3D simulations of the flow of thixotropic fluids, in large-gap Couette and vane-cup geometries

Potanin, Andrei

doi:10.1016/j.jnnfm.2010.01.004

Cited by 39 publications

(21 citation statements)

References 17 publications

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“…If the interblade space does not behave as a rigid body, i.e., if vortices and secondary flows occur, the boundary conditions are changed at the periphery of the blades, which makes it difficult any viscometric treatment of the data. The suspension behavior within the blades have been studied numerically (Savarmand et al 2007;Potanin 2010), but there has been no experimental investigation to date. As far as we know, our experiments are the first report of flow recirculation within vane blades in a Couette cell.…”

Section: Resultsmentioning

confidence: 99%

Refractive-index and density matching in concentrated particle suspensions: a review

et al. 2010

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Optical measurement techniques such as particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) are now routinely used in experimental fluid mechanics to investigate pure fluids or dilute suspensions. For highly concentrated particle suspensions, material turbidity has long been a substantial impediment to these techniques, which explains why they have been scarcely used so far. A renewed interest has emerged with the development of specific methods combining the use of iso-index suspensions and imaging techniques. This review paper gives a broad overview of recent advances in visualization techniques suited to concentrated particle suspensions. In particular, we show how classic methods such as PIV, LDV, particle tracking velocimetry, and laser induced fluorescence can be adapted to deal with concentrated particle suspensions.

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Section: Resultsmentioning

confidence: 99%

Refractive-index and density matching in concentrated particle suspensions: a review

et al. 2010

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“…[4][5][6][7][8][9][10][11][12][13][14] A thixotropic fluid model which excludes complications arising from viscoelastic effects (thereby enabling one to focus on just the effect of thixotropic parameters on the flow characteristics) is the Moore's structural model.…”

Section: -3)mentioning

confidence: 99%

Lubricating Flow of Thixotropic Fluids in Slipper-Pad Bearing: A Numerical Study

Najmi

Karimzadeh

Sadeghy

2011

J. Soc. Rheol., Jpn

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Laminar, two-dimensional flow of an incompressible thixotropic fluid obeying Moore's model is investigated numerically in a slipper-pad bearing using FVM method. Results will be presented addressing the effect of thixotropic properties and inclination angle on the pressure distribution and load-carrying capacity of the bearing. It is shown that the pressure distribution under the upper pad depends only on the buildup-to-breakdown ratio. It is also predicted that by increasing this ratio, the load-carrying capacity increases, but, the pressure distribution becomes more and more asymmetric with the maximum pressure shifting towards the outlet section of the bearing. Also, for any given set of Moore's model parameters, an increase in the inclination angle is shown to linearly increase the load-carrying capacity of the bearing at small angles. Above a critical inclination angle, however, the rise in the load-carrying capacity becomes nonlinear. Also, by increasing the inclination angle, the location for the occurrence of maximum pressure shifts towards the outlet section of the bearing.

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“…(Billingham & Ferguson [14] also incorporated a structure diffusion term, but this has been less widely adopted.) A somewhat more intricate model, with different behaviours during local build-up and breakdown, has recently been developed and applied to flows in rheometers [20].…”

Section: Introductionmentioning

confidence: 99%

The Stokes boundary layer for a thixotropic or antithixotropic fluid

McArdle

Pritchard

Wilson

2012

Journal of Non-Newtonian Fluid Mechanics

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We present a mathematical investigation of the oscillatory boundary layer ('Stokes layer') in a semi-infinite fluid bounded by an oscillating wall (the socalled 'Stokes problem'), when the fluid has a thixotropic or antithixotropic rheology. We obtain asymptotic solutions in the limit of small-amplitude oscillations, and we use numerical integration to validate the asymptotic solutions and to explore the behaviour of the system for larger-amplitude oscillations. The solutions that we obtain differ significantly from the classical solution for a Newtonian fluid. In particular, for antithixotropic fluids the velocity reaches zero at a finite distance from the wall, in contrast to the exponential decay for a thixotropic or a Newtonian fluid.For small amplitudes of oscillation, three regimes of behaviour are possible: the structure parameter may take values defined instantaneously by the shear rate, or by a long-term average; or it may behave hysteretically. The regime boundaries depend on the precise specification of structure build-up * Corresponding author. E-mail: david.pritchard@strath.ac.uk. Tel.: (+44)(0)141 548 3819. Fax: (+44)(0)141 548 3345.Preprint submitted to Journal of Non-Newtonian Fluid Mechanics June 12, 2012 and breakdown rates in the rheological model, illustrating the subtleties of complex fluid models in non-rheometric settings. For larger amplitudes of oscillation the dominant behaviour is hysteretic. We discuss in particular the relationship between the shear stress and the shear rate at the oscillating wall.

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3D simulations of the flow of thixotropic fluids, in large-gap Couette and vane-cup geometries

Cited by 39 publications

References 17 publications

Refractive-index and density matching in concentrated particle suspensions: a review

Refractive-index and density matching in concentrated particle suspensions: a review

Lubricating Flow of Thixotropic Fluids in Slipper-Pad Bearing: A Numerical Study

The Stokes boundary layer for a thixotropic or antithixotropic fluid

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