Water rise in a cellulose foam: By capillary or diffusional flow?
Journal of the Mechanics and Physics of Solids
MetadataShow full item record
Mirzajanzadeh, M., Deshpande, V., & Fleck, N. (2019). Water rise in a cellulose foam: By capillary or diffusional flow?. Journal of the Mechanics and Physics of Solids, 124 206-219. https://doi.org/10.1016/j.jmps.2018.10.009
Critical experiments and predictive models reveal that water rise through a cellulose foam is initially by capillary rise, followed by non-linear diffusion in the presence of trapping sites. Classical ideas on capillary rise are supported by observations that the Washburn law is obeyed up to the Jurin height. However, water rise continues beyond the Jurin height, and this subsequent phase is diffusion-controlled according to the following evidence: the nature of the quantitative dependence of water rise upon time, the insensitivity of water rise to the direction of gravity, and the fact that the water front continues to rise in the foam after the water reservoir has been removed. Water diffusion occurs through the cellulose fibre network, along with trapping/de-trapping at molecular sites. The diffusion equations are solved numerically, and, upon comparing the predictions with the observed response, values are obtained for the diffusion constant and for the ratio of trap density to lattice density. The diffusion model explains why the drying of a damp foam is a slow process: the emptying of filled traps requires diffusion through an adjacent lattice of low water content.
Foams, Diffusion, Computed tomography
ERC H2020 GA-669764
European Commission Horizon 2020 (H2020) ERC (206409)
External DOI: https://doi.org/10.1016/j.jmps.2018.10.009
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285827
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: email@example.com