf: 2034155 bytes, checksum: 7a7cc4a961cab6b38ae3dc5ee5f3f9d8 (MD5) Previous issue date: 2006
Doutorado
Engenharia de Alimentos
Doutor em Engenharia de Alimentos
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Erdogan, Baris. "Production And Development Of De/anti Icing Fluids For Aircraft." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609926/index.pdf.

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Aircraft are not allowed to take off prior to cleaning of snow and ice deposits that form on their surfaces under winter conditions to refrain from compromising flight safety. Water based solutions containing mainly ethylene or propylene glycol, or both, are employed either to remove the snow/ice layers or to provide protection against deposition of these layers. The first group of solutions, i.e. de-icing fluids, are Newtonian and have generally low viscosity so that right after their application they fall off the aircraft surfaces, providing little or no further protection against precipitation. Therefore, various anti-icing solutions have then been developed to provide the prolonged protection due to their non-Newtonian and high viscosity characteristics. Although the appropriate ranges of viscosity and surface tension have been determined in a number of studies, actual compositions of these solutions are proprietary. The main objective of this study is to determine the basic interactions between the chemical species in de/anti-icing fluids and their effects on the physical properties of the solutions, especially viscosity, surface tension,freezing point and corrosive effect which enable the design of the de/anti icing fluid composition. A number of polymers and surfactants were dissolved in water-glycol solutions and used in different compositions to get the desired viscosity and surface properties. The dependence of viscosity on polymer concentration, pH of the solutions, glycol content, surfactant concentration, temperature and shear rate were investigated and reported in detail. Among various chemicals, slightly crosslinked and hydrophobically modified polyacrylic acid was utilized as a thickener, sodium oleate and tributyl amine were used as surface agents in the de/anti-icing solutions whose physical properties satisfied the desired requirements. In addition to the studies about de/anti icing solutions, synthesis of a new polymer namely poly (DADMAC-co-vinyl pyyrolidone) was made and its characterization and performance tests were performed. High swelling ratios (up to 360) were attained with 0.5 % crosslinker in 2-3 minutes. Moreover, swellings of the gels were demonstrated to be independent of pH. It was also thought that such a copolymer having anti-bacterial effect induced by DADMAC (Diallyldimethyl ammonium chloride) segments and biocompatability of NVP (N-vinyl pyyrolidone) component would be of interest in biorelated areas.
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Martyn, Michael T., R. Joseph, W. J. McGregor, K. E. Tanner, and Philip D. Coates. "Effect of polymer matrix on the rheology of hydroxapatite filled polyethylene composites." 2002. http://hdl.handle.net/10454/2944.

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The effect of matrix polymer and filler content on the rheological behavior of hydroxyapatite-filled injection molding grade high-density polyethylene (HDPE) has been studied. Studies of the flow curves revealed that the matrix and the composite exhibit three distinct regions in the flow curve, namely, a pseudoplastic region at low to moderate shear rates, a plateau and a second pseudoplastic region at high shear rates. The shear stress corresponding to the plateau (Tc) is dependent on both the filler concentration and the melt temperature. Addition of HA in the HDPE matrix increases the value of Tc and decreases compressibility of the melt. An increase in temperature also raises the value of Tc. From the nature of flow curves it is concluded that the matrix polymer largely decides the rheology of the composite.
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Books on the topic "Pseudoplastic fluid"

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Douillard, Gerald R. Time-averaged measurements of the velocity field of a pseudoplastic free jet. 1995.

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Book chapters on the topic "Pseudoplastic fluid"

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Gooch, Jan W. "Pseudoplastic Fluid." In Encyclopedic Dictionary of Polymers, 595. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9565.

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Silva-Zea, Roberto, Romel Erazo-Bone, Fidel Chuchuca-Aguilar, Ricardo Gallegos, Kenny Escobar-Segovia, and Ulises Gallegos Carrión. "Pseudoplastic Magnetorheological Fluid Flow on a Moving Horizontal Flat Plate." In Communications in Computer and Information Science, 56–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42517-3_5.

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"Pseudoplastic fluid." In Encyclopedic Dictionary of Polymers, 798. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_9387.

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"Pseudoplastic Fluid." In Encyclopedia of Lubricants and Lubrication, 1470. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_200380.

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Conference papers on the topic "Pseudoplastic fluid"

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Tamburrino, Aldo, Gonzalo Montserrat, and Christian Ihle. "Concentration Distribution of Solid Particles Transported by a Pseudoplastic Fluid." In The 2nd World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2016. http://dx.doi.org/10.11159/htff16.125.

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Hazbavi, A., N. Ashrafi, and M. Najafi. "Second Law Analysis of Heat Transfer in Taylor Couette Flow for Pseudoplastic Fluid." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62440.

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The Taylor Couette flow of pseudoplastic fluids is examined while dissipation due to viscous effects through the energy balance. The viscosity of fluid is simultaneously dependent on shear rate and temperature. Exponential dependence of viscosity on temperature is modeled through Nahme law and the shear dependency is modeled according to the Carreau equation. Hydrodynamically, stick boundary conditions are applied and thermally, both constant temperature and constant heat flux on the exterior of cylinders are considered. The governing motion and energy balance equations are coupled adding complexity to the already highly correlated set of differential equations. Introduction of Nahme number has resulted in a nonlinear base flow between the cylinders. As well, the condition of constant heat flux has moved the point of maximum temperature towards the inner cylinder. Taking viscous heating into account, the effects of parameters such as Nahme Number, Deborah Number, material time and pseudoplasticity constant on the heat transfer of the flow are investigated by second law analysis. Moreover, the study shows that the total entropy generation number decreases as the fluid elasticity increases. It, however, increases with increasing Nahme Number.
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Hazbavi, A., and N. Ashrafi. "Pseudoplastic Flow Between Concentric Rotating Cylinders With Viscous Dissipation." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87698.

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The rotational flow of pseudoplastic fluids between concentric cylinders is examined while dissipation due to viscous effects is taken into account. The viscosity of fluid is simultaneously dependent on shear rate and temperature. Exponential dependence of viscosity on temperature is modeled through Nahme law and the shear dependency is modeled according to the Carreau equation. Hydrodynamically, stick boundary conditions are applied and thermally, both constant temperature and constant heat flux on the exterior of cylinders are considered. The governing motion and energy balance equations are coupled adding complexity to the already highly correlated set of differential equations. Introduction of Nahme number has maintained a nonlinear base flow between the cylinders. As well, the condition of constant heat flux has moved the point of maximum temperature towards the inner cylinder. In the presence of viscous heating, the effect of parameters such as Nahme, Prandtl and Brinkman numbers, material time and pseudoplasticity constant on the stability of the flow is presented in terms of neutral stability curves. The flow parameters along with viscosity maps are given for different scenarios of the flow.
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Ihmoudah, Abdalsalam, Mohamed M. Awad, Mohammad Azizur Rahman, and Stephen D. Butt. "Effect of Rheological Properties of Yield Pseudoplastic Fluids on Slugs Characteristics in an Upward Vertical Pipe: Experiments and Modeling." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19082.

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Abstract Two-phase flow of gas/yield Pseudoplastic fluids can be found in different industrial applications like the chemical processes, oil industry, and petroleum transport in pipelines. In this study, experimental and numerical investigation of the influence of Rheological properties of non-Newtonians fluids in two-phase flow (gas/yield Pseudoplastic fluids) on slug characteristics in an upward vertical flow were performed. Different concentrations of Xanthan gum solutions (0.05%, 0.10%, and 0.15%, by w/w), which are referred to as non-Newtonian, yield Pseudoplastic behavior used as the working liquids and air as a gas. The experiments were conducted in an open-loop re-circulating system has a total length of 65 m to ensure phase mixing, and authorize flow regime patterns to develop. The vertical pipe has a diameter of 76.3 mm. API-compliant 8-speed rotational viscometer model 800 was used to measure the rheological properties of non-Newtonian fluids. Flow visualization and recording videos were achieved by A high-speed camera to a comparison between behavior of Newtonian and non-Newtonian fluids in the two-phase model. Pressure transducers used to measure high-response pressure. Computational fluid dynamics software (ANSYS fluent 2019 R3) was used for the numerical investigation. The volume of fluid (VOF) model has been chosen for tracking immiscible fluids. CFD simulation results compared to the experimental data. The slug behavior and shape were noticed to be affected by changing the rheological properties of the liquid phase. with increasing XG concentration at the same operations conditions, we found that non-uniform and random distribution of small bubbles due to the effective viscous force of a liquid phase.
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Khan, Waqar A., Richard J. Culham, and Milan M. Yovanovich. "Fluid Flow and Heat Transfer in Power-Law Fluids Across Circular Cylinders: Analytical Study." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79941.

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An integral approach of the boundary layer analysis is employed for the modeling of fluid flow around and heat transfer from infinite circular cylinders in power-law fluids. The Von Karman-Pohlhausenmethod is used to solve the momentum integral equation whereas the energy integral equation is solved for both isothermal and isoflux boundary conditions. A fourth-order velocity profile in the hydrodynamic boundary layer and a third-order temperature profile in the thermal boundary layer are used to solve both integral equations. Closed form expressions are obtained for the drag and heat transfer coefficients that can be used for a wide range of the power-law index, and generalized Reynolds and Prandtl numbers. It is found that pseudoplastic fluids offer less skin friction and higher heat transfer coefficients than dilatant fluids. As a result, the drag coefficients decrease and the heat transfer increases with the decrease in power-law index. Comparison of the analytical models with available experimental/numerical data proves the applicability of the integral approach for power-law fluids.
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6

Hammad, Khaled J. "Inflow Conditions and Heat Transfer From Suddenly Expanding Annular Pseudoplastic Flows." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72071.

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The impact of inflow conditions on flow and heat transfer in suddenly expanding annular pipe flows of a pseudoplastic fluid is studied within the steady laminar flow regime. The equations governing conservation of mass, momentum, and energy, along with the power-law constitutive model are numerically solved using a finite-difference numerical scheme. The influence of inflow conditions, annular-nozzle-diameter-ratio, k, power-law index, n, and Prandtl numbers, is reported for: Inflow Condition = {fully-developed, uniform}; κ = {0, 0.5}; n = {1, 0.6}; Re = {50}; Pr = {1, 10, 100}. Fully-developed inflows result in larger and more intense recirculation, which leads to higher wall heat transfer rates, in comparison with uniform inflows. Substantial heat transfer augmentation, downstream the plane of expansion, is only observed for Pr = 10 and 100.
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7

Metwally, Hossam M., and Raj M. Manglik. "Computational Modeling of Enhanced Laminar Flow Heat Transfer in Viscoplastic Fluids in Corrugated-Plate Channels." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33631.

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The enhanced heat transfer in laminar viscoplastic, shear thinning, Herschel-Bulkley fluid flows in sinusoidal corrugated-plate channels is investigated. With uniform-temperature plate walls, periodically developed flows are considered for a wide range of flow rates (10 ≤ Reg ≤ 700) and pseudoplastic flow behavior indices (n = 0.54, 0.8, and 1.0; the latter representing a Bingham plastic). The effects of fluid yield stress are simulated for the case where τy = 1.59 N/m2, representing a 0.5% xantham gum aqueous solution. Typical velocity and temperature distributions, along with extended results for isothermal friction factor ƒ and Colburn factor j are presented. The effect of the yield stress is found to be most dominant at low Reg regardless of the power law index n, and the recirculation or swirl in the wall trough regions is weaker than in the cases of Newtonian and power-law liquids. At higher Reg, the performance of the Herschel-Bulkley fluid asymptotically approaches that of the non-yield-stress power-law fluid. At low Reg, the yield stress increases ƒ by an order of magnitude and j is enhanced because of the higher wall gradients imposed by the plug-like flow field. The relative heat transfer enhancement, represented by the ratio (j/ƒ), and the role of the fluid yield stress and shear-thinning (or pseudoplastic) behaviors are also discussed.
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8

Gómez, Juan R., and Juan P. Escandón. "Combined Magnetohydrodynamic/Pressure Driven Flow of Multi-Layer Pseudoplastic Fluids Through a Parallel Flat Plates Microchannel." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86676.

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With the advance of microfluidic platforms and due to the need to solve different implications that still exist on the transport of electrically conducting fluids, the analysis on strategies in micropumps that involve a simplicity in its structure, absence of mechanical moving parts, flow reversibility and low power requirement is current. Therefore, the present investigation contributes with the analysis of the combined magnetohydrodynamic/pressure driven flow of multilayer immiscible fluids in a microchannel formed by two parallel flat plates. The mathematical model is based in a steady fully developed flow and the pumped fluids follow the power law model to describe the pseudoplastic fluids rheology, while magnetic effects on the flow are given from the Lorentz forces. The velocity profiles and flow rate are obtained in the limit of small Hartmann numbers by solving analytically a closed system of ordinary differential equations, together to the corresponding boundary conditions at the solid-liquid interfaces in the channel walls and at the liquid-liquid interfaces between the fluid layers. The results show that the flow field is controlled by the dimensionless parameters that arise from the mathematical modeling being a parameter that indicates the competition between pressure to the magnetic forces, magnetic parameters related to Hartmann numbers, viscosities ratios between the fluids, flow behavior indexes and the dimensionless position of the liquid-liquid interfaces.
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9

Ashrafi, N., A. Hazbavi, and F. Forghani. "Chaos in Non-Newtonian Rotational Flow With Axial Flow." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85608.

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The influence of axial flow on the vortex formation of pseudoplastic rotating flow between cylinders is explored. The fluid is assumed to follow the Carreau-Bird model and mixed boundary conditions are imposed. The four-dimensional low-order dynamical system, resulted from Galerkin projection of the conservation of mass and momentum equations, includes additional nonlinear terms in the velocity components originated from the shear-dependent viscosity. In absence of axial flow the base flow loses its radial flow stability to the vortex structure at a lower critical Taylor number, as the pseudoplasticity increases. The emergence of the vortices corresponds to the onset of a supercritical bifurcation which is also seen in the flow of a linear fluid. However, unlike the Newtonian case, pseudoplastic Taylor vortices lose their stability as the Taylor number reaches a second critical number corresponding to the onset of a Hopf bifurcation. Existence of an axial flow, manifested by a pressure gradient appears to further advance each critical point on the bifurcation diagram. In addition to the simulation of spiral flow, the proposed formulation allows the axial flow to be independent of the main rotating flow. Complete transient flow field together with viscosity maps are also presented.
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10

Hazbavi, A., N. Ashrafi, and M. Najafi. "Viscoelastic Rotating Flow With Viscous Dissipation." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36880.

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The rotational flow of pseudoplastic fluids between concentric cylinders is examined while dissipation due to viscous effects is taken into account. The viscosity of fluid is dependent on shear rate only. The shear rate dependence of viscosity is modeled according to the Carreau equation. Hydrodynamically, stick boundary conditions are applied and thermally, both constant temperature and constant heat flux on the exterior of cylinders are considered. The governing motion and energy balance equations are coupled adding complexity to the already highly correlated set of differential equations. Introduction of Brinkman number has maintained a nonlinear base flow between the cylinders. As well, the condition of constant heat flux has moved the point of maximum temperature towards the inner cylinder. In the presence of viscous heating, the effect of parameters such as Deborah and Brinkman numbers, material time and pseudoplasticity constant is presented. The flow parameters along with viscosity maps are given for different scenarios of the flow.
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