Characterizing the basic geometric scalars of porous media
Pore ​​A material, or more or less empty voids in a system, where a particularly large void is called a cavern, a particularly finely defined molecular void, and a gap between the two is called a void.
It can be seen that the so-called pore is a qualitative concept. The pores in a porous medium may not be in communication with each other, but it is certain that at least some of the pores are in communication, and the connected portions are generally tortuous rather than linear.
Porosity (e) The ratio of the volume of the pore to the total volume of the system, ie
e= 
(1)
Effective porosity (e- effect ) The ratio of the interconnected pore volume in the system to the total volume of the system, ie
e effect = (2)
Specific internal surface area (S table ) The ratio of the surface area to the external surface area of ​​the system.
The pore size of the pore (d hole ) is artificial, not real, numerically
d hole = = (3)
Distortion (T- curve ) The ratio of the actual flow length of a fluid to the linear distance from the inflow to the outflow. It is a dimensionless scalar.
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