چكيده به لاتين
Activated carbon is one of the most widely used porous materials with a solid matrix consisting of millions of fine pores that produce a significant level of effectiveness. It is able to separate organic compounds, contaminants and other impurities from various environments. Depending on the required applications, the diameter of the activated carbon particle’s pores varies from 4 to 100,000 angstroms. The purpose of carbon activation is to reduce impurities in the primary carbon and oxidation of the surface. One of the most important parameters when using porous materials is the fluid pressure drop while passing through the porous material bed. It is necessary to know the pressure drop for design and construction of systems using porous materials. Therefore, this study will examine the various parameters affecting the amount of pressure drop. These parameters include the permeability of carbons, fluid inlet pressure, fluid flow rate, granular carbon particle size, gravitational acceleration and fluid type.
In addition to the factors mentioned above, gravity can also have a significant effect on the amount of fluid pressure drop. It is expected that, when this force is in the direction and in line with the fluid motion, the pressure drop is less than the force applied to the opposite direction of the fluid's movement. Due to the fact that no previous research has been studied on this subject, this study intends to specifically examine this important parameter. For this purpose, a test section system has been used for vertical testing. Research has been done for both in the direction and opposite direction of the fluid's movement.
The pressure drop is a fundamental parameter for calculating the permeability in porous media. Therefore, by calculating the pressure drop around these medias, the permeability can be calculated using existing relationships. The results of the experiments are presented as pressure drop in terms of flow rate diagrams and friction factor in terms of Reynolds number diagrams. In the results obtained from the experiments, it was observed that increasing the velocity in the bed increases the pressure drop. Also, the size of the tested particles influences the results, and the pressure drop decreases with smaller particle size.
