Oscillatory strain with superposed steady shearing in noncolloidal suspensions

2020 ◽  
Vol 64 (5) ◽  
pp. 1087-1106
Author(s):  
Arif Mahmud ◽  
Shaocong Dai ◽  
Roger I. Tanner
Keyword(s):  
Steady Shearing ◽  
Noncolloidal Suspensions

Vanadium Pentoxide Gels: Structural Development and Rheological Properties

1990 ◽  
Vol 180 ◽  
Author(s):  
J.K. Bailey ◽  
T. Nagase ◽  
G.A. Pozarnsky ◽  
M.L. Mecartney
Keyword(s):  
Vanadium Pentoxide ◽  
Structural Development ◽  
Small Particles ◽  
Rheological Characterization ◽  
Cryogenic Transmission Electron Microscopy ◽  
Transmission Electron ◽  
Before And After ◽  
Constant Shear Stress ◽  
Steady Shearing ◽  
Rheological Experiments

ABSTRACTCryogenic transmission electron Microscopy (cryo-TEM) and rheological characterization were conducted in order to understand structural development of vanadium pentoxide gels during processing. Sols were prepared by ion exchange from sodium metavanadate solutions. Cryo-TEM revealed that fine threads about 1.5nm wide initially form and grow into ribbons approximately 25nm wide and at least 1000nm long. The threads appear to self assemble into the ribbons. During this structural development, the dynamic viscosity increased. Upon steady shearing of the sols, the system exhibited thixotropy, i.e. the viscosity decreased with time under constant shear stress and subsequently rheopexy, the viscosity increased with time. Comparison of the structure before and after shearing indicated that during the rheological experiments aggregation of small particles or fragments was occurring.

Elasticity and plasticity of highly concentrated noncolloidal suspensions under shear

2020 ◽  
Vol 64 (2) ◽  
pp. 469-479 ◽  
Author(s):  
A. Ya. Malkin ◽  
A. V. Mityukov ◽  
S. V. Kotomin ◽  
A. A. Shabeko ◽  
V. G. Kulichikhin
Keyword(s):  
Noncolloidal Suspensions

Effects of particle properties on the rheology of concentrated noncolloidal suspensions

1992 ◽  
Vol 36 (7) ◽  
pp. 1291-1305 ◽  
Author(s):  
S. C. Tsai ◽  
D. Botts ◽  
J. Plouff
Keyword(s):  
Particle Properties ◽  
Noncolloidal Suspensions

Rheology and microstructure in concentrated noncolloidal suspensions

2002 ◽  
Vol 46 (5) ◽  
pp. 1031-1056 ◽  
Author(s):  
A. Sierou ◽  
J. F. Brady
Keyword(s):  
Noncolloidal Suspensions

Prediction of the dispersion of particle clusters in the nano-scale—Part I: Steady shearing responses

2006 ◽  
Vol 61 (2) ◽  
pp. 473-488 ◽  
Author(s):  
Maddalena Fanelli ◽  
Donald L. Feke ◽  
Ica Manas-Zloczower
Keyword(s):  
Nano Scale ◽  
Steady Shearing

The Thickness of Steady Plane Shear Flows of Circular Disks Driven by Identical Boundaries

1988 ◽  
Vol 55 (4) ◽  
pp. 969-974 ◽  
Author(s):  
D. M. Hanes ◽  
J. T. Jenkins ◽  
M. W. Richman
Keyword(s):  
Relative Motion ◽  
Constitutive Relations ◽  
Balance Laws ◽  
Plane Shear ◽  
Normal Traction ◽  
Steady Solutions ◽  
Steady Shearing ◽  
Steady Plane ◽  
Steady Motions ◽  
Circular Disks

We employ balance laws and constitutive relations for rapid, dense, plane flows of identical circular disks together with boundary conditions at a bumpy wall to analyse steady shearing flows maintained by the relative motion of two identical, parallel walls. The disks and the walls are assumed to be frictionless and nearly elastic. Given the properties of the flowing disks, those of the boundary, and the ratio of the tangential and normal tractions applied to the boundary, we determine what the distance between the walls must be for a steady solution to be possible. For these steady solutions we relate the velocity of the walls to the normal and tangential tractions applied to them. We find that in certain circumstances steady motions may be maintained even when the ratio of tangential to normal traction is much less than its value in a homogeneous simple shear. In the Appendix, the corresponding results for spheres are outlined.

Non-Newtonian effects in steady motion of some idealized elastico-viscous liquids

1958 ◽  
Vol 245 (1241) ◽  
pp. 278-297 ◽  
Keyword(s):  
Steady Flow ◽  
Apparent Viscosity ◽  
Steady Motion ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Straight Pipe ◽  
Shearing Flow ◽  
Viscous Liquids ◽  
Variable Shear ◽  
Steady Shearing

Normal-stress effects and the variation of apparent viscosity with rate of shear in simple types of steady flow of certain idealized elastico-viscous liquids are discussed. The liquids are those whose behaviour at sufficiently small variable shear stresses can be characterized by three constants (a coefficient of viscosity, a relaxation time and a retardation time) and whose invariant differential equations of state for general motion (involving eight independent physical constants) are linear in the stresses and include terms of no higher degree than the second in the stresses and velocity gradients together. The normal stresses which, in addition to shear stresses, are present in such a liquid in a state of simple shearing flow, or in flow in a circular pipe, or between rotating cylinders, are investigated; and the conditions under which the Weissenberg climbing effect will occur, in a positive or negative sense, are examined. In many liquids of this class, steady rectilinear flow under a uniform pressure gradient is not always possible in a straight pipe of arbitrary section, nor is steady flow in horizontal circles in a region bounded by arbitrary surfaces of revolution in relative rotation about common vertical axis. The behaviour of these idealized liquids when sheared in a narrow gap between a rotating wide-angled cone and a flat plate is compared with the observations of Roberts (1952, 1953) on some real elastico-viscous liquids. Certain liquids of this class, characterized by six independent constants satisfying certain inequalities, exhibit rheological behaviour which is, at least qualitatively, similar to the behaviour of many real elastico-viscous liquids in the following respects: the behaviour at small variable shear stresses, the variation of apparent viscosity with rate of steady shearing, the climbing effect up a vertical rod rotated in the liquid, and a distribution of normal stresses equivalent to an extra tension along the streamlines (with an isotropic state of stress in the plane normal to the streamlines) which is present in all the simple types of steady shearing flow investigated. These liquids can flow steadily in straight lines through a straight pipe of any section.

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