In this paper

heat and mass transfer during the process of ammonia vapor absorbed into the surface of stagnant ammonia-water solution under the condition of large pressure difference was studied. Physical and mathematical models of the absorption process with coupled heat and mass transfer were established. The temperature field

concentration field and the dimensionless number which represents the mass transfer at the interface were developed with constant ammonia vapor pressure. The results indicate that the concentration and temperature at the interface are fixed values which only depend on the initial conditions. By introducing the ammonia-water gas-liquid phase equilibrium equation

the semi-empirical correlation containing criterion number

initial pressure differential and initial parameters of ammonia-water solution was developed. The variation curve between time-averaged mass transfer and the absorption time was obtained. The curve shows that the time-averaged mass transfer is the largest at the beginning of the absorption and drops rapidly as the absorption time increasing.