Magnetic and absolute permeability

Magnetic permeability is the connection between magnetic flux (B) and magnetic field intensity (H). Apart from ferrous metals, which have a high permeability and various metals, which have much lower magnetic permeability, however, it is greater than unity.

The magnetic permeability of most materials is unity, such as insulating materials such as glass and plastic. Within permeability there are several types of permeability, but today we will delve into absolute permeability. Absolute permeability is the ability of a rock to provide fluid flow through holes connected to each other. This type of permeability is totally saturated because of a fluid.

Absolute permeability is called the degree of magnetization found in a material as a reaction to a magnetic field. This permeability can be symbolized as µ.

To obtain this degree we can use two formulas:

µ = B / H

 - B = The magnetic field intensity

 - H = It is the magnetic exaltation

µ = µr µ0

 - µr = relative magnetic permeability

 - µ0 = magnetic permeability of the vacuum

Absolute permeability is calculated when the flow completely saturates the porous media. The permeability coefficient is directly linked to Darcy's Law which refers to the flow of fluids through soils. As we have said previously, this coefficient is represented by the letter k. Darcy's law allows us to specify the behavior of a fluid through a porous medium.

The lower the absolute permeability, the greater the relative permeability curvature of the non-wetting phase, this phase has a lower relative permeability.

There are several ways to measure the coefficient of permeability:

- It is measured in a laboratory we can find the constant load and variable load permeameter.

- Can be measured on site

- It can be measured empirically, either Allen-Hazen, Loudon, Terzagui, Schilichter, horizontal capillary test

To measure absolute permeability, a permeameter is required, which is the instrument we need to measure it.

Next, we can see a permeameter:

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