In a typical NH3/H2O bubble absorption process, aqueous ammonia solution is used as the absorbent and ammonia vapor as the refrigerant. The refrigerant vapor from the evaporator in absorption refrigeration system at a pressure of P comes into the absorbent in the absorber at initial temperature and concentration of T0 and X0, respectively. The spherical bubble shown in Fig. 1, is formed on the top of the nozzle of the absorber, and grows up gradually. Because the saturated vapor pressure of the absorbent is lower than P, the absorbent absorbs the refrigerant vapor with the bubble growing up. If the interfacial mass transfer resistance is neglected, it can be assumed that the bubble interface is in an equilibrium condition, which corresponds the equilibrium concentration of refrigerant, i.e., Xi. Due to the concentration difference, Xi − X0, the ammonia molecules move from the interface toward the bulk of the absorbent. At one time, the vapor absorbed by the absorbent releases latent heat, which directly increases the interface's temperature, Ti. Due to the temperature difference, Ti− T0, the heat moves into the bulk of the absorbent and is transferred into cooling water. When the size of the bubble becomes larger than the critical volume, the bubble separates with the nozzle. The forming process of a bubble ends.