Lattice Boltzmann Modeling of Drying of Porous Media Considering Contact Angle Hysteresis
Journal Article
·
· Transport in Porous Media
- Swiss Federal Institute of Technology, Zurich (Switzerland). Dept. of Mechanical and Process Engineering
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Sherbrooke, QC (Canada). Dept. of Civil and Building Engineering
Drying of porous media is governed by a combination of evaporation and movement of the liquid phase within the porous structure. Contact angle hysteresis induced by surface roughness is shown to influence multi-phase flows, such as contact line motion of droplet, phase distribution during drainage and coffee ring formed after droplet drying in constant contact radius mode. However, the influence of contact angle hysteresis on liquid drying in porous media is still an unanswered question. Lattice Boltzmann model (LBM) is an advanced numerical approach increasingly used to study phase change problems including drying. In this paper, based on a geometric formulation scheme to prescribe contact angle, we implement a contact angle hysteresis model within the framework of a two-phase pseudopotential LBM. The capability and accuracy of prescribing and automatically measuring contact angles over a large range are tested and validated by simulating droplets sitting on flat and curved surfaces. Afterward, the proposed contact angle hysteresis model is validated by modeling droplet drying on flat and curved surfaces. Then, drying of two connected capillary tubes is studied, considering the influence of different contact angle hysteresis ranges on drying dynamics. Finally, the model is applied to study drying of a dual-porosity porous medium, where phase distribution and drying rate are compared with and without contact angle hysteresis. The proposed model is shown to be capable of dealing with different contact angle hysteresis ranges accurately and of capturing the physical mechanisms during drying in different porous media including flat and curved geometries.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- ETH Zurich; Swiss National Science Foundation; USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1811890
- Report Number(s):
- LA-UR--21-21975
- Journal Information:
- Transport in Porous Media, Journal Name: Transport in Porous Media Journal Issue: 1 Vol. 140; ISSN 0169-3913
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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