Particle migration of concentrated suspension flow in bifurcating channels

Medhi, Bhaskar Jyoti; Reddy, M. Mallikarjuna; Singh, Anugrah

doi:10.1016/j.apt.2019.06.009

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…The degree of bluntness increases as bulk volume fraction was observed by Koh et al [13]. The particle image velocimetry technique was used by Medhi et al [14] to study the flow of dense suspension and also reported blunted velocity profile in an experiment on the free surface. In another experiment on Couette flow, Abbott et al [15] suggested that the migration is independent of liquid viscosity in which particles are suspended and the rate of migration is proportional to the radius of the particle and shear rate.…”

Section: Introductionmentioning

confidence: 88%

“…3. From the contours it is evident that for a given bulk volume fraction there is a gradient in the local volume fraction as the suspension flows through the channel [14]. The local volume fraction is higher at the center and lower at the wall of the channel due to particle migration.…”

Section: Variation Of Volume Fractionmentioning

confidence: 99%

“…The particles migrate from higher to lower granular temperature regions, i.e., from the wall toward the center of the channel which leads to an increase in the local volume fraction at the center [29]. As the bulk volume fraction increases, the change in local volume fraction rises, which is evident from the profile as an increment in the gradient of the local volume fraction [14]. The profiles of all five bulk volume fractions show the same pattern with a maximum volume fraction at the center and a minimum at the walls.…”

Section: Variation Of Volume Fractionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Bulk Volume Fraction on Shear‐Induced Diffusion Using the Multi‐Fluid Volume‐of‐Fluid Model

2023

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Shear-induced migration is the diffusion of particles in a direction normal to the flow of suspension. The particles migrate towards the low-shear stress region from the higher-shear stress region. In the kinetic theory of granular flow, the driving potential for the migration of particles is the difference in granular temperature, defined as the kinetic energy of particle fluctuations. The effect of bulk volume fraction on the particle migration in a dense suspension flow through a rectangular microchannel is analyzed. The multiphase simulation was conducted using the multi-fluid volume-of-fluid and granular temperature model. The results show a blunted velocity profile, reduced peak velocity, and an increase in variation of local volume fraction with an increase in bulk volume fraction.

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Section: Introductionmentioning

confidence: 88%

Section: Variation Of Volume Fractionmentioning

confidence: 99%

Section: Variation Of Volume Fractionmentioning

confidence: 99%

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Influence of Bulk Volume Fraction on Shear‐Induced Diffusion Using the Multi‐Fluid Volume‐of‐Fluid Model

2023

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“…Non-uniform systems can also be the result of instabilities, due to underlying non-monotonic flow curves, leading to banding (147), or dynamic instabilities (20,96,99,136,148,149,150). Shear-induced migration is also important in non-uniform conditions (7,151,152,153). Remarkably, there is a growing body of evidence that these instabilities are coupled to macroscopic deformation of the free surface, when present (98,149,154,155).…”

Section: Fluid Mechanicsmentioning

confidence: 99%

The physics of dense suspensions

Ness,

Seto,

Mari

2021

Preprint

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Dense suspensions of particles are relevant to many applications and are a key platform for developing a fundamental physics of out-ofequilibrium systems. They present challenging flow properties, apparently turning from liquid to solid upon small changes in composition or, intriguingly, in the driving forces applied to them. The emergent physics close to the ubiquitous jamming transition (and to some extent the glass and gelation transitions) provides common principles with which to achieve a consistent interpretation of a vast set of phenomena reported in the literature. In light of this, we review the current state of understanding regarding the relation between the physics at the particle scale and the rheology at the macroscopic scale. We further show how this perspective opens new avenues for the development of continuum models for dense suspensions.

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Accurate modeling of blood flow in a micro-channel as a non-homogeneous mixture using continuum approach-based diffusive flux model

2023

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This paper presents a continuum approach for the blood flow simulation, inside the micro-channel of the few micrometers characteristics dimension, within the context of the finite volume method on unstructured grids. The velocity and pressure fields, for the blood flow, are obtained here by solving the Navier- Stokes equations. A particle transport equation, based on the diffusive flux model (DFM), provides the hematocrit distribution (i.e., the red blood cells volume-fraction). The momentum equation is coupled with the particle transport equation through the constitutive blood viscosity model, and this blood viscosity is dependent on hematocrit and shear rate. The continuum approach for blood flow inside the micro-channel of the length scale of a few micrometers to a few hundred micrometers is expected to break down. Interestingly, the present approach provides meaningful insights into biophysics with less computational cost and shows a good match with the experiments and mesoscale simulation with a maximum average deviation of 11% even at the characteristic dimensions of 10-300 μm. A correlation is proposed for additional-local shear rate in terms of the hematocrit and the ratio of red blood cells diameter to the channel diameter, which helps us to demonstrate an increase in the accuracy and also eliminates the issues of unphysical hematocrit reported in the earlier studies available in the literature. The study is extended to provide new results inside a square and rectangular cross-section micro-channels, under a range of inlet parameters.

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Particle migration of concentrated suspension flow in bifurcating channels

Cited by 4 publications

References 28 publications

Influence of Bulk Volume Fraction on Shear‐Induced Diffusion Using the Multi‐Fluid Volume‐of‐Fluid Model

Influence of Bulk Volume Fraction on Shear‐Induced Diffusion Using the Multi‐Fluid Volume‐of‐Fluid Model

The physics of dense suspensions

Accurate modeling of blood flow in a micro-channel as a non-homogeneous mixture using continuum approach-based diffusive flux model

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