Speaker
Description
The transport of flexible fibers through complex environments, such as porous and structured media, occurs in a variety of systems such as textile microplastics in soils or fibers in small cracks of natural rocks. Additionally, particle sorting or separation using structured media, such as pillar arrays, is essential to many processes, such as diagnosis, biological analysis, and environmental assessment. However, due to their deformability and elongated shapes, fibers can exhibit complex trajectories and intricate dynamics in tortuous flows.
Here we combine model microfluidic experiments and numerical simulations to investigate the dynamics of flexible fibers in pillar arrays. We report a non-monotonic migration dynamics with fiber length, identifying a distinct "band-pass" sorting mechanism. We investigate the effect of geometrical parameters (porosity, incident flow angle) and mechanical parameters (fiber deformability) on this band pass effect. We define an operational domain in which this band-pass effect occurs, and identify the conditions for optimal separation. Our findings not only help in the design of efficient separation and filtration technologies, but also shed light on the dynamics of deformable objects in tortuous environments.
| Country | France |
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