Hydrodynamic lift of vesicles under shear flow in microgravity

Callens, Natacha; Minetti, Christophe; Coupier, Gwennou; Mader, Maud-Alix; Dubois, Frank; Misbah, Chaouqi; Podgorski, Thomas

doi:10.1209/0295-5075/83/24002

Cited by 78 publications

(61 citation statements)

References 26 publications

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“…When they are sheared close to a wall, a lift force of viscous origin appears which pushes vesicles away from the wall. This lift force is a consequence of the fore-aft asymmetry of the flow between the deformable vesicle and the wall : the pressure distribution due to the contraction and expansion of the flow is asymmetric (contrary to what would happen with a rigid sphere near a wall) and results in a net force (Olla 1997;Cantat and Misbah 1999;Callens et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Vesicle Suspensions in Shear Flow Between Walls

Podgorski

Callens

Minetti

et al. 2010

Microgravity Sci. Technol.

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International audienceThe behaviour of a vesicle suspension in a simple shear flow between plates (Couette flow) was investigated experimentally in parabolic flight and sounding rocket experiments by Digital Holographic Microscopy. The lift force which pushes deformable vesicles away from walls was quantitatively investigated and is found to be rather well described by a theoretical model by Olla (J Phys II (France) 7:1533, 1997). At longer shearing times, vesicles reach a steady distrib- ution about the center plane of the shear flow chamber, through a balance between the lift force and shear induced diffusion due to hydrodynamic interactions between vesicles. This steady distribution was inves- tigated in the BIOMICS experiment in the MASER 11 sounding rocket. The results allow an estimation of self-diffusion coefficients in vesicle suspensions and reveal possible segregation phenomena in polydisperse suspensions

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Section: Introductionmentioning

confidence: 99%

Dynamics of Vesicle Suspensions in Shear Flow Between Walls

Podgorski

Callens

Minetti

et al. 2010

Microgravity Sci. Technol.

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“…[22][23][24][25] In agreement with the numerical and theoretical studies for simple shear flows, 22,24 we showed recently that the migration velocity decreases like 1 / y 2 , where y is the distance to the wall of the center of mass of the vesicle. 26 ͑ii͒ The nonconstant shear rate in a parabolic velocity profile ͑even unbounded͒ leads to a subtle interplay between the gradient of shear and the shape, 27 resulting in migration toward the center with a constant drift velocity except near the centerline. In a realistic channel, both effects coexist and we shall see that this leads to a new and nontrivial noninertial migration law.…”

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confidence: 99%

Noninertial lateral migration of vesicles in bounded Poiseuille flow

et al. 2008

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“…Due to the lift force from a wall [25][26][27] and the migration in a parabolic Poiseuille flow [28,29], vesicles are aligned close to the center of the channel. In the glucose solutions, the buoyancy force leads to a displacement of the vesicles from the center of the channel in the z-direction (see Fig.…”

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confidence: 99%

Dynamics of fluid vesicles in flow through structured microchannels

et al. 2010

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Abstract. -The dynamics of fluid vesicles is studied under flow in microchannels, in which the width varies periodically along the channel. Three types of flow instabilities of prolate vesicles are found. For small quasi-spherical vesicles -compared to the average channel width -perturbation theory predicts a transition from a state with orientational oscillations of a fixed prolate shape to a state with shape oscillations of symmetrical ellipsoidal or bullet-like shapes with increasing flow velocity. Experimentally, such orientational oscillations are observed during the slow migration of a vesicle towards the centerline of the channel. For larger vesicles, mesoscale hydrodynamics simulations and experiments show similar symmetric shape oscillation at reduced volumes V * 0.9. However, for non-spherical vesicles with V * 0.9, shapes are found with two symmetric or a single asymmetric tail.Introduction. -Soft deformable objects such as liquid droplets, vesicles, and cells show a complex behavior under flow. For example, in simple shear flow, fluid vesicles exhibit tank-treading, tumbling, and swinging (also called vacillating-breathing, or trembling) motions, depending on parameters such as shear rate, viscosity contrast, and internal volume [1][2][3][4][5][6][7][8][9]. Understanding the flow behavior of lipid vesicles and red blood cells (RBCs) is not only an interesting problem of the hydrodynamics of deformable, thermally fluctuating membranes, but is also important for medical applications. In microcirculation, the deformation of RBCs reduces the flow resistance of microvessels. In diseases such as sickle cell anemia, RBCs have reduced deformability and often block microvascular flow [10]. Lipid vesicles are considered as a simple model of RBCs and also have applications as drug-delivery systems.The recent development of microfluidic techniques [11] allows the investigation and manipulation of individual

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Hydrodynamic lift of vesicles under shear flow in microgravity

Cited by 78 publications

References 26 publications

Dynamics of Vesicle Suspensions in Shear Flow Between Walls

Dynamics of Vesicle Suspensions in Shear Flow Between Walls

Noninertial lateral migration of vesicles in bounded Poiseuille flow

Dynamics of fluid vesicles in flow through structured microchannels

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