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Extensional flow of blood analog solutions in microfluidic devices
Biomicrofluidics
|April 13, 2011
Summary
Choosing blood analog fluids requires considering extensional rheology, not just shear rheology. Elastic properties significantly impact microcirculatory flow patterns, influencing the accuracy of in vitro models.
Area of Science:
- Fluid Mechanics
- Biomaterials Science
- Rheology
Background:
- Accurate in vitro mimicking of the microcirculatory system requires careful selection of blood analog fluids.
- Both shear and extensional rheological properties are crucial for realistic simulations.
Purpose of the Study:
- To investigate the importance of extensional rheology in selecting blood analog solutions.
- To compare the flow behavior of Newtonian and viscoelastic fluids in microfluidic contractions and expansions.
Main Methods:
- Characterization of polyacrylamide and xanthan gum solutions using rotational and capillary breakup extensional rheometry (CaBER).
- Experimental analysis of flow patterns, velocity fields, and pressure drops in microfluidic channels.
- Comparison with numerical simulations of Newtonian and shear-thinning fluids.
Main Results:
- Viscoelastic blood analogs showed distinct flow patterns despite similar shear-thinning behavior.
- Fluid elasticity, particularly in polyacrylamide solutions, significantly altered flow characteristics.
- Extensional rheology, specifically relaxation times, differed by an order of magnitude between analogs.
Conclusions:
- Extensional rheology is critical for selecting appropriate blood analogs for microcirculation studies.
- Elastic properties of analog fluids must be considered for accurate in vitro replication of blood flow at the microscale.
