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Spontaneous localized fluid release on swelling fibres
Pierre Van de Velde1, Julien Dervaux2, Suzie Protière3
1LadHyX, Ecole Polytechnique, UMR 7646, Palaiseau, France.
Soft Matter
|June 9, 2022
Summary
Fiber swelling from solvent absorption can cause unexpected fluid release. This study reveals how drop placement and volume trigger localized deswelling in fibers, with implications for material science.
Area of Science:
- Materials Science
- Fluid Dynamics
- Biophysics
Background:
- Fibers like vegetable, wood, and animal fibers absorb solvents, leading to swelling.
- Solvent absorption in fibers involves local swelling followed by diffusion.
Purpose of the Study:
- To investigate the dynamics of solvent absorption from multiple drops on a fixed-length fiber.
- To understand the swelling-induced global tension changes and subsequent fluid release (deswelling) in fibers.
Main Methods:
- Experimental observation of solvent absorption dynamics.
- Numerical modeling using a linear poroelastic model.
- Phase diagram construction based on drop volume and distance.
Main Results:
- Fiber absorption induces global tension changes.
- Closely spaced drops can cause localized fluid release (deswelling) in previously saturated regions.
- Conditions for deswelling were identified experimentally and numerically.
Conclusions:
- Fiber deswelling is a swelling-induced phenomenon dependent on drop configuration.
- The study provides a phase diagram for predicting deswelling in various fiber-solvent systems.
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