Experimental investigation of NH{sub}3-H{sub}2O bubble formation with absorption process

摘要

The objectives of the paper are to visualize the bubble shape and to investigate the characteristics of the bubble behavior for ammonia-water absorption process. The orifice diameter, liquid concentration and vapor velocity are considered as the key parameters. The initial bubble diameter increases with increasing the liquid concentration. A transition vapor Reynolds number is introduced, which is defined as Reynolds number at a sudden change of ratio of the initial bubble diameter to the orifice diameter. The transition Reynolds number increases with increasing the liquid concentration, and it significantly influences the bubble shape. Heat transfer additive (n-octanol) makes bubble more hemispherical. The departing bubbles tend to be spherical for a surface tension dominant flow, and the bubbles tend to be hemispherical for an inertial force dominant flow. This study presents an experimental correlation of initial bubble diameter with ±20 % error band. The correlation can be used to calculate the interfacial area in the design of ammonia-water bubble absorber.