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Foam drainage placed on a porous substrate
journal contribution
posted on 2015-11-05, 10:22 authored by Omid Arjmandi-Tash, Nina Kovalchuk, Anna TrybalaAnna Trybala, Victor StarovA model for drainage/imbibition of a foam placed on the top of a porous substrate is presented. The
equation of liquid imbibition into the porous substrate is coupled with a foam drainage equation at the
foam/porous substrate interface. The deduced dimensionless equations are solved using a finite element
method. It was found that the kinetics of foam drainage/imbibition depends on three dimensionless
numbers and the initial liquid volume fraction. The result shows that there are three different regimes of
the process. Each regime starts after initial rapid decrease of a liquid volume fraction at the foam/porous
substrate interface: (i) rapid imbibition: the liquid volume fraction inside the foam at the foam/porous
substrate interface remains constant close to a final liquid volume fraction; (ii) intermediate imbibition:
the liquid volume fraction at the interface with the porous substrate experiences a peak point and
imbibition into the porous substrate is slower as compared with the drainage; (iii) slow imbibition: the
liquid volume fraction at the foam/porous substrate interface increases to a maximum limiting value and
a free liquid layer is formed between the foam and the porous substrate. However, the free liquid layer
disappears after some time. The transition points between these three different drainage/imbibition
regimes were delineated by introducing two dimensionless numbers.
Funding
This research was supported by EU CoWet project; Procter & Gamble, USA; EPSRC, UK; PASTA project, European Space Agency; and COST project MP1106.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Published in
SOFT MATTERVolume
11Issue
18Pages
3643 - 3652 (10)Citation
ARJMANDI-TASH, O. ... et al., 2015. Foam drainage placed on a porous substrate. Soft Matter, 11 (18), pp. 3643 - 3652.Publisher
© The Royal Society of ChemistryVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
Closed accessISSN
1744-683XPublisher version
Language
- en