Capillary imbibition in open-cell monodisperse foams.
Olivier Pitois1, Asmaa Kaddami1, Vincent Langlois1
1Lab Navier, Univ Gustave Eiffel, ENPC, CNRS, F-77447 Marne-la-Vallée, France.
Journal of Colloid and Interface Science
|March 22, 2020
Summary
Capillary imbibition in solid foams is slower than predicted by theory. This study quantizes the deviation, offering insights into liquid-gas interface dynamics in porous materials for better predictions.
Area of Science:
- Materials Science
- Fluid Dynamics
- Porous Media Physics
Background:
- Capillary imbibition is crucial in industrial applications.
- Existing theories for capillary imbibition have not been validated for solid foams.
Purpose of the Study:
- To investigate the applicability of general capillary imbibition theory to solid foams.
- To quantify the imbibition rate in solid foams and compare it with theoretical predictions.
Main Methods:
- Producing solid foam samples with controlled pore size and volume fraction.
- Measuring permeability, capillary pressure, and imbibition rates.
- Comparing experimental data with the Washburn theory.
Main Results:
- Imbibition velocity showed qualitative agreement with Washburn theory.
- Experimental imbibition velocity was one order of magnitude lower than predicted.
- A deviation attributed to liquid-gas interface dynamics in pore connections was identified.
Conclusions:
- The study provides the first quantitative understanding of imbibition in solid foams.
- An empirical expression for interface dynamics was developed.
- Findings aid in predicting imbibition rates for diverse foamed materials.
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