Where were we?. The physical properties of porous media The three phases Basic parameter set (porosity, density) Where are we going today? Hydrostatics in porous media!. Hydrostatics in Porous Media. Where we are going with hydrostatics Source of liquid-solid attraction
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Where we are going with hydrostatics
Source of liquid-solid attraction
Pressure (negative; positive; units)
Thermodynamic description of interfaces
Pressure-Water Content relationships
1.Water is attracted to the negative surface charge of mineral surfaces (Van der Waals attraction).
2.The periodic structure of the clay surfaces gives rise to an electrostatic dipole which results in an attractive force to the water dipole.
3.Osmotic force, caused by ionic concentration near charged surfaces, hold water.
4.Surface tension at water/air interfaces maintains macroscopic units of water in pore spaces.
Looking at an infinitesimal patch of
a curved fluid/fluid interface