Experimental and Computational Studies of Gravity-Driven Dense Granular Flows PDF Download
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Author: Yesaswi Narendra Chilamkurti
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Author: Yesaswi Narendra Chilamkurti
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Book Description
Author: Jeffrey Olafsen
Publisher: Cambridge University Press
ISBN: 113948981X
Category : Science
Languages : en
Pages : 339
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Book Description
Soft condensed matter physics relies on a fundamental understanding at the interface between physics, chemistry, biology, and engineering for a host of materials and circumstances that are related to, but outside, the traditional definition of condensed matter physics. Featuring contributions from leading researchers in the field, this book uniquely discusses both the contemporary experimental and computational manifestations of soft condensed matter systems. From particle tracking and image analysis, novel materials and computational methods, to confocal microscopy and bacterial assays, this book will equip the reader for collaborative and interdisciplinary research efforts relating to a range of modern problems in nonlinear and non-equilibrium systems. It will enable both graduate students and experienced researchers to supplement a more traditional understanding of thermodynamics and statistical systems with knowledge of the techniques used in contemporary investigations. Color versions of a selection of the figures are available at www.cambridge.org/9780521115902.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Rapid, gravity-driven flows of granular materials down inclines pose a challenge to our understanding. Even in situations in which the flow is steady and two-dimensional, the details of how momentum ad energy are balanced within the flow and at the bottom boundary are not well understood. Thus we have undertaken a research program integrating theory, computer simulation, and experiment that focuses on such flows. the effort involves the development of theory informed by the results of simultaneous computer simulations and the construction, instrumentation, and use of an experimental facility in which the variables necessary to assess the success or failure of the theory can be measured. A goal of the project is to provide a sound theoretical and experimental base for a better understanding of the behavior and properties of multiphase flow and solid transport.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
Rapid, gravity-driven flows of granular materials down inclines pose a challenge to our understanding. Even in situations in which the flow is steady and two-dimensional, the details of how momentum and energy are balanced within the flow and at the bottom boundary are not well understood. Thus we have undertaken a research program integrating theory, computer simulation, and experiment that will focus on dense entry flows down inclines. Its goal is to understand the regime of inclined flow that involves a large, relatively passive mass of granular material moving above a narrow region of intensely sheared, colliding grains. The effort involves the development of theory informed by the results of simultaneous computer simulations and the construction, instrumentation, and use of an experimental facility in which the variables necessary to assess the success or failure of the theory can be measured. In the presetn reporting period, we have completed a series of experiments to measure the collision properties of various small particles. Results for 3mm glass beads are presented here. In addition, we have made progress in the design of a new sensor to measure simultaneously the particle volume fraction near the wall and the normal force of impact from individual collisions. Finally, we have conducted additional simulations of the rapid granular flows of spheres interacting with a flat, frictional wall. The objective was to generate semi-empirical expressions for the boundary conditions imposed by the wall on the flow.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
The authors report and analyze the results of numerical studies of dense granular flows in two and three dimensions, using both linear damped springs and Hertzian force laws between particles. Chute flow generically produces a constant density profile that satisfies scaling relations suggestive of a Bagnold grain inertia regime. The type for force law has little impact on the behavior of the system. Failure is not initiated at the surface, consistent with the absence of surface flows and different principal stress directions at vs. below the surface.
Author: Jaime Klapp
Publisher: Springer Science & Business Media
ISBN: 3319001167
Category : Science
Languages : en
Pages : 471
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Book Description
This book collects invited lectures and selected contributions presented at the Enzo Levi and XVIII Annual Meeting of the Fluid Dynamic Division of the Mexican Physical Society in 2012. It is intended for fourth-year undergraduate and graduate students, and for scientists in the fields of physics, engineering and chemistry with an interest in Fluid Dynamics from experimental, theoretical and computational points of view. The invited lectures are introductory in nature and avoid the use of complicated mathematics. The other selected contributions are also suitable for fourth-year undergraduate and graduate students. The Fluid Dynamics applications include oceanography, multiphase flows, convection, diffusion, heat transfer, rheology, granular materials, viscous flows, porous media flows and astrophysics. The material presented in the book includes recent advances in experimental and computational fluid dynamics and is well-suited to both teaching and research.
Author: Brian E. Sanders
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 322
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Author: Kevin Facto
Publisher:
ISBN:
Category : Granular materials
Languages : en
Pages : 101
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Book Description
This dissertation presents experiments that studied two gravity driven granular channel flows. The first experiment used magnetic resonance imaging to measure the density and displacement distributions of poppy seeds flowing in a rough walled channel. Time-averaged measurements of normalized velocity and density showed little flow speed dependence. Instantaneous measurements, however, showed marked velocity dependence in the displacement distributions. There was evidence of aperiodic starting and stopping at lower flow speeds and the onset of density waves on a continuous flow at higher speeds. The second experiment measured forces in all three spatial directions at the boundary of a flow of steel balls. The relationship between the normal and the tangential forces were examined statistically and compared to the Coulomb friction model. For both large and small forces, the tangential and normal forces are unrelated, as there appears to be a strong tendency for the tangential force to maintain a value that will bear the weight the weight of the particles in flow.
Author: Luoyilang Ke
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Recently, applying mesh free method coupled with a constitutive rheology has achieved success in modeling dynamics in dry granular flows. However, research on comprehensive validation on the coupled model in different aspects, such as pressure, velocity, shear stress, surface, friction factor and different geometries is limited. In this study, three different cases, including gravity driven flow, 2D column collapse and granular dam-break are simulated to validate the coupled model of MPS method with (I) rheology model, by comparing the simulated results with analytical solutions and experimental results. In the simulations, flow characteristics are successfully captured in dry granular flows in different flow scenarios. In gravity driven flow, MPS reproduces a steady uniform zone in which good agreements have been achieved in terms of pressure, shear stress, friction factor and velocity distribution comparing numerical results with analytical solutions. In 2D column collapse and granular dam-break flow, the MPS has good performance in capturing dynamic features observed and measured in labs. After validation of the coupled model, numerical results pressure, tangential stress and friction factor are analyzed and discussed. It is found that the coupled model can be used to distinguish flow regimes in granular flows according to calculated pressure, stress, and friction factor. In numerical results, non-linear distributions with an obvious change on the free surface for the pressure and stress are observed. This study lays solid examples to show that the MPS method coupled with rheology model is a useful numerical tool to reflect flow characteristics in granular flows. Keywords: MPS, granular flow, rheology model, stress, friction factor.
Author: Michael A. Elliott
Publisher:
ISBN:
Category : Channels (Hydraulic engineering)
Languages : en
Pages : 226
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Book Description
