Rheology of Semiconcentrated Fiber Suspensions PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Rheology of Semiconcentrated Fiber Suspensions PDF full book. Access full book title Rheology of Semiconcentrated Fiber Suspensions by Miguel Angel Bibbó. Download full books in PDF and EPUB format.
Author: Miguel Angel Bibbó
Publisher:
ISBN:
Category :
Languages : en
Pages : 680
Get Book Here
Book Description
Author: Miguel Angel Bibbó
Publisher:
ISBN:
Category :
Languages : en
Pages : 680
Get Book Here
Book Description
Author: Francisco Chinesta
Publisher: Elsevier
ISBN: 0081008120
Category : Science
Languages : en
Pages : 398
Get Book Here
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:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Rheological and mass transfer properties of non-Brownian fiber suspensions are affected by fiber characteristics, fiber interactions, and processing conditions. In this thesis we develop several simulation methods to study the dynamics of single fibers in simple shear flow, as well as the rheology and mass transfer of fiber suspensions. Isolated, rigid, neutrally-buoyant, non-Brownian, slightly curved, nonchiral fibers in simple shear flow of an incompressible Newtonian fluid at low Reynolds number can drift steadily in the gradient direction without external forces or torques. The average drift velocity and direction depend on the fiber aspect ratio, curvature and initial orientation. The drift results from the coupling of rotational and translational dynamics, and the combined effects of flipping, scooping, and spinning motions of the fiber. Irreversible fiber collisions in the suspensions cause shear-induced diffusion. The shear-induced self-diffusivity of dilute suspensions of fibers increases with increasing concentration and increasing static friction between contacts. The diffusivities in both the gradient and vorticity directions are larger for suspensions of curved fibers than for suspensions of straight fibers. For suspensions of curved fibers, significant enhancements in the diffusivity in the gradient direction are attributed to fiber drift in the gradient direction. The shear-induced self-diffusivity of concentrated suspensions of fibers increases with increasing concentration before fiber networks or flocs are formed, after which the diffusivity decreases with increasing concentration. The diffusivity increases with increasing fiber equilibrium bending angle, effective stiffness, coefficient of static friction, and rate of collisions. The specific viscosity of fiber suspensions increases with increasing fiber curvature, friction coefficient between mechanical contacts, and solids concentration. The specific viscosity increases linearly with concentration in the dilute regime, and increases with the cube of the concentration in the semi-dilute regime. Concentrated fiber suspensions are highly viscous, shear thinning, and exhibit significant yield stresses and normal stress differences. Yield stresses scale with volume concentration and fiber aspect ratio in the same way as that observed in experiments. The first normal stress difference increases linearly with shear rate. The shear-induced diffusivity increases linearly with the derivative of the particle contribution to stress for dilute suspensions with respective to concentration. This correlation between rheology and shear-induced diffusion makes it possible to predict diffusivity from easily measured rheological properties.
Author: Mahdi Keshtkar
Publisher:
ISBN: 9780494537992
Category :
Languages : en
Pages : 212
Get Book Here
Book Description
Author: Michael Philip Petrich
Publisher:
ISBN:
Category :
Languages : en
Pages : 438
Get Book Here
Book Description
Author: Dane Robert Boyington
Publisher:
ISBN:
Category :
Languages : en
Pages : 804
Get Book Here
Book Description
Author: Richard O. Maschmeyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Get Book Here
Book Description
Capillary viscometer measurements were made on a series of concentrated suspensions with the same fiber length distribution. Shear stress-shear rate data are reported for 0, 15, and 30 vol.% glass fiber suspensions in 100, 600, and 1000 P silicone oil. Yield stresses, wall effects, concentration defects, squeeze-through, and capillary entrance exclusion were not significant in the measurements. With other parameters held constant, the suspension viscosity increased with oil viscosity. The data were fit by a dimensionless plot of the form F(fRe, De) = 0 where f is the friction factor for tube flow and Re and De are the Reynolds and Deborah numbers of the system. The suspension viscosity increased with fiber concentration, but the magnitude of the increase was highly shear rate dependent. The data are compared with literature predictions for the dependence of suspension viscosity on fiber concentration and shear rate.
Author:
Publisher:
ISBN:
Category : Rheology
Languages : en
Pages : 480
Get Book Here
Book Description
Author: Rakesh K. Gupta
Publisher: CRC Press
ISBN: 1482273705
Category : Technology & Engineering
Languages : en
Pages : 409
Get Book Here
Book Description
An analysis of polymer and composite rheology. This second edition covers flow properties of thermoplastic and thermoset polymers, and general principles and applications of all phases of polymer rheology, with new chapters on the rheology of particulate and fibre composites. It also includes new and expanded detail on polymer blends and emulsions,
Author: T.D. Papathanasiou
Publisher: Woodhead Publishing
ISBN: 0128185759
Category : Technology & Engineering
Languages : en
Pages : 399
Get Book Here
Book Description
The purpose of aligning short fibers in a fiber-reinforced material is to improve the mechanical properties of the resulting composite. Aligning the fibers, generally in a preferred direction, allows them to contribute as much as possible to reinforcing the material. The first edition of this book detailed, in a single volume, the science, processing, applications, characterization and properties of composite materials reinforced with short fibers that have been orientated in a preferred direction by flows arising during processing. The technology of fiber-reinforced composites is continually evolving and this new edition provides timely and much needed information about this important class of engineering materials. Each of the original chapters have been brought fully up-to-date and new developments such as: the advent of nano-composites and the issues relating to their alignment; the wider use of long-fiber composites and the appearance of models able to capture their orientation during flow; the wider use of flows in micro-channels in the context of composites fabrication; and the increase in computing power, which has made relevant simulations (especially coupling flow kinematics to fiber content and orientation) much easier to perform are all covered in detail. The book will be an essential up-to-date reference resource for materials scientists, students, and engineers who are working in the relevant areas of particulate composites, short fiber-reinforced composites or nanocomposites. - Presents recent progress on flow-induced alignment, modelling and design of fiber and particulate filled polymer composites - Discusses important advances such as alignment of CNTs in polymer nanocomposites and molecular alignment of polymers induced by the injection molding process in the presence of fillers such as short fibers - Presents fiber interaction/diffusion modelling and also the fiber flexure/breakage models
