Modelling of water droplet dynamics on hydrophobic soils: a review

The hydrophobicity of soils (or soil water repellency) can be naturally promoted by wildfires or synthetically induced by hydrophobic compounds (polydimethylsiloxane, tong oil, etc.). Soil phenomena can be related to hydrophobicity, such as soil erosion (splash erosion and rill erosion) and post-wil...

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Bibliographic Details
Main Authors: Zhang, Shuaihao, Hu, Xiangyu, Lourenço, Sérgio D. N.
Format: Conference Proceeding
Language:English
Subjects:
Contact angle
Droplets
Granular materials
Hydraulic properties
Hydrodynamics
Hydrophobicity
Mathematical models
Moisture content
Numerical analysis
Numerical methods
Polydimethylsiloxane
Repellency
Rill erosion
Smooth particle hydrodynamics
Soil dynamics
Soil erosion
Soil water
Water drops
Water repellent soils
Wildfires
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Summary:The hydrophobicity of soils (or soil water repellency) can be naturally promoted by wildfires or synthetically induced by hydrophobic compounds (polydimethylsiloxane, tong oil, etc.). Soil phenomena can be related to hydrophobicity, such as soil erosion (splash erosion and rill erosion) and post-wildfire debris flows. The hydrophobicity of soils is characterized by the contact angle, and the interactions between water droplet and solid particles including spreading, oscillation, and infiltration. Early studies on soil water repellency mainly focus on the experimental aspects, while with the development of advanced numerical tools, numerical methods have been widely applied to study the hydraulic properties of hydrophobic granular materials in recent years. This paper comprehensively investigates the different numerical methods for modelling the interaction between water droplets and hydrophobic soils, i.e., smoothed particle hydrodynamics (SPH), lattice Boltzmann method (LBM), material point method (MPM), and volume of fluid (VOF). The features of different method are summarized, and the future work are discussed.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202338218005