Book ChapterDOI
The normal stress behaviour of suspensions with viscoelastic matrix fluids
TLDR
In this article, the first and second normal stress difference of viscoelastic suspensions are investigated for all suspensions and N 2 in comparison to N is of special interest for the first normal stress differences.Abstract:
Normal stresses in viscoelastic suspensions may have similar amounts as the shear stresses. So the first and second normal stress difference of such materials are of high interest. Especially the second normal stress differences are unknown for all suspensions. To investigate N 2 in comparison to N is of special interest.read more
Citations
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Journal ArticleDOI
Rheology of non-Brownian suspensions.
Morton M. Denn,Jeffrey F. Morris +1 more
TL;DR: The observed rheological behavior is reviewed, emphasizing concentrated suspensions of spheres in Newtonian fluids, and both particle-level and continuum approaches to describing the nonlinear behavior are examined.
Journal ArticleDOI
Direct simulations of particle suspensions in a viscoelastic fluid in sliding bi-periodic frames
TL;DR: In this article, a finite element scheme for direct simulation of inertialess particle suspensions in simple shear flows of Oldroyd-B fluids is presented, where the bulk stress is obtained by simple boundary integrals of Lagrangian multipliers along the domain and particles.
Journal ArticleDOI
Thin film and high shear rheology of multiphase complex fluids
TL;DR: In this paper, the authors explore the high-shear and gap-dependent properties of multiphase complex fluids using narrow-gap parallel-plate rheometry and demonstrate that the parallel plate geometry is capable of accessing extremely high shear rates (e.g. 10(5) s(-1)) using narrow gap heights (5-100 mu m) for Newtonian, shear-thinning, and elastic fluids.
Journal ArticleDOI
Primary and secondary normal stress differences of a magnetorheological fluid (MRF) up to magnetic flux densities of 1 T
TL;DR: In this article, a commercial plate-plate magneto-rheometer (Anton Paar GmbH) was used to verify the normal stress difference ratio and to support the conjecture that the positive but small N2 is a consequence of the densely packed magnetorheological fluid.
Journal ArticleDOI
Tailored Nanocomposites of Polypropylene with Layered Silicates
TL;DR: In this article, the melt rheological properties of layered silicate nanocomposites with maleic anhydride functionalized polypropylene are contrasted to those based on ammonium-terminated polyethylene.
References
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Journal ArticleDOI
The characterization of the total stress of concentrated suspensions of noncolloidal spheres in Newtonian fluids
TL;DR: In this paper, the normal stress in the vorticity direction (Σ33) for a suspension undergoing simple shear was extracted from Acrivos et al. [Int. J. Multiphase Flow 19, 797] resuspension data in a Couette device.
Journal ArticleDOI
Experimental investigations of shear and elongational flow properties of polystyrene melts reinforced with calcium carbonate, titanium dioxide, and carbon black
Hideho Tanaka,James L. White +1 more
TL;DR: In this article, shear and elongational flow measurements on polystyrene melts reinforced with small particles were carried out, and the influences of loading level, particle size, and surface treatment on shear viscosity, principal normal stress difference, and length of elongation were discussed.
Journal ArticleDOI
Brownian Dynamics simulation of hard-sphere colloidal dispersions
David R. Foss,John F. Brady +1 more
TL;DR: In this paper, the rheology of hard-sphere suspensions in the absence of hydrodynamic interactions is examined by Brownian Dynamics and simulations are performed over a wide range of volume fraction φ and Peclet number Pe=γa2/D, where φ is the shear rate and D =kT/6ππηa is the Stokes-Einstein diffusivity of an isolated spherical particle of radius a and thermal energy kT in a fluid of viscosity η.
Journal ArticleDOI
Normal stresses in colloidal dispersions
John F. Brady,Michael Vicic +1 more
TL;DR: In this article, normal stresses in colloidal dispersions at low shear rates are determined theoretically for both dilute and concentrated suspensions of Brownian hard spheres, and the scaling theory predicts that the dominant contribution to the stress comes from Brownian motion and scales as Peg(2;φ)/Ds0(φ), where g(2,φ) is the equilibrium radial distribution function at contact and Ds0 is the short-time selfdiffusivity at the volume fraction φ.