Rheological Properties of Sheared Vesicle and Cell Suspensions

Lamura, A.; Gompper, Gerhard

doi:10.1016/j.piutam.2015.03.002

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…The values η I of the intrinsic viscosity, time-averaged in the steady state, are reported in Figure 2 as a function of λ. It appears that η I is an increasing function of λ for the used values of the reduced area, bending energy, and temperature, in agreement with our previous results [26,39]. In the Keller-Skalak theory [5], where thermal fluctuations are ignored, the sharp TT-to-TU transition occurs at λ c 3.7 for S * = 0.80 and at λ c 6.5 for S * = 0.95.…”

Section: Resultssupporting

confidence: 90%

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Numerical Study of a Confined Vesicle in Shear Flow at Finite Temperature

Lamura¹

2022

Mathematics

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The dynamics and rheology of a vesicle confined in a channel under shear flow are studied at finite temperature. The effect of finite temperature on vesicle motion and system viscosity is investigated. A two-dimensional numerical model, which includes thermal fluctuations and is based on a combination of molecular dynamics and mesoscopic hydrodynamics, is used to perform a detailed analysis in a wide range of the Peclet numbers (the ratio of the shear rate to the rotational diffusion coefficient). The suspension viscosity is found to be a monotonous increasing function of the viscosity contrast (the ratio of the viscosity of the encapsulated fluid to that of the surrounding fluid) both in the tank-treading and the tumbling regime due to the interplay of different temperature-depending mechanisms. Thermal effects induce shape and inclination fluctuations of the vesicle which also experiences Brownian diffusion across the channel increasing the viscosity. These effects reduce when increasing the Peclet number.

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Section: Resultssupporting

confidence: 90%

“…In order to describe the coupling of solvent particles with the vesicle, each bead is treated as a "rough" hard disk having radius r v [26,38,39]. The value of r v is set so that disks overlap obtaining a full covering up of the membrane.…”

Section: The Modelmentioning

confidence: 99%

Numerical Study of a Confined Vesicle in Shear Flow at Finite Temperature

Lamura¹

2022

Mathematics

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“…The increase in computational power combined with the development of many numerical techniques has opened the way towards numerical studies of blood flow properties by allowing us to account for several hundreds or thousands of cells at a time. Many studies have been devoted to the rheology of dilute suspensions of vesicles or capsules (another model of elastic shells mimicking RBCs), theoretically [10][11][12], numerically [13][14][15][16][17][18][19], and experimentally [20,21]. More recently, several simulations have been devoted to the study of more concentrated suspensions [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Shear thinning and shear thickening of a confined suspension of vesicles

et al. 2018

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Widely regarded as an interesting model system for studying flow properties of blood, vesicles are closed membranes of phospholipids that mimic the cytoplasmic membranes of red blood cells. In this study we analyze the rheology of a suspension of vesicles in a confined geometry: the suspension, bound by two planar rigid walls on each side, is subject to a shear flow. Flow properties are then analyzed as a function of shear rate γ[over ̇], the concentration of the suspension ϕ, and the viscosity contrast λ=η_{in}/η_{out}, where η_{in} and η_{out} are the fluid viscosities of the inner and outer fluids, respectively. We find that the apparent (or effective viscosity) of the suspension exhibits both shear thinning (decreasing viscosity with shear rate) or shear thickening (increasing viscosity with shear rate) in the same concentration range. The shear thinning or thickening behaviors appear as subtle phenomena, dependant on viscosity contrast λ. We provide physical arguments on the origins of these behaviors.

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Long-range hydrodynamic effect due to a single vesicle in linear flow

Afik

Lamura

Steinberg

2016

EPL

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Vesicles are involved in a vast variety of transport processes in living organisms. Additionally, they serve as a model for the dynamics of cell suspensions. Predicting the rheological properties of their suspensions is still an open question, as even the interaction of pairs is yet to be fully understood. Here we analyse the effect of a single vesicle, undergoing tank-treading motion, on its surrounding shear flow by studying the induced disturbance field δ V , the difference between the velocity field in its presence and absence. The comparison between experiments and numerical simulations reveals an impressive agreement. Tracking ridges in the disturbance field magnitude landscape, we identify the principal directions along which the velocity difference field is analysed in the vesicle vicinity. The disturbance magnitude is found to be significant up to about 4 vesicles radii and can be described by a power law decay with the distance d from the vesicle δ V ∝ d −3/2 . This is consistent with previous experimental results on the separation distance between two interacting vesicles under similar conditions, for which their dynamics is altered. This is an indication of vesicles long-range effect via the disturbance field and calls for the proper incorporation of long-range hydrodynamic interactions when attempting to derive rheological properties of vesicle suspensions.

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Rheological Properties of Sheared Vesicle and Cell Suspensions

Cited by 3 publications

References 38 publications

Numerical Study of a Confined Vesicle in Shear Flow at Finite Temperature

Numerical Study of a Confined Vesicle in Shear Flow at Finite Temperature

Shear thinning and shear thickening of a confined suspension of vesicles

Long-range hydrodynamic effect due to a single vesicle in linear flow

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