Biological treatment of exhausted gas is one of study hotspots on purification of industrial exhausted gas in the world. Previous experiments have proved that the process of biological treatment in trickling biofilter is principally limited by the mass transfer resistance in liquid-phase. The two-phase flow characteristics has significant influences on the purification efficiency in the packed-bed of the trickling biofilter. Therefore, it is very important to study the two-phase flow behaviors in the packed-bed. In this paper, a visualization experiment was conducted for two-phase flow of air and water in a regular porous structure. The effects of liquid flow rate and gas flow rate on the two-phase flow friction were studied, respectively. The experimental results show that with the increase in the air flow rate, the flow friction factor increases at a fixed water flow rate. For a fixed air flow rate, the two-phase flow friction factor increases as the water flow rate increasing and a larger air flow rate leads to a larger variation of the flow friction factor with the water flow rate. For predicting the two-phase flow friction characteristics of the porous structure, a correlation of flow friction factor was obtained from the experimental data by using Reynolds number, Weber number, Bond number, and the dimensionless flow parameter.
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