Tristability in Viscoelastic Flow Past Side-by-Side Microcylinders
Cameron C Hopkins1, Simon J Haward1, Amy Q Shen1
1Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa 904-0495, Japan.
Physical Review Letters
|February 19, 2021
Summary
Viscoelastic flow past microcylinders shows complex path selection. Changing the gap between cylinders reveals bistability and tristability, offering new insights into microfluidic behavior.
Area of Science:
- Fluid Dynamics
- Microfluidics
- Rheology
Background:
- Viscoelastic flows in microscale porous arrays display intricate path selection behaviors.
- Limited research connects single object flow dynamics to large-scale array behavior.
Purpose of the Study:
- Investigate viscoelastic flow path selection around side-by-side microcylinders with a variable gap.
- Characterize the influence of flow rate and intercylinder gap on flow behavior.
Main Methods:
- Experimental study of viscoelastic flow past microcylinders.
- Systematic variation of flow rate and intercylinder gap.
- Observation and analysis of flow path selection phenomena.
Main Results:
- Observed a sequence of two imperfect symmetry-breaking bifurcations with increasing flow rate.
- Identified selection of one or two of three possible flow paths.
- Tuning the gap revealed regions of bistability and tristability.
Conclusions:
- The study elucidates complex flow path selection in viscoelastic microflows.
- A dimensionless phase diagram highlights bistability and tristability regions.
- Findings advance understanding of microfluidic behavior in porous media.
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