Dynamics and Rheology of Particulate Suspensions Undergoing Steady and Unsteady Shear Flows PDF Download
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Author: Hyun-Ok Park
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Secondly, the stability and rheology of the single walled carbon nanotube (SWNT) suspensions prepared by interfacial trapping method is examined and compared to a conventional method of ultracentrifugation. Since the rheological properties are sensitive to the suspension microstructure, the change of rheological properties, such as viscosity, can be employed as a systematic standard of stability. The steady shear viscosities have been measured and compared as a function of shear rate and aging time of the suspension. Also, the visual states of the suspension have been observed. The rheology of the SWNT suspensions depends on the preparation of surfactant solution. Also, the interfacial trapping method generated similar behaviors to the SWNT suspension prepared by the ultracentrifugation method. Finally, the dynamics of non-colloidal spheres in oscillatory shear flow is studied by experiment and simulation. Two distinct scales are observed for the development of the rheology in time. At small total strains, a rapid decay of ... is observed, while ... and ... remain constant. However, the evolution of the complex viscosity is observed over large total strains, indicating microstructural changes over long times. Also, this suspension system shows a non-monotonic dependence of viscosity on strain amplitude. Stokesian dynamics simulations are used to correlate the rheology and microstructures.
Author: Hyun-Ok Park
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Secondly, the stability and rheology of the single walled carbon nanotube (SWNT) suspensions prepared by interfacial trapping method is examined and compared to a conventional method of ultracentrifugation. Since the rheological properties are sensitive to the suspension microstructure, the change of rheological properties, such as viscosity, can be employed as a systematic standard of stability. The steady shear viscosities have been measured and compared as a function of shear rate and aging time of the suspension. Also, the visual states of the suspension have been observed. The rheology of the SWNT suspensions depends on the preparation of surfactant solution. Also, the interfacial trapping method generated similar behaviors to the SWNT suspension prepared by the ultracentrifugation method. Finally, the dynamics of non-colloidal spheres in oscillatory shear flow is studied by experiment and simulation. Two distinct scales are observed for the development of the rheology in time. At small total strains, a rapid decay of ... is observed, while ... and ... remain constant. However, the evolution of the complex viscosity is observed over large total strains, indicating microstructural changes over long times. Also, this suspension system shows a non-monotonic dependence of viscosity on strain amplitude. Stokesian dynamics simulations are used to correlate the rheology and microstructures.
Author: Philippe Coussot
Publisher: Routledge
ISBN: 1351429892
Category : Technology & Engineering
Languages : en
Pages : 272
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Book Description
Presenting current knowledge in the field of mudflows, this book includes both rheological mudflow aspects, and information on mudflow characteristics in open channels. It includes sections on: · physical properties of suspensions · shear rheometry with suspensions · rheology of clay-water mixtures · rheology of mud suspensions · gradually and rapidly varied free surface flows Part of the IAHR Monograph Series, this informative book also includes fundamental equations for viscoplastic flows and provides the reader with helpful introductions to all the aspects it covers.
Author: Francisco Chinesta
Publisher: Elsevier
ISBN: 0081008120
Category : Science
Languages : en
Pages : 398
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Book Description
This book provides a review of the current understanding of the behavior of non-spherical particle suspensions providing experimental results, rheological models and numerical modeling. In recent years, new models have been developed for suspension rheology and as a result applications for nanocomposites have increased. The authors tackle issues within experimental, model and numerical simulations of the behavior of particle suspensions. Applications of non-spherical particle suspension rheology are widespread and can be found in organic matrix composites, nanocomposites, biocomposites, fiber-filled fresh concrete flow, blood and biologic fluids. - Understand how to model and predict the final microstructure and properties of particle suspensions - Explores nano, micro, meso and macro scales - Rheology, thermomechanical and electromagnetic physics are discussed
Author: Donald A. Drew
Publisher: Springer
ISBN:
Category : Mathematics
Languages : en
Pages : 168
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Book Description
This IMA Volume in Mathematics and its Applications PARTICULATE FLOWS: PROCESSING AND RHEOLOGY is based on the proceedings of a very successful one-week workshop with the same title, which was an integral part of the 1995-1996 IMA program on "Mathematical Methods in Materials Science." We would like to thank Donald A. Drew, Daniel D. Joseph, and Stephen L. Passman for their excellent work as organizers of the meeting. We also take this opportunity to thank the National Science Foun dation (NSF), the Army Research Office (ARO) and the Office of Naval Research (ONR), whose financial support made the workshop possible. A vner Friedman Robert Gulliver v PREFACE The workshop on Particulate Flows: Processing and Rheology was held January 8-12, 1996 at the Institute for Mathematics and its Applications on the University of Minnesota Twin Cities campus as part of the 1995- 96 Program on Mathematical Methods in Materials Science. There were about forty participants, and some lively discussions, in spite of the fact that bad weather on the east coast kept some participants from attending, and caused scheduling changes throughout the workshop. Heterogeneous materials can behave strangely, even in simple flow sit uations. For example, a mixture of solid particles in a liquid can exhibit behavior that seems solid-like or fluid-like, and attempting to measure the "viscosity" of such a mixture leads to contradictions and "unrepeatable" experiments. Even so, such materials are commonly used in manufacturing and processing.
Author: I-Dee Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Non-linear hydrodynamic interaction on particles suspended in viscous flows was investigated analytically by the method of matched expansions. In particular, three problems of fundamental importance were analyzed. The first problem involves the motion of a particle in an oscillating viscous shear flow. It was found that because of the inertia of the fluid, a lift force is produced on the particle. This force has a d-c component which tends to cause a sidewise drift of the particle. The second problem involves the extension of Jeffery's classical work on the motion of ellipsoidal particle immersed in a viscous shear flow. It was found that the first order outer solution corresponds to gyrating dipoles in a shear flow. The effect of the shear produces a higher order effect than the one caused by the second order non-linear effect in the near field. The third problem dealt with the motion of a spherical particle in a viscous compressible flow. The flow field was calculated in terms of a near field and a far field. The flow pattern is rather complex because of the combined effects of heat conduction and viscosity. (Author).
Author: Philippe Coussot
Publisher: Routledge
ISBN: 1351429884
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Presenting current knowledge in the field of mudflows, this book includes both rheological mudflow aspects, and information on mudflow characteristics in open channels. It includes sections on: · physical properties of suspensions · shear rheometry with suspensions · rheology of clay-water mixtures · rheology of mud suspensions · gradually and rapidly varied free surface flows Part of the IAHR Monograph Series, this informative book also includes fundamental equations for viscoplastic flows and provides the reader with helpful introductions to all the aspects it covers.
Author: Neeraj Nitin Sinai Borker
Publisher:
ISBN:
Category :
Languages : en
Pages : 198
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Book Description
This thesis concerns with the ability to change the properties of particle suspensions in a low Reynolds number simple shear flow over two orders of magnitude by designing shapes of the individual particles. The motion of particles such as rings with sharper outer edges, fibers with non-circular cross-sections or ramified particles can display unusual dynamics by small changes in their respective particle geometries. This work specifically focuses on particles that attain an equilibrium orientation without application of external forces or torques. Rheological properties of a suspension of such self-aligning particles (SAPs), such as intrinsic viscosity, hydrodynamic diffusivity and orientational dispersion, as a function of the particle aspect ratio display a phase transition-like behavior where the value of each of the rheological property drops by an order of magnitude near a critical aspect ratio A*. Using suspension of SAPs, rheological properties such as viscosity can be controlled by small changes in the particle aspect ratio; by adding a small number of tumbling particles to the suspension; or by varying the absolute particle, shear rate and/or the underlying fluid viscosity. This tunability of macroscopic properties of particle suspensions via passive control of the motion of its individual constituent particles opens new opportunities to fabricate functional materials with tunable properties using current processing flow technology such as injection molding or spin casting. A computationally inexpensive boundary element method for axisymmetric particles and a slender body theory accounting for cross-sectional effects on the force distribution of slender filaments, both in any linear flow fields, were developed as part of this thesis. These tools were used to obtain the motion of individual particles with exotic shapes. The suspension rheology was obtained through Brownian dynamics simulations and numerical calculations accounting for pairwise far-field hydrodynamic interactions and along with collisions. The shear rheology of rotating rings was also investigated to demonstrate its differences from the rheology of rotating fibers and discs. With the advancement in manufacturing techniques, self-aligning particle geometries can be accessed using fabrication methods such as 3D printing or lithography thereby allowing for experimental verification of our results and fabrication of functional materials.
Author: R. Byron Bird
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 680
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Book Description
This revision of an introductory text examines Newtonian liquids and polymer fluid mechanics. It begins with a review of the main ideas of fluid dynamics as well as key points of Newtonian fluids.
Author: Chingyi Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 558
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Book Description
Author: Marco Mazzuoli
Publisher: Springer Nature
ISBN: 3031555090
Category :
Languages : en
Pages : 224
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Book Description
