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Relevant bibliographies by topics / Elongational flow

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Academic literature on the topic 'Elongational flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Elongational flow"

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Kugler, Susanne Katrin, Argha Protim Dey, Sandra Saad, Camilo Cruz, Armin Kech, and Tim Osswald. "A Flow-Dependent Fiber Orientation Model." Journal of Composites Science 4, no. 3 (July 22, 2020): 96. http://dx.doi.org/10.3390/jcs4030096.

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The mechanical performance of fiber reinforced polymers is dependent on the process-induced fiber orientation. In this work, we focus on the prediction of the fiber orientation in an injection-molded short fiber reinforced thermoplastic part using an original multi-scale modeling approach. A particle-based model developed for shear flows is extended to elongational flows. This mechanistic model for elongational flows is validated using an experiment, which was conducted for a long fiber reinforced polymer. The influence of several fiber descriptors and fluid viscosity on fiber orientation under elongational flow is studied at the micro-scale. Based on this sensitivity analysis, a common parameter set for a continuum-based fiber orientation macroscopic model is defined under elongational flow. We then develop a novel flow-dependent macroscopic fiber orientation, which takes into consideration the effect of both elongational and shear flow on the fiber orientation evolution during the filling of a mold cavity. The model is objective and shows better performance in comparison to state-of-the-art fiber orientation models when compared to μCT-based fiber orientation measurements for several industrial parts. The model is implemented using the simulation software Autodesk Moldflow Insight Scandium® 2019.

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KOYAMA, Kiyohito, and Osamu ISHIZUKA. "Elongational Flow of Polymer Melt." Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan) 13, no. 3 (1985): 93–100. http://dx.doi.org/10.1678/rheology1973.13.3_93.

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Evans, J. R. G., and J. Greener. "Elongational flow processing of ceramics." Journal of Materials Processing Technology 96, no. 1-3 (November 1999): 143–50. http://dx.doi.org/10.1016/s0924-0136(99)00325-8.

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Kim, Hwan Chul, Ajit Pendse, and John R. Collier. "Polymer melt lubricated elongational flow." Journal of Rheology 38, no. 4 (July 1994): 831–45. http://dx.doi.org/10.1122/1.550595.

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Rabin, Y. "Polymer conformation in elongational flow." Journal of Chemical Physics 88, no. 6 (March 15, 1988): 4014–17. http://dx.doi.org/10.1063/1.453853.

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Kaye, A. "Convected coordinates and elongational flow." Journal of Non-Newtonian Fluid Mechanics 40, no. 1 (July 1991): 55–77. http://dx.doi.org/10.1016/0377-0257(91)87026-t.

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Varchanis, Stylianos, Simon J. Haward, Cameron C. Hopkins, Alexandros Syrakos, Amy Q. Shen, Yannis Dimakopoulos, and John Tsamopoulos. "Transition between solid and liquid state of yield-stress fluids under purely extensional deformations." Proceedings of the National Academy of Sciences 117, no. 23 (May 20, 2020): 12611–17. http://dx.doi.org/10.1073/pnas.1922242117.

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We report experimental microfluidic measurements and theoretical modeling of elastoviscoplastic materials under steady, planar elongation. Employing a theory that allows the solid state to deform, we predict the yielding and flow dynamics of such complex materials in pure extensional flows. We find a significant deviation of the ratio of the elongational to the shear yield stress from the standard value predicted by ideal viscoplastic theory, which is attributed to the normal stresses that develop in the solid state prior to yielding. Our results show that the yield strain of the material governs the transition dynamics from the solid state to the liquid state. Finally, given the difficulties of quantifying the stress field in such materials under elongational flow conditions, we identify a simple scaling law that enables the determination of the elongational yield stress from experimentally measured velocity fields.

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Rabin, Yitzhak, Frank S. Henyey, and Dennis B. Creamer. "Flow modification by polymers in strong elongational flows." Journal of Chemical Physics 85, no. 8 (October 15, 1986): 4696–701. http://dx.doi.org/10.1063/1.451744.

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Todd, B. D., and Peter J. Daivis. "Elongational viscosities from nonequilibrium molecular dynamics simulations of oscillatory elongational flow." Journal of Chemical Physics 107, no. 5 (August 1997): 1617–24. http://dx.doi.org/10.1063/1.474512.

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Münstedt, Helmut. "Recoverable Extensional Flow of Polymer Melts and Its Relevance for Processing." Polymers 12, no. 7 (July 8, 2020): 1512. http://dx.doi.org/10.3390/polym12071512.

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While the uniaxial elongational viscosity is widely investigated, and its relevance for processing is described in the literature, much less has been published on the recoverable extensional flow of polymer melts. This paper presents a short overview of the dependencies of the recoverable elongation on the molecular structure of a polymer, and on some experimental parameters. Its main focus lies on the discussion of processing operations and applications that are largely affected by the elastic components of elongational flow. The recoverable portions of stretched films are considered, and the exploitation of the shrinkage of films, due to the recovery of frozen recoverable deformations, and its role for applications are addressed. The analysis of measurements of velocity fields in the entry region of a slit die and results on the determination of the recoverable elongation from uniaxial experiments, according to the literature, lead to the conclusion of dominant elastic extensions. Considering these facts, the assumptions for Cogswell’s widely used method of determining elongational viscosities under processing conditions from entrance flow are not realistic. As examples of a direct application of extrudate swell from short dies for processing, pelletizing and fused deposition modelling within additive manufacturing are addressed. The special features of extrudate swell from short dies, and uniaxial recoverable elongation for a polymer filled with rigid particles in comparison to an immiscible polymer blend, are presented and discussed.

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Dissertations / Theses on the topic "Elongational flow"

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Greener, James. "Elongational flow in ceramics processing." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294511.

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Smitter, Luis Manuel. "Study of the interactions between poly(ethylene oxide) and anionic surfactants in elongational flow." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279813.

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The rheology of polymer solutions is important in a wide variety of applications. In particular, solutions of high-molecular-weight, flexible polymers exhibit an increase in their apparent extensional viscosity with strain rate under extensional flow conditions. This extension thickening is due to formation of transient entanglements of polymer molecules. Certain commercial fluids contain both polymers and surfactants that might interact at the molecular level. These interactions affect the conformation of the polymer chain and, therefore, the rheological behavior of the solution. For instance, addition of anionic surfactants to solutions of nonionic polymers is known to induce increases in the shear viscosity of aqueous solution. This work investigates the behavior of aqueous solutions of a high-molecular-weight poly(ethylene oxide) (PEO), a nonionic, flexible polymer, and the anionic surfactants sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS) and a commercial alpha-olefin sulfonate (AOS) in extensional flows. The extensional rheology of polymer/surfactant solutions is studied in an opposed-jets device, which generates a flow field close to uniaxial extension. For PEO/SDS mixtures, the results show that formation of micellar aggregates of SDS along the PEO chains results in an increase in the strength of extension thickening of PEO solutions by promoting intermolecular interactions between polymer chains. The minimum PEO concentration required to form intermolecular entanglements is substantially reduced in the presence of micellar aggregates. In solutions containing NaCl, intramolecular interactions are observed at low PEO concentrations. These reduce the strength of extension thickening. Addition of a co-solvent is investigated. The presence of alcohols in the aqueous solutions affects their rheology by changing the solvent nature for both PEO and SDS. In particular, n-octanol promotes aggregation of SDS along the PEO chains, enhancing intermolecular network formation in extensional flow. Results with mixtures of PEO with sulfonated surfactants (SDBS and AOS) show that both intermolecular and intramolecular interactions are promoted by these surfactants, depending on PEO concentration and molecular weight. The effect of ageing on these polymer/surfactant systems was studied. In extensional flows, extension thickening is suppressed in solutions of PEO with SDBS or AOS over a few-day period, whereas PEO and PEO/SDS solutions show no change.

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Frascoli, Federico. "Chaotic and rheological properties of liquids under planar shear and elongational flows." Swinburne Research Bank, 2007. http://hdl.handle.net/1959.3/22416.

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Thesis (PhD) - Swinburne University of Technology, Centre for Molecular Simulation - 2007.
Dissertation submitted in fulfilment of requirements for the degree Doctor of Philosophy, Centre for Molecular Simulation, Faculty of Information and Communication Technologies, Swinburne University of Technology, 2007. Typescript. Includes bibliographical references (p. 151-161).

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Recktenwald, Steffen Michael [Verfasser], and N. [Akademischer Betreuer] Willenbacher. "Flow Instabilities of Dilute Surfactant Solutions in Elongational Deformations / Steffen Michael Recktenwald ; Betreuer: N. Willenbacher." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1190178834/34.

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Hadinata, Chitiur, and chitiurh@yahoo com au. "Flow-induced crystallization of polybutene-1 and effect of molecular parameters." RMIT University. Civil, Environmental and Chemical Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.163803.

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There are two main goals of this thesis: to investigate the flow-induced crystallization behaviour of Polybutene-1 (PB-1 samples, and to study the effects of molecular parameters on the crystallization behaviour While flow-induced crystallization is not a new area in polymer research, well-defined experimental methods that allow access to high flow rate range comparable to that encountered in real processing are still lacking. Two types of flow are considered: shear and uniaxial elongational. Regarding the second aim, several molecular parameters considered are: molecular weight, molecular weight distribution, isotacticity, presence of nucleating agents, and copolymer content. For this purpose an array of PB-1 samples were used. It is found that each of these parameters can have significant effect on the crystallization behaviour. Mainly rheological methods were utilized to conduct the flow-induced crystallization experiments. Crystallization onset time is define d from the change in viscosity or other related parameters. The experiments begin with low shear rate range, to ensure that the results are comparable with literature data. In this range we encounter the quasi-quiescent onset time at very small. shear rates, which draws an interesting comparison with another physical parameter, the gel time. Beyond a critical flow rate a decrease in the onset time is seen, and a plateau-and-slope trend is evident for a curve of onset time vs. shear rate. Using a combination of three experimental methods, shear rates ranging from Q0001 - 500 s-1 are successfully achieved, and a good agreement between these methods is observed. Furthermore, a normalization procedure is introduced, which yields temperature-invariant curves for the mentioned range of shear rate. For the uniaxial elongation flow, the Elongational Viscosity Fixture (EVF) is employed, with the strain rate ranging from 0.0001 - 10 s'. A greater reduction in onset time as compared to shear (at the same shear/strain r ate) is observed, and the difference in the onset times for shear and elongation already reaches more than one decade for a flow rate of 10 5. This quantitative comparison is particularly important; since not so many data on elongation-induced crystallization are available in the literature. Finally, the thesis compares several flow induced crystallization models that can be useful as prediction tools and selects one of these models to be compared with the experimental data. A qualitative agreement is found, however, for better quantitative prediction the model still needs to be.

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Georgieva, Kristina [Verfasser], and N. [Akademischer Betreuer] Willenbacher. "Clogging of Microchannels by Nano-particles due to Hetero-coagulation in Elongational Flow / Kristina Georgieva. Betreuer: N. Willenbacher." Karlsruhe : KIT-Bibliothek, 2013. http://d-nb.info/1033837318/34.

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Yu, Wei. "Development of an elongational-flow microprocess for the production of size-controlled nanoemulsions : application to the preparation of composite and hybrid polymeric microparticles." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE027/document.

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L’objectif de ce travail fut de développer et d’étudier les performances d’un microprocédé basse pression à écoulement élongationnel pour la production de nanoémulsions polymérisables de tailles contrôlées et de distributions de taille étroites. Le diamètre des nanogouttelettes a pu être précisément ajusté dans la gamme 50-300 nm en modifiant simplement les paramètres de procédé : le débit réciproque au travers du micromélangeur, le nombre de cycles et la dimension caractéristique du microcanal. Les nanoémulsions produites furent, dans une seconde étape, polymérisées par voie thermique ou par irradiation UV afin de générer des suspensions colloïdales de nanoparticules de polymère de tailles également contrôlées (87-360 nm). Un monomère, un agent de réticulation ainsi qu’un amorceur thermique ou photochimique appropriés furent par la suite ajoutés au milieu continu de ces nanosuspensions. Les solutions résultantes servirent comme phases dispersées dans des générateurs microfluidiques de gouttelettes à capillaires. Les microgouttelettes de taille contrôlée ainsi produites furent polymérisées en ligne par irradiation UV pour donner lieu à des microsphères ou à des microparticules coeur-écorce composites de polymère toutes deux dopées avec des nanoparticules de polymère. Des microparticles composites et hydrides comportant des nanoparticules d’or dans le coeur et d’argent dans l’écorce furent également obtenues grâce à la réduction photochimique in situ des sels précurseurs lors de la photopolymérisation des microgouttelettes. Ce travail a démontré l’efficacité d’un nouveau dispositif microfluidique basse énergie pour la production de nanoémulsions et leur emploi pour la synthèse de matériaux polymères morphologiquement complexes
The aim of this work was to develop and to study the performances of a low pressure elongational-flow microprocess for the production of size-controlled polymerizable nanoemulsions with narrow size distributions. Nanodroplets diameter was easily tuned in the size range 50-300 nm by varying the process parameters, namely the reciprocating flow rate through the micromixer, the number of cycles and the characteristic dimension of the microchannel. Obtained nanoemulsions were in a second step thermally or UV-assisted polymerized to give colloidal suspensions of size-tunable polymer nanoparticles (87-360 nm). Then, a proper monomer, crosslinker and thermal- or photo-initiator were added to the continuous phase of these nanosupensions. The resulting mixtures were used as the dispersed phases of two different capillaries-based microfluidic droplet generators. The produced sizecontrolled microdroplets were finally UV polymerized online and plain as well as core-shell composite polymeric microparticles doped with lower scale polymer nanoparticles were obtained. Composite/hybrid polymeric core-shell microparticles were also synthesized for which gold nanoparticles in the core and silver nanoparticles in the shell were synthesized in situ from their salt precursors during microdroplets polymerization. This work has demonstrated the high efficiency of a novel low energy microfluidic emulsification device for the production of nanoemulsions which were used for the synthesis of morphologically complex polymeric materials

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El, Kissi Nadia. "Stabilité des écoulements mixtes de polymères fondus : [thèse en partie soutenue sur un ensemble de travaux]." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0046.

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Etude de fluides silicones. Comportement en cisaillement a l'aide d'un rheometre cone-plan ou capillaire. Existence de deux zones de recirculation en amont de la contraction. Localisation du defaut de peau de requin a la sortie des filieres (rupture par fissuration du fluide). Instabilite de l'ecoulement. Etude de la forme des filieres en filage textile

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Hagen, Thomas Ch. "Elongational Flows in Polymer Processing." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29437.

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The production of long, thin polymeric fibers is a main objective of the textile industry. Melt-spinning is a particularly simple and effective technique. In this work, we shall discuss the equations of melt-spinning in viscous and viscoelastic flow. These quasilinear hyperbolic equations model the uniaxial extension of a fluid thread before its solidification. We will address the following topics: first we shall prove existence, uniqueness, and regularity of solutions. Our solution strategy will be developed in detail for the viscous case. For non-Newtonian and isothermal flows, we shall outline the general ideas. Our solution technique consists of energy estimates and fixed-point arguments in appropriate Banach spaces. The existence result for a simple transport equation is the key to understanding the quasilinear case. The second issue of this exposition will be the stability of the unforced frost line formation. We will give a rigorous justification that, in the viscous regime, the linearized equations obey the ``Principle of Linear Stability''. As a consequence, we are allowed to relate the stability of the associated strongly continuous semigroup to the numerical resolution of the spectrum of its generator. By using a spectral collocation method, we shall derive numerical results on the eigenvalue distribution, thereby confirming prior results on the stability of the steady-state solution.
Ph. D.

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V, Venkataramanan. "Material characterization in elongational flows /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487943610784079.

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Books on the topic "Elongational flow"

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Nguyen, Tuan Quoc, and Hans-Henning Kausch, eds. Flexible Polymer Chains in Elongational Flow. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3.

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Nguyen, Tuan Quoc. Flexible Polymer Chains in Elongational Flow: Theory and Experiment. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999.

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McGinness, Ann M. Evaluation of shear and elongational flow regimes on the oscillatory rheological properties of a model of chocolate. Birmingham: University of Birmingham, 1996.

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1949-, Nguyen Q. Tuan, and Kausch H. H, eds. Flexible polymer chains in elongational flow: Theory and experiment. Berlin: Springer, 1999.

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(Editor), Tuan Q. Nguyen, and Hans-Henning Kausch (Editor), eds. Flexible Polymer Chains in Elongational Flow: Theory and Experiment. Springer, 1999.

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Escudier, Marcel. Basic equations of viscous-fluid flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0015.

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In this chapter it is shown that application of the momentum-conservation equation (Newton’s second law of motion) to an infinitesimal cube of fluid leads to Cauchy’s partial differential equations, which govern the flow of any fluid satisfying the continuum hypothesis. Any fluid flow must also satisfy the continuity equation, another partial differential equation, which is derived from the mass-conservation equation. It is shown that distortion of a flowing fluid can be split into elongational distortion and angular distortion or shear strain. For a Newtonian fluid, the normal and shear stresses in Cauchy’s equations are related to the elongational and shear-strain rates through Stokes’ constitutive equations. Substitution of these constitutive equations into Cauchy’s equations leads to the Navier-Stokes equations, which govern steady or unsteady flow of a fluid. A minor modification of the constitutive equations for a Newtonian fluid allows consideration of generalised Newtonian fluids, for which the viscosity depends upon the shear-strain rates. The boundary conditions for the tangential and normal velocity components are discussed briefly.

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Muders, Thomas, and Christian Putensen. Pressure-controlled mechanical ventilation. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0096.

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Beside reduction in tidal volume limiting peak airway pressure minimizes the risk for ventilator-associated-lung-injury in patients with acute respiratory distress syndrome. Pressure-controlled, time-cycled ventilation (PCV) enables the physician to keep airway pressures under strict limits by presetting inspiratory and expiratory pressures, and cycle times. PCV results in a square-waved airway pressure and a decelerating inspiratory gas flow holding the alveoli inflated for the preset time. Preset pressures and cycle times, and respiratory system mechanics affect alveolar and intrinsic positive end-expiratory (PEEPi) pressures, tidal volume, total minute, and alveolar ventilation. When compared with flow-controlled, time-cycled (‘volume-controlled’) ventilation, PCV results in reduced peak airway pressures, but higher mean airway. Homogeneity of regional peak alveolar pressure distribution within the lung is improved. However, no consistent data exist, showing PCV to improve patient outcome. During inverse ratio ventilation (IRV) elongation of inspiratory time increases mean airway pressure and enables full lung inflation, whereas shortening expiratory time causes incomplete lung emptying and increased PEEPi. Both mechanisms increase mean alveolar and transpulmonary pressures, and may thereby improve lung recruitment and gas exchange. However, when compared with conventional mechanical ventilation using an increased external PEEP to reach the same magnitude of total PEEP as that produced intrinsically by IRV, IRV has no advantage. Airway pressure release ventilation (APRV) provides a PCV-like squared pressure pattern by time-cycled switches between two continuous positive airway pressure levels, while allowing unrestricted spontaneous breathing in any ventilatory phase. Maintaining spontaneous breathing with APRV is associated with recruitment and improved ventilation of dependent lung areas, improved ventilation-perfusion matching, cardiac output, oxygenation, and oxygen delivery, whereas need for sedation, vasopressors, and inotropic agents and duration of ventilator support decreases.

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Book chapters on the topic "Elongational flow"

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Gooch, Jan W. "Elongational Flow." In Encyclopedic Dictionary of Polymers, 264. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4348.

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Borisov, O. V., and A. A. Darinskii. "Stretching of Polyelectrolytes in Elongational Flow." In Flexible Polymer Chains in Elongational Flow, 73–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_5.

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de Gennes, P. G. "Tortured Chains: An Introduction." In Flexible Polymer Chains in Elongational Flow, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_1.

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Perkins, T. T., D. E. Smith, and S. Chu. "Single Polymers in Elongational Flows: Dynamic, Steady-State, and Population-Averaged Properties." In Flexible Polymer Chains in Elongational Flow, 283–334. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_10.

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Müller, A. J., and A. E. Sáez. "The Rheology of Polymer Solutions in Porous Media." In Flexible Polymer Chains in Elongational Flow, 335–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_11.

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Ryckaert, Jean-Paul, and Carlo Pierleoni. "Polymer Solutions in Flow: A Non-Equilibrium Molecular Dynamics Approach." In Flexible Polymer Chains in Elongational Flow, 5–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_2.

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Brochard-Wyart, F., and A. Buguin. "Tethered Polymer Chains under Strong Flows: Stems and Flowers." In Flexible Polymer Chains in Elongational Flow, 41–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_3.

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Rabin, Yitzhak, and Shlomo Alexander. "Osmotic Pressure in Solutions of Stretched Polymers." In Flexible Polymer Chains in Elongational Flow, 67–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_4.

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Laso, Manuel, Marco Picasso, and Hans Christian Öttinger. "Calculation of Flows with Large Elongational Components: CONNFFESSIT Calculation of the Flow of a FENE Fluid in a Planar 10:1 Contraction." In Flexible Polymer Chains in Elongational Flow, 101–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_6.

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Odell, J. A., and S. P. Carrington. "Polymer Solutions in Strong Stagnation Point Extensional Flows." In Flexible Polymer Chains in Elongational Flow, 137–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58252-3_7.

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Conference papers on the topic "Elongational flow"

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Odell, J. A., and A. Keller. "Macromolecules in elongational flow-fields." In AIP Conference Proceedings Volume 137. AIP, 1986. http://dx.doi.org/10.1063/1.35515.

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Ouchi, Mayumi, Takatsune Narumi, Tomiichi Hasegawa, Tsutomu Takahashi, Masataka Shirakashi, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Elongational Deformation of DNA Polymers in Micro Flow." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964908.

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Kheirandish, Saeid, Ilshat Guybaidullin, Wendel Wohlleben, Norbert Willenbacher, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Shear and Elongational Flow Behavior of Inhomogeneous, Acrylic Thickener Solutions." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964758.

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Ciocanel, Constantin, Glenn Lipscomb, and Nagi G. Naganathan. "Evaluation of a Constitutive Equation for Magnetorheological Fluids in Shear and Elongational Flows." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79974.

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A microstructural model of the motion of particle pairs in MR fluids is proposed that accounts for both hydrodynamic and magnetic field forces. A fluid constitutive equation is derived from the model that allows prediction of velocity and particle structure fields. Results for simple shear and elongational flows are presented for cases where particle pairs remain in close contact so they are hydrodynamically equivalent to an ellipsoid of aspect ratio two. Additionally, only the magnetic force component normal to the vector connecting the centers of a particle pair affects motion. Shear flow results indicate particle pairs rotate continuously with the flow at low magnetic fields while a steady state is reached at high fields. For elongational flows, when the applied magnetic field is parallel to the elongation direction, particle pairs orient in the field/flow direction. Either orientation is possible when the field is perpendicular to the flow.

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Wagner, M. H., V. H. Rolón-Garrido, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Verification of Branch Point Withdrawal in Elongational Flow of Pom-Pom Polystyrene Melt." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964711.

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Tahir, M., R. E. Hincapie, M. Be, and L. Ganzer. "Experimental Evaluation of Polymer Viscoelasticity During Flow in Porous Media: Elongational and Shear Analysis." In SPE Europec featured at 79th EAGE Conference and Exhibition. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/185823-ms.

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Wagner, Manfred H., and Víctor H. Rolón-Garrido. "Elongational flow of polymer melts at constant strain rate, constant stress and constant force." In NOVEL TRENDS IN RHEOLOGY V. AIP, 2013. http://dx.doi.org/10.1063/1.4802612.

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Venerus, David, Teresita Guadarrama-Medina, Tai-Yi Shiu, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "A Continuous Lubricated Squeezing Flow Technique to Study the Rheological Behavior of Polymer Melts in Equibiaxial Elongational Flow." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964510.

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Paolo, La Mantia Francesco, Ceraulo Manuela, Mistretta Maria Chiara, Sutera Fiorenza, and Ascione Laura. "Effect of polarity and elongational flow on the morphology and properties of a new nanobiocomposite." In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937307.

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Ushida, Akiomi, Tomiichi Hasegawa, Hiroshige Uchiyama, and Takatsune Narumi. "Flow Properties for Several Kinds of Liquid Flows Through Micro-Orifices." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-14003.

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Abstract:

In this paper, the flow properties of several types of liquid passing through various sizes of micro-orifices were investigated. The jet thrust and pressure drops were measured for two polyethylene glycol solutions and four surfactant solutions. Different flow properties were found for the various surfactant solutions depending on the charge of the solute. For an anionic surfactant, the results were similar to those for water, whereas in the case of a cationic surfactant, both the jet thrust and pressure decreased greatly in comparison with the other test liquids. Finally, a nonionic surfactant exhibited a steep rise in the pressure drop at a particular value of the Reynolds number. In explaining this behavior, the liquid-solid interface and alignment of the surfactant molecules are considered, and consequently, it is strongly suggested that the elastic stress on elongational flows is a contributing factor. In addition, the decreases in pressure and thrust for polyethylene glycols are attributed to viscoelastic properties, regardless of the molecular weight of PEG.

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