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Academic literature on the topic 'Viscous medium'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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Journal articles on the topic "Viscous medium"

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Liu, Jian Guang, Zhong Jin Wang, Qing Yuan Meng, and Yu Long Zheng. "Effect of Loading Location of Viscous Medium on Sheet Deformation in Viscous Pressure Bulge (VPB) Test." Advanced Materials Research 154-155 (October 2010): 775–80. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.775.

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Viscous pressure forming (VPF) uses a highly viscous but flowable material as pressure-carrying medium (PCM). Due to the relative low flowability of viscous medium compared with fluid, nonuniform pressure distribution in viscous medium can be used to control and regulate the deformation sequence of the workpiece through controlling the loading mode of viscous medium. In the present study, viscous pressure bulge (VPB) tests with three kinds of loading location of viscous medium (central zone, corner zone and the whole deformation zone) are conducted and the influences of loading location of viscous medium on sheet deformation behavior are investigated via numerical simulations and experiments. It is found that changing the loading location of viscous medium can greatly affect the deformation behavior of sheet metal. When the viscous medium is injected from the die corner zone, a local high pressure formed at the corner zone of sheet metal and a higher limiting dome height and strains are obtained.

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Siddiqui, A. M., Tahira Haroon, Mohammad Kahshan, and Muhammad R. Mohyuddin. "HODOGRAPHIC VISCOUS FLOWS IN POROUS MEDIUM." Journal of Porous Media 14, no. 8 (2011): 735–42. http://dx.doi.org/10.1615/jpormedia.v14.i8.70.

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Gao, Tie Jun, Zhan Jun Liu, Yao Wang, and Zhong Jin Wang. "Research on Forming Process and Deformation Rule for the Necking of Viscous Medium under Outer Pressures." Advanced Materials Research 482-484 (February 2012): 2126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.2126.

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In this paper, a novel forming method of viscous medium outer pressure necking is presented. Influences of buckling and wrinkling as well as viscous medium properties in necking process on the forming process is analyzed by finite element method. As a result, rules of deformation of the viscous medium and variation of the tube blank shape in the necking process are obtained, and influences of the viscous medium properties on buckling necking amount and appearance variation of wrinkles are concluded. The research results show that viscous medium can alleviate the influence of buckling and wrinkling on the forming process of necking under certain conditions, and increase the necking deformability of tubular blanks. Meanwhile, choosing viscous medium with high rate-sensitivity is helpful to improve the necking limit.

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Nganguia, Herve, and On Shun Pak. "Squirming motion in a Brinkman medium." Journal of Fluid Mechanics 855 (September 19, 2018): 554–73. http://dx.doi.org/10.1017/jfm.2018.685.

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Micro-organisms encounter heterogeneous viscous environments consisting of networks of obstacles embedded in a viscous fluid medium. In this paper we analyse the characteristics of swimming in a porous medium modelled by the Brinkman equation via a spherical squirmer model. The idealized geometry allows an analytical and exact solution of the flow surrounding a squirmer. The propulsion speed obtained agrees with previous results using the Lorentz reciprocal theorem. Our analysis extends these results to calculate the power dissipation and hence the swimming efficiency of the squirmer in a Brinkman medium. The analytical solution enables a systematic analysis of the structure of the flow surrounding the squirmer, which can be represented in terms of singularities in Brinkman flows. We also discuss the spatial decay of flows due to squirming motion in a Brinkman medium in comparison with the decay in a purely viscous fluid. The results lay the foundation for subsequent studies on hydrodynamic interactions, nutrient transport and uptake by micro-organisms in heterogeneous viscous environments.

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Mukherjee, Swarnajay, and Kausik Sarkar. "Viscoelastic drop falling through a viscous medium." Physics of Fluids 23, no. 1 (January 2011): 013101. http://dx.doi.org/10.1063/1.3533261.

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Chapman, Vivien. "Amylase in a viscous medium‐textile applications." Conservator 10, no. 1 (January 1986): 7–11. http://dx.doi.org/10.1080/01410096.1986.9995011.

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Kamenetsky, Felix M., and George M. Trigubovich. "Transient electromagnetic field in magneto-viscous medium." Journal of Applied Geophysics 75, no. 2 (October 2011): 373–78. http://dx.doi.org/10.1016/j.jappgeo.2011.07.016.

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Wu, T. T., and T. Y. Wu. "Surface Waves in Coated Anisotropic Medium Loaded With Viscous Liquid." Journal of Applied Mechanics 67, no. 2 (December 7, 1999): 262–66. http://dx.doi.org/10.1115/1.1304840.

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The development of micro-acoustic wave sensor in biosensing created the need for further investigations of the surface wave propagation in a viscous liquid loaded layered medium. In this paper, we employed the sextic formalism of surface waves to study the viscous effect on the dispersion and attenuation characteristics of surface waves in a viscous liquid loaded layered medium. The dispersion relation for the viscous liquid loaded single-layered anisotropic half-space is given. Numerical examples of the Rayleigh wave and Love wave dispersion for the cases of a Cu/Fe layered half-space (isotropic) and of a SiO2/Si layered half-space (anisotropic) loaded with viscous liquid are calculated and discussed. [S0021-8936(00)01902-4]

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Gao, Tie Jun, Yao Wang, Jian Guang Liu, and Zhong Jin Wang. "Research on Formability of Aluminum Alloy 2024 Sheet by Viscous Pressure Forming." Advanced Materials Research 634-638 (January 2013): 2872–76. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2872.

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Viscous pressure forming(VPF) using a semi-solid, flowable, highly viscous and certain rate sensitive macromolecule polymer as the forming flexible-die is a good forming method for high strength, low plasticity, complex sheet metal parts. In this paper, the bulging process of aluminum alloy 2024 sheet is carried out by combining methods of experiments with numerical simulation. Influences of viscous medium properties on the geometry of bulging specimens, thickness distribution and the pressure field of viscous medium are analyzed, and the limit bulging heights of aluminum alloy 2024 sheets are obtained. The research results show that choosing viscous medium with high rate sensitivity in the forming process can increase the non-uniformity of viscous pressure field, improve the viscous pressure bulging property of aluminum alloy 2024 sheet, and ameliorate the distribution uniformity of wall thickness of bulging specimens.

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Nield, D. A. "The Modeling of Viscous Dissipation in a Saturated Porous Medium." Journal of Heat Transfer 129, no. 10 (February 4, 2007): 1459–63. http://dx.doi.org/10.1115/1.2755069.

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A critical review is made of recent studies of the modeling of viscous dissipation in a saturated porous medium, with applications to either forced convection or natural convection. Alternative forms of the viscous dissipation function are discussed. Limitations to the concept of fully developed convection are noted. Special attention is focused on the roles of viscous dissipation and work done by pressure forces (flow work) in natural convection in a two-dimensional box with either lateral or bottom heating.

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Dissertations / Theses on the topic "Viscous medium"

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Naami, Abdulaziz Elmabruk. "A study of numerical and experimental modeling of viscous fingering in a two-dimensional consolidated porous medium." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ54735.pdf.

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Guichardon, Pierrette. "Caractérisation chimique du micromélange par la réaction iodure-iodate : application aux milieux visqueux et aux suspensions liquide-solide." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_GUICHARDON_P.pdf.

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Le micromélange ou mélange à l'échelle moléculaire a une influence déterminante sur la qualité des produits, la sélectivité, le rendement de réactions d'importance industrielle comme certaines synthèses organiques, les réactions de polymérisation et de précipitation. Cette étude a pour but le développement d'une méthode chimique de caractérisation du micromélange: la réaction iodure-iodate. Nous avons tout d'abord considéré le protocole expérimental puis avons étudié dans l'eau, l'influence sur la qualité du micromélange des concentrations initiales des réactifs, de la vitesse d'agitation, de la position de l'injection, dans des réacteurs de 1, 20 et 100 litres. L’interprétation des résultats par le modèle d'incorporation a montré que les temps de micromélange obtenus sont, pour cette large gamme de conditions expérimentales, en très bon accord avec ceux prédits par la théorie de la turbulence. Enfin, nous avons étendu l'utilisation de ce test aux milieux visqueux et aux suspensions liquide-solide. Nous avons, en particulier, mis en évidence le ralentissement du micromélange au fur et à mesure que la viscosité augmente, ralentissement que nous pouvons décrire par un modèle IEM/incorporation. De plus, nous avons montré pour nos conditions d'étude (fraction massique de solide inferieure à 6% et diamètre de particule compris entre 20 et 1300 micromètres) que la présence de billes de verre ne modifie pas de manière significative la qualité du micromélange

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Pinot, Jordanna. "Caractérisation du micromélange par la réaction iodure-iodate en milieu visqueux." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0140/document.

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Le micromélange, ou mélange à l'échelle moléculaire, a une influence déterminante sur la qualité des produits, la sélectivité, et le rendement de réactions d'importance industrielle comme les réactions de polymérisation. A l'heure actuelle, les systèmes chimiques existants sont bien adaptés à l'étude du micromélange de produits faiblement visqueux, mais il n'existe pas de méthode simple et opérationnelle pour les fluides plus visqueux. Inscrite dans le cadre du projet ANR PROCIP, l'étude a consisté à mettre en place une nouvelle méthode de quantification de l'efficacité du micromélange en milieu visqueux dans des réacteurs agités. La méthode utilisée s'inspire d'un système chimique basé sur deux réactions concurrentes, le système de réaction test iodure-iodate, dont la sélectivité d'un des produits est une mesure de l'efficacité du micromélange. L'approche propose un nouveau protocole basé sur le choix d'un tampon phosphate et l'utilisation de l'HydroxyEthylCellulose (HEC, 720 000 g/mol) comme agent viscosifiant inerte, qui possède un fort pouvoir viscosifiant permettant d'augmenter significativement la viscosité sans en ajouter plus de 1 % en masse dans le milieu. Des essais de caractérisation du micromélange en réacteur agité ont mis en évidence le ralentissement du micromélange au fur et à mesure que la viscosité augmente pour des pourcentages en HEC inférieurs à 0,5 %. Par contre, au-delà de 0,5 %, une « amélioration » du micromélange a été observée dans une large gamme de conditions expérimentales (différentes concentrations de réactifs, positions de l'injection, vitesses d'agitation et mobiles d'agitation). Plusieurs causes potentielles ont été formulées en vue d'expliquer ce phénomène et les cinétiques des réactions mises en jeu ont également été étudiées en présence de l'agent viscosifiant HEC et s'avèrent être inchangées. Enfin, une étude des interactions possibles entre les espèces iodées et l'HEC a été réalisée pour étudier l'existence d'une réaction parasite qui pourrait expliquer les résultats obtenus
Micromixing, or mixing at the molecular scale, has a decisive influence on product quality, selectivity and yield of industrially important reactions such as polymerization reactions. Currently, the existing chemical systems are well suited to the study of micromixing of low viscosity products, but no reliable characterization method exists for highly viscous media. As a part of the ANR project PROCIP, the study consisted in developing a new method to quantify the efficiency of micromixing in viscous media in stirred reactors. The method used is inspired by a chemical system based on two competitive reactions, the iodide-iodate test reaction system whose selectivity of a product is a measure of the micromixing efficiency. The approach proposes a new protocol based on a phosphate buffer and the use of HydroxyEthylCellulose (HEC, 720,000 g / mol) as an inert viscosifying agent, enabling to significantly increase the viscosity without adding more than 1 % by mass in the medium. Characterization of micromixing in a stirred reactor showed the slowing down of micromixing as viscosity increases for percentages of HEC below 0.5 %. By contrast, above 0.5 %, an "improvement" of micromixing has been observed in a wide range of experimental conditions (different concentrations of reactants, injection positions, stirring speeds and impellers). Several possible causes have been made to explain this phenomenon unexpected and the kinetics of the reactions involved were also studied in the presence of the viscosifying agent HEC and appeared to be unchanged. Finally, a study of possible interactions between iodine species and HEC was performed to study the existence of a secondary reaction which could explain the results

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Whiting, Andrew Ivan Melville. "Localized buckling of an elastic strut in a visco-elastic medium." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/37110.

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Certain types of long, axially compressed structures have the potential to buckle locally in one or more regions rather than uniformly along their length. Here, the potential for localized buckle patterns in an elastic layer embedded in a visco-elastic medium is investigated using a strut-on-foundation model. Applications of this model include the growth of geological folds and other time-dependent instability processes. The model consists of an elastic strut of uniform flexural stiffness supported by a Winkler-type foundation made up of discrete Maxwell elements. Mathematically, this model corresponds to a nonlinear partial differential equation which is fourth-order in space and first-order in time. The nature of the buckling process is characterized by an initial period of elastic deformation followed by an evolutionary phase in which both elasticity and viscosity have a role to play. Two different formulations are studied: the first combines linear strut theory with a nonlinear foundation and is valid for small, but finite, deflections; the other incorporates the exact expression for curvature of the strut resulting in geometrical nonlinearities and is capable of modelling large deflections. The evolution of non-periodic buckle patterns in each system is examined under the constraint of controlled end displacement. Two independent methods are used to approximate the solution of the governing equations. Modal solutions, based on the method of weighted residuals, complement accurate numerical solutions obtained with a boundary-value solver. In either case, the results suggest that for the perfect system, localized solutions follow naturally from the inclusion of nonlinear elasticity with softening characteristics. Emphasis throughout is on the qualitative features displayed by the phenomenon of localization rather than specific applications. Nevertheless, the ideas and results are a step towards accounting for the rich variety of deformed shapes exhibited by nature.

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Maalouf, Abdellah. "Etude numérique et expérimentale de l'écoulement plan autour et au travers d'un cylindre, à faibles nombres de Reynolds : modélisaton d'un milieu poreux par des treillis de cylindres." Poitiers, 1987. http://www.theses.fr/1987POIT2032.

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Etude experimentale des proprietes de quelques corps poreux consolides ou non et de l'ecoulement autour et au travers de trois coques cylindriques poreuses. Etude theorique et numerique de l'ecoulement confine pour differentes conditions de raccordement. Etude par le calcul et l'experience de l'ecoulement lent au travers de milieux poreux representes par differentes structures de treillis de cylindres et regi par les lois de stokes et de brinkman. Mise en evidence de zones de recirculation dans ces milieux

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Marusic-Paloka, Eduard. "Modélisation par homogénéisation des écoulements en milieux poreux fissurés." Saint-Etienne, 1995. http://www.theses.fr/1995STET4008.

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Dans cette thèse nous présentons plusieurs résultats qui concernent l'homogénéisation appliquée à la modélisation des milieux poreux. Elle est composée de quatre chapitres indépendants. Dans les premier et deuxième chapitres nous étudions le comportement effectif des solutions de l'équation de Laplace et du système de Stokes dans un milieu poreux, contenant une fissure mince. Suivant la relation entre la taille caractéristique des pores et l'épaisseur de la fissure nous trouvons trois modèles différents. Le troisième chapitre présente un résultat qui concerne les estimations d'erreur pour les correcteurs dans l'homogénéisation du système de Stokes et de Navier-Stokes, pour un milieu poreux. Dans le dernier chapitre nous étudions les effets inertiels pour un écoulement visqueux, rapide dans une couche ondulée. Nous trouvons une loi globale non linéaire

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NORONHA, Elisa Vila Nova de. "Avalia??o de medidas reol?gicas em viscos?metro online." Universidade Federal Rural do Rio de Janeiro, 2016. https://tede.ufrrj.br/jspui/handle/jspui/2145.

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Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-10-31T17:20:21Z No. of bitstreams: 1 2016 - Elisa Vila Nova de Noronha.pdf: 4419781 bytes, checksum: 0804df588af66f56621082802458f769 (MD5)
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For the drilling process to succeed, it is necessary the use of a drilling fluid. The measurement of rheological properties from these fluids becomes important in order to allow good hydraulic gusher maintenance and management. If these measures are taken in an on- line order that will mean agility in decision-making about the maintenance of the properties of the fluid and it will result in savings of thousands of dollars during the drilling of a well. It is in this context that this current report, developed in the UFRRJ laboratory of fluid flow, aims to evaluate the performance of a modified and calibrated process viscometer, making it a unique equipment for conducting real-time measures of apparent viscosity and thixotropy curve. The process viscometer chosen has the geometry of coaxial cylinders being, thus similar to the current workbench equipment used in drilling rigs. The modified viscometer performance was confronted with the rheometer benchtop Haake Rheostress 1. Different compositions of fluids, containing assorted concentrations of viscosifier polymers and suspension solid have been tested. The results indicated that there was an agreement on the results towards a considered error permissible for a viscometer process. The online viscometer brings a pioneering real-time measuring capacity and plotting of rheological behavior curves towards the current technology used in drilling operation.
Para que o processo de perfura??o seja bem-sucedido, ? necess?rio o uso de um fluido de perfura??o. A medi??o das propriedades reol?gicas destes fluidos torna-se importante para permitir uma boa manuten??o e gest?o hidr?ulica do po?o. Se estas medidas forem realizadas de forma online isso significar? agilidade na tomada de decis?o sobre a manuten??o das propriedades do fluido e acarretar? na economia de milhares de d?lares durante a perfura??o de um po?o. ? neste contexto que o presente trabalho, desenvolvido no Laborat?rio de Escoamento de Fluidos da UFRRJ, tem como objetivo avaliar o desempenho de um viscos?metro de processo modificado e calibrado, tornando-o em um equipamento exclusivo, para realizar medidas em tempo real de curva de viscosidade aparente e tixotropia. O viscos?metro de processo escolhido tem a mesma geometria de cilindros coaxiais sendo desta forma semelhante ao atual equipamento de bancada utilizado nas sondas de perfura??o. O desempenho do viscos?metro modificado foi confrontado com o re?metro de bancada Haake Rheostress 1. Foram testadas diferentes composi??es de fluidos contendo concentra??es variadas de pol?meros viscosificantes e s?lidos em suspens?o. Os resultados obtidos indicaram que houve concord?ncia nos resultados diante de um erro considerado admiss?vel para um viscos?metro de processo. Acredita-se que o viscos?metro online avaliado traz uma capacidade pioneira de medi??o em tempo real e plotagem de curvas de comportamento reol?gico diante da atual tecnologia utilizada na ?rea petroqu?mica.

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Lázaro, Navarro Mario. "The Eigenvalue Problem in Linear Viscoelastic Structures: New Numerical Approaches and the Equivalent Viscous Model." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/30062.

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El análisis y el control de las vibraciones cobra especial importancia en muchas ramas de la ingeniería, en especial la ingeniería mecánica, civil, aeronáutica y automovilística. Tal es así que prácticamente se identi¿ca como un área independiente dentro del análisis dinámico de estructuras. Desde los comienzos de esta teoría, las fuerzas disipativas o de amortiguamiento han sido uno de los fenómenos más difíciles de modelizar. El modelo viscoso, por su sencillez y versatilidad ha sido y sigue siendo el gran paradigma de los modelos de amortiguamiento. Sin embargo, como consecuencia de la aparición de materiales con memoria se introdujo el fenómeno de la viscoelasticidad; Esta, si bien está también 'íntimamente ligada ' a la velocidad de la respuesta, necesito de la introducción de las denominadas funciones hereditarias, que permiten poner a las fuerzas disipativas como función no solo de la velocidad instantánea sino de la historia de velocidades desde el comienzo del movimiento, de ahí el termino memoria. De forma natural, el avance teórico introducido en el modelo supone también una complicación computacional, pues donde antes teníamos un sistema lineal de ecuaciones diferenciales ahora tenemos un sistema de ecuaciones integro-diferenciales. El análisis de las vibraciones libres de los sistemas con amortiguamiento viscoelástico conduce a un problema nolineal de autovalores donde la característica principal es una matriz de amortiguamiento que depende de la frecuencia de excitación. El estudio de la solución de autovalores y autovectores de este problema es importante si se desean conocer los modos de vibración de la estructura o si se pretende obtener la respuesta en el dominio de la frecuencia del sistema. El objetivo fundamental de esta Tesis Doctoral es doble: Por un lado, profundizar en el conocimiento del problema de autovalores de sistemas viscoelásticos proponiendo para ello nuevos métodos numéricos de resolución. Por otro, desarrollar un nuevo modelo viscoso que, bajo ciertas condiciones, reproduzca la respuesta del modelo viscoelástico con su¿ciente aproximación. La Tesis se divide en ocho capítulos, de ellos el cuerpo principal se encuentra en los seis centrales (Capítulos 2 a 7. Todos ellos son artículos de investigación que, o bien han sido publicados, o bien están en proceso de revisión en revistas contenidas en el Journal Citation Reports (JCR). Por esta razón, todos los capítulos conservan la estructura intrínseca de un artículo, incluidas una introducción y una bibliografía en cada uno. Los cuatro primeros capítulos (Capítulos 2 a 5) se centran en el estudio del problema no lineal de autovalores. Se proponen dos metodologías de resolución: la primera es un procedimiento iterativo basado en el esquema del punto-¿jo y desarrollado para sistemas proporcionales o ligeramente no-proporcionales (aquellos en los que los modos se presentan desacoplados o casi desacoplados). La segunda metodología (presentada en dos capítulos diferentes), denominada paramétrica, permite obtener soluciones casi-analíticas de los autovalores, tanto para sistemas de un grado de libertad como para sistemas de múltiples grados de libertad y dentro de 'estos, para sistemas proporcionales y no proporcionales. El estudio del problema de autovalores se completa con un capítulo dedicado a los autovalores reales, también denominados autovalores no viscosos. En 'él se demuestra una nueva caracterización maten ática que deben cumplir dichos autovalores y que permite proponer un nuevo concepto: el conjunto no-viscoso. Los dos 'últimos capítulos (Capítulos 6 y 7) analizan el Modelo Viscoso Equivalente como propuesta para la modelización de la respuesta de sistemas viscoelásticos. El análisis se realiza desde el dominio de la frecuencia estudiando la función de transferencia. En una primera etapa (pen último capítulo), de naturaleza más maten ática, se demuestra que la función de transferencia exacta de un modelo viscoelástico se puede expresar como suma de una función de transferencia propia de un modelo viscoso más un término denominado residual, directamente dependiente del nivel de amortiguamiento inducido y del acoplamiento modal (noproporcionalidad de la matriz de amortiguamiento). En una segunda etapa ('ultimo capítulo), se desarrolla una aplicación para estructuras reales formadas por entramados planos de elementos 1D amortiguados con capas de material visco elástico. Este tipo de estructuras ha permitido usar una variante mejorada del método paramétrico para la obtención de los autovalores, de forma que en este 'ultimo capítulo ha servido como nexo de unión de las metodologías más importantes desarrolladas en la Tesis.
Lázaro Navarro, M. (2013). The Eigenvalue Problem in Linear Viscoelastic Structures: New Numerical Approaches and the Equivalent Viscous Model [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/30062
TESIS

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Vu, Mai Ba. "Contribution à la caractérisation des milieux (visco-)élastiques anisotropes et hétérogènes : application au tissu osseux." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00674157.

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Ce travail est une contribution à la caractérisation mécanique de l'os cortical. Dansce cadre, les méthodes ultrasonores sont des outils puissants pour aider à cette caractérisation.Ainsi, les phénomènes de propagation d'ondes mis en jeu lors des mesurespar les techniques ultrasonores de transmission axiale à la fréquence centrale de 1 MHzsont modélisés. Des méthodes numériques basées sur la méthode des éléments finis sontmises en oeuvre pour résoudre les systèmes d'équations aux dérivées partielles associéesaux conditions aux limites et initiales pour des tissus dont le comportement est supposé(visco-)élastique, anisotrope et/ou hétérogène. L'analyse des résultats de simulation permetde discuter l'influence des divers paramètres, non seulement en termes de propriétésmatérielles mais aussi géométriques, sur la nature des ondes qui se propagent dans lestissus. Nous avons ainsi pu analyse l'impact de ces paramètres sur la vitesse du premiersignal laquelle est considérée comme un indice pertinent pour mesurer la qualité du tissuosseux. Toujours dans le but de caractériser le tissu osseux, et en particulier pour obtenirdes valeurs de propriétés matérielles aussi proches que possible de la réalité, nous avonsdéveloppé une nouvelle méthode basée sur les développements asymptotiques, du typehomogénéisation périodique, pour prédire les modules d'élasticité effective de l'os corticaldu tissu hétérogène.

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Martínez, Rodrigo María de los Dolores. "Atenuación de vibraciones resonantes en puentes de ferrocarril de alta velocidad mediante amortiguadores fluido-viscosos." Doctoral thesis, Editorial Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/4336.

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En el marco de esta Tesis Doctoral se investiga el problema de vibraciones verticales excesivas que pueden experimentar algunos puentes de ferrocarril de luces medias-cortas debido a la aparición de fenómenos de resonancia. Frente a soluciones tradicionales para mejorar el comportamiento dinámico de estructuras existentes ante nuevos requerimientos de tráfico, como un posible recrecido de la losa o la sustitución del tablero, se plantea la alternativa de aumentar externamente el nivel de amortiguamiento mediante el reacondicionamiento con amortiguadores fluido-viscosos. Se ha propuesto una configuración concreta, que permite la transformación del movimiento vertical de la losa en movimiento relativo entre extremos de los dispositivos, consiguiendo de este modo disipar energía y atenuar en gran medida la respuesta resonante. El sistema ideado podría ser introducido sin afectar a las circulaciones, lo que supone una clara ventaja desde el punto de vista operativo frente a soluciones convencionales que generalmente implican el cierrre temporal de la línea.
Martínez Rodrigo, MDLD. (2009). Atenuación de vibraciones resonantes en puentes de ferrocarril de alta velocidad mediante amortiguadores fluido-viscosos [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/4336
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Books on the topic "Viscous medium"

1

Kyle, Anderson W., Mavriplis Dimitri, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Numerical study to assess sulfur hexafluoride as a medium for testing multielement airfoils. [Washington, DC: National Aeronautics and Space Administration, 1995.

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Zhao, Alex X. Fluid oscillations and enhanced heat transfer in a parallel plate channel bounded by end reservoirs maintained at different temperature. 1990.

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Book chapters on the topic "Viscous medium"

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Kulikovskii, A., and E. Sveshnikova. "Viscous-Elastic Medium Motion." In Nonlinear Waves in Elastic Media, 175–202. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003210474-8.

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Saghir, M. Z., H. H. Vaziri, and M. R. Islam. "Viscous Fingering in a Rotating Porous Medium." In Processing by Centrifugation, 303–16. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-0687-4_38.

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Gary, G., L. Rota, and H. Zhao. "Testing viscous soft materials at medium and high strain rates." In Constitutive Relation in High/Very High Strain Rates, 25–32. Tokyo: Springer Japan, 1996. http://dx.doi.org/10.1007/978-4-431-65947-1_3.

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Fung, Lloyd, and Yongyun Hwang. "Instability of Tilted Shear Flow in a Strongly Stratified and Viscous Medium." In IUTAM Laminar-Turbulent Transition, 379–89. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67902-6_33.

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Yadao, Adik R., and Dayal R. Parhi. "Experimental and Numerical Analysis of Cracked Shaft in Viscous Medium at Finite Region." In Advances in Structural Engineering, 1601–9. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2193-7_122.

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Yadao, Adik, and Abhishek Kumar Kashyap. "Experimental Investigation of Vibration Response of Faulty Rotor Shaft Partially Submerged in Viscous Medium." In Lecture Notes in Mechanical Engineering, 449–55. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2696-1_44.

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Gotlib, Yu Ya, and A. A. Gurtovenko. "The Relaxation Spectra of Polymer Networks with Mobile Effective Viscous Medium Carrying Away by the Network." In Progress and Trends in Rheology V, 328–29. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_155.

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Flilihi, Elyazid, Mohammed Sriti, and Driss Achemlal. "Viscous Dissipation and Heat Source/Sink Effects on Convection Heat Transfer in a Saturated Porous Medium." In Embedded Systems and Artificial Intelligence, 109–19. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0947-6_11.

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Rubin, M. B. "Coupled Nonlinear Thermoelastic Equations for an Orthotropic Beam with Thermal and Viscous Dissipation." In Continuous Media with Microstructure, 103–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11445-8_10.

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Chetverushkin, Boris N., and Eugene V. Shilnikov. "Unsteady Viscous Flow Simulation Based on QGD System." In Mathematical Models of Non-Linear Excitations, Transfer, Dynamics, and Control in Condensed Systems and Other Media, 137–46. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4799-0_11.

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Conference papers on the topic "Viscous medium"

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Klingner, Anke, Dalia Mahdy, Mostafa Hanafi, Barbara Adel, Sarthak Misra, and Islam S. M. Khalil. "Helical Propulsion in a Viscous Heterogeneous Medium." In 2020 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS). IEEE, 2020. http://dx.doi.org/10.1109/marss49294.2020.9307830.

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Sulaiman, A., F. P. Zen, H. Alatas, and L. T. Handoko. "Dynamics of DNA bubble in viscous medium." In INTERNATIONAL CONFERENCE ON PHYSICS AND ITS APPLICATIONS: (ICPAP 2011). AIP, 2012. http://dx.doi.org/10.1063/1.4730745.

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Ashraf, Shabina, and Jyoti Phirani. "Capillary Impregnation of Viscous Fluids in a Multi-Layered Porous Medium." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5168.

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Abstract Capillary impregnation of viscous fluids in porous media is useful in diagnostics, design of lab-on-chip devices and enhanced oil recovery. The impregnation of a wetting fluid in a homogeneous porous medium follows Washburn’s diffusive law. The diffusive dynamics predicts that, with the increase in permeability, the rate of spontaneous imbibition of a wetting fluid also increases. As most of the naturally occurring porous media are composed of hydrodynamically interacting layers having different properties, the impregnation in a heterogeneous porous medium is significantly different from a homogeneous porous medium. A Washburn like model has been developed in the past to predict the imbibition behavior in the layers for a hydrodynamically interacting three layered porous medium filled with a non-viscous resident phase. It was observed that the relative placement of the layers impacts the imbibition phenomena significantly. In this work, we develop a quasi one-dimensional lubrication approximation to predict the imbibition dynamics in a hydrodynamically interacting multi-layered porous medium. The generalized model shows that the arrangement of layers strongly affects the saturation of wetting phase in the porous medium, which is crucial for oil recovery and in microfluidic applications.

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Zavalishchin, D. "Nonstationary Boussinesq viscous medium flow for a solid." In APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES: 10th International Conference for Promoting the Application of Mathematics in Technical and Natural Sciences - AMiTaNS’18. Author(s), 2018. http://dx.doi.org/10.1063/1.5064902.

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Zavalishchin, D. S. "Optimization of solids displacements in a viscous medium." In 2018 14th International Conference "Stability and Oscillations of Nonlinear Control Systems" (Pyatnitskiy's Conference) (STAB). IEEE, 2018. http://dx.doi.org/10.1109/stab.2018.8408413.

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M. Mueller, T., and P. N. Sahay. "Porous Medium Acoustics in the Presence of Viscous Boundary Layers." In 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609.201400854.

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Kamangar, Sarfaraz, Maughal Ahmed Ali Baig, Azeem, N. Ameer Ahamad, and Irfan Anjum Badruddin. "Finite element solution strategy for viscous dissipation in porous medium." In INTERNATIONAL CONFERENCE ON “MULTIDIMENSIONAL ROLE OF BASIC SCIENCE IN ADVANCED TECHNOLOGY” ICMBAT 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5100484.

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Rukavishnikov, V. A., and O. P. Tkachenko. "Numerical modeling of the fluid-filled pipelines in viscous medium." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2015 (ICNAAM 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4951792.

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Zavalishchin, Dmitry. "Mathematical model of the cylinder rotations in a viscous medium." In APPLICATIONS OF MATHEMATICS IN ENGINEERING AND ECONOMICS (AMEE'14). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4902451.

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Shaikh, Adiba, Manu Kurian, Santosh Kumar Das, Vinod Chandra, Sadhana Dash, and Basanta Kumar Nandi. "Charm quark transport within viscous QCD medium : colliding and radiating." In 10th International Workshop on Charm Physics. Trieste, Italy: Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.385.0060.

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Reports on the topic "Viscous medium"

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Moridis, G., P. Yen, P. Persoff, S. Finsterle, P. Williams, L. Myer, and K. Pruess. A design study for a medium-scale field demonstration of the viscous barrier technology. Office of Scientific and Technical Information (OSTI), September 1996. http://dx.doi.org/10.2172/432830.

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Tang, Hong, Xiankai Sun, and Kingyan Fong. Control of the Dissipation Dynamics of Nanomechanical Resonator in Viscous Media. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada604766.

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Stoelzel, D. M. An experimental study to determine the relative influence of fluid-fluid interactions and media heterogeneities on the growth of immiscible viscous fingers. Office of Scientific and Technical Information (OSTI), January 1988. http://dx.doi.org/10.2172/6212732.

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