Experimental observations of particle migration in concentrated suspensions: Couette flow

Abbott, James; Tetlow, Nicholas; Graham, Alan L.; Altobelli, Stephen A.; Fukushima, Eiichi; Mondy, Lisa Ann; Stephens, Thomas

doi:10.1122/1.550157

Cited by 261 publications

(155 citation statements)

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“…The techniques used in this experiment remained essentially the same as those described in Abbott et al (1991). The suspensions consisted of 50% by volume of polymethyl methacrylate (PMMA) particles suspended in a density-matched liquid.…”

Section: Experimental Methodsmentioning

confidence: 99%

Hydrodynamic particle migration in a concentrated suspension undergoing flow between rotating eccentric cylinders

Phan‐Thien¹,

Graham²,

Abbott³

et al. 1995

Ind. Eng. Chem. Res.

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We report on experimental measurements and numerical predictions of shear-induced migration of particles in concentrated suspensions subjected to flow in the wide gap between a rotating inner cylinder placed eccentrically within a fixed outer cylinder (a cylindrical bearing). The suspensions consists of large, noncolloidal spherical particles suspended in a viscous Newtonian liquid. Nuclear magnetic resonance (NMR) imaging is used to measure the time evolution of concentration and velocity profiles as the flow induces particle migration from the initial, well-mixed state.A model, originally proposed by Phillips et al. (1992) is generalized to two dimensions. The coupled equations of motion and particle migration are solved numerically using an explicit pseudo-transient finite volume formulation. While not all of the qualitative features observed in the experiments are reproduced by this general numerical implementation, the velocity predictions show moderately good agreement with the experimental data.

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Section: Experimental Methodsmentioning

confidence: 99%

Hydrodynamic particle migration in a concentrated suspension undergoing flow between rotating eccentric cylinders

Phan‐Thien¹,

Graham²,

Abbott³

et al. 1995

Ind. Eng. Chem. Res.

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“…Blood shows remarkable non-Newtonian effects primarily caused by RBC -RBC interactions and RBC -protein interactions: the aggregation and disaggregation of RBCs and their deformation dictate the value of viscosity [1,2]. A wide body of experimental evidence shows that flowing suspensions of rigid and deformable particles exhibit particle migration [3][4][5][6][7][8][9][10] with a general trend showing migration from regions of higher shear rate to regions of lower shear rate. RBCs also show this behaviour and their migration to the centre of micro and small vessels (micrometre to millimetre size) and the consequent segregation of PLTs near the wall has been the subject of intense study in the past years, both numerically [11][12][13][14] and experimentally [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Synergy between shear-induced migration and secondary flows on red blood cells transport in arteries: considerations on oxygen transport

Biasetti

Spazzini

Hedin

et al. 2014

J. R. Soc. Interface.

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Shear-induced migration of red blood cells (RBCs) is a well-known phenomenon characterizing blood flow in the small vessels (micrometre to millimetre size) of the cardiovascular system. In large vessels, like the abdominal aorta and the carotid artery (millimetre to centimetre size), the extent of this migration and its interaction with secondary flows has not been fully elucidated. RBC migration exerts its influence primarily on platelet concentration, oxygen transport and oxygen availability at the luminal surface, which could influence vessel wall disease processes in and adjacent to the intima. Phillips' shear-induced particle migration model, coupled to the Quemada viscosity model, was employed to simulate the macroscopic behaviour of RBCs in four patient-specific geometries: a normal abdominal aorta, an abdominal aortic aneurysm (AAA), a normal carotid bifurcation and a stenotic carotid bifurcation. Simulations show a migration of RBCs from the near-wall region with a lowering of wall haematocrit (volume fraction of RBCs) on the posterior side of the normal aorta and on the lateralexternal side of the iliac arteries. A marked migration is observed on the outer wall of the carotid sinus, along the common carotid artery and in the carotid stenosis. No significant migration is observed in the AAA. The spatial and temporal patterns of wall haematocrit are correlated with the near-wall shear layer and with the secondary flows induced by the vessel curvature. In particular, secondary flows accentuate the initial lowering in RBC near-wall concentration by convecting RBCs from the inner curvature side to the outer curvature side. The results reinforce data in literature showing a decrease in oxygen partial pressure on the inner curvature wall of the carotid sinus induced by the presence of secondary flows. The lowering of wall haematocrit is postulated to induce a decrease in oxygen availability at the luminal surface through a diminished concentration of oxyhaemoglobin, hence contributing, with the reported lowered oxygen partial pressure, to local hypoxia.

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“…Chow et al 4) also employed this technique to measure the concentration profiles of neutrally buoyant suspensions of nearly monodisperse, non-Brownian spherical particles. Abbott et al 2) found that the particles migrated away from the inner cylinder and toward the outer wall where shear rate was lower using NMRI. The NMRI data confirmed the Leighton and Acrivos shear-induced migration theory and constitutive equations.…”

Section: Introductionmentioning

confidence: 99%

“…There had been growing interests on the microstructure, hydrodynamic interaction and concentration distribution of particles in concentrated suspension ever since the pioneering experimental works of Leighton and Acrivos 1) , Abbott et al 2) , and Phillips et al 3) They pointed out that in addition to…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Shear-Induced Particle Migration in Steady-State Isothermic Extrusion

Tan

Chen

Lam

et al. 2003

J. Soc. Rheol., Jpn

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Experimental evidence for radial particle migration in a pressure driven tube flow of a non-Newtonian viscous concentrated suspension will be presented. The suspension is a well-characterized, mono-modal nickel spherical particles having 30% volume fraction. The particles experienced a drift particle concentration profile as a function of the radial position. SEM technique was used to capture micrographs of the sample at various sections in the axial flow direction with a specially designed capillary split die. With the help of image analytical software, the distribution of particle concentration as a function of radial position was obtained. Finally, comparisons were made between experimental results and numerical predictions based on a continuum diffusive-flux model for shear-induced particle migration. Good agreement between experimental observations and numerical predictions indicated that the procedures were useful in capturing particle migration in steady-state isothermic extrusion flow which exhibits a near plug-like concentration profile.

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Experimental observations of particle migration in concentrated suspensions: Couette flow

Cited by 261 publications

References 0 publications

Hydrodynamic particle migration in a concentrated suspension undergoing flow between rotating eccentric cylinders

Hydrodynamic particle migration in a concentrated suspension undergoing flow between rotating eccentric cylinders

Synergy between shear-induced migration and secondary flows on red blood cells transport in arteries: considerations on oxygen transport

Experimental Investigation of Shear-Induced Particle Migration in Steady-State Isothermic Extrusion

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