*2.2.2 Foam in porous media*

*Analytical Chemistry - Advancement, Perspectives and Applications*

as the air/liquid interface enlarge the surface equilibrium changes, this leads to form

According to the structure, a foam may be distinguished in two main types [2, 3]:

In polyhedral gas cells thin flat "walls" are produced on ageing with connection

The bulk foam is an "agglomeration of gas bubbles parted from One another by thin liquid films. In bulk foam the total volume of gas (discontinues phase) is

We can say it as a provisional dilute dispersion of bubbles in the liquid. It involves of gas bubbles separated by thick films of viscous liquid formed in recently

polyhedral structure as shown in **Figure 2**.

*Foam stabilisation and formation of polyhedral structure foam.*

*A schematic of three bubbles meeting at a plateau border.*

**2. Types of foam**

**Figure 1.**

**Figure 2.**

**2.1 Spherical foam**

prepared systems.

*2.2.1 Bulk foam*

**2.2 Polyhedral gas cells**

points at plateau borders [2].

Mainly, the spume can be categorised as:

**140**

In porous media foam occurs as a distinct micro gas bubbles which is contact along the wetting fluid of aperture walls. Thin liquid films (lamella) make the bridge between these micro gas bubbles in order to separate them. In permeable media, the behaviour of spume and bubble size reliant on pore throat and pore size distribution. Mostly foam spread as bubble train in matrix of reservoir rock. In many cases, specific foam bubbles in reservoir matrix rock may be numerous pore bodies in length. Foam bubbles are mostly larger than pore bodies in porous media. As Foam present in the form of bubble trains in reservoir-rock porous media where the Plateau border of the foam lamellae is made at the pore wall and has, for stationary non flowing foam in the pore body, an angle of about 90° in the middle of the liquid lamellae and the pore wall [4–6].

Foam may also have classified as:

