A mathematic model of gas-liquid flow in the dual-contact-flow absorption tower is established and some valuable theoretical and numerical simulation results are also obtained. The numerical results show that the velocity and density of liquid droplets are spatially nonuniform and the maximum density of liquid droplets appears at the top of the liquid bed. Therefore the mass and heat transfer there are significantly intense. However, once the gas or liquid velocity is so high that the liquid droplets carried away from the absorption tower can not be neglected, the heat transfer quantity will drop sharply, thus there may generate the heat transfer deterioration. Although liquid droplets consist of broken droplets of different sizes, almost all the active droplets possess the same maximum jetting height. Moreover, in most cases the theoretical analysis and numerical simulation of the actual bed height agree well with the experimental results. Besides, the gas velocity can only lead to changing of the fallback characteristic, while it has little effect on the bed height. In addition, the limit diameter of droplets increases obviously with the gas velocity, while it has little relevance with liquid jetting velocity.
Experimental investigation of gas-liquid flow characteristics in slit rectangular and circular channels
