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Controlled Microfluidic Environment for Dynamic Investigation of Red Blood Cell Aggregation
Published on: June 4, 2015
Lift and down-gradient shear-induced diffusion in red blood cell suspensions
Xavier Grandchamp1, Gwennou Coupier, Aparna Srivastav
1Laboratoire Interdisciplinaire de Physique, CNRS - UMR 5588, Université Grenoble I, BP 87, 38402 Saint Martin d'Hères Cedex, France.
Physical Review Letters
|March 26, 2013
Summary
Red blood cell distribution near walls is complex. This study reveals significant lift forces and anisotropic diffusion in shear flow, explaining cell migration patterns.
Area of Science:
- Fluid dynamics
- Biophysics
- Cellular mechanics
Background:
- Red blood cell distribution in confined flows is inhomogeneous, with wall depletion.
- This phenomenon arises from competing forces: wall-avoidance migration and shear-induced diffusion.
- Understanding these dynamics is crucial for microfluidic applications and blood flow studies.
Purpose of the Study:
- To investigate the lift forces acting on red blood cells (RBCs) in shear flow near a wall.
- To quantify the collective and anisotropic shear-induced diffusion of RBCs.
- To characterize the subdiffusion behavior of RBCs in confined flows.
Main Methods:
- Experimental investigation of RBCs in shear flow near a wall.
- Measurement of lift velocity and cell tumbling motion.
- Quantification of shear-induced diffusion in different directions.
Main Results:
- Significant lift velocity of RBCs was measured, even with cell tumbling.
- Values for collective and anisotropic shear-induced diffusion were determined.
- A generic down-gradient subdiffusion with an exponent of 1/3 was observed.
Conclusions:
- RBCs experience significant lift forces in shear flow, influencing their distribution.
- Shear-induced diffusion is anisotropic and contributes to cell migration patterns.
- The observed subdiffusion provides insights into RBC dynamics in confined environments.
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