To investigate the effects of additives such as 2- EH, 1 - Octanol, on the ammonia bubble absorption, surface tensions of aqueous ammonia with additives were measured by a drop weight method, and performances of absorption of ammonia vapor from an orifice into water were recorded by a video camera and analyzed. In the case with additives, the surface tension decreased significantly. For a given additive ooncentration, the surface tension of aqueous ammonia increased with the increase of the ammonia when the concentration was less than 10%. However, the surface tension decreased when the concentration was more than 10%. During the bubble absorption process, the ammonia vapor flow rate had little effect on the bubble generative frequency, however, the maximum bubble volume, the maximum absorption height, and the Sherwood number for a single bubble increased whenthe flow rate of ammonia vapor increased. For a single absorption cycling, the additives ：2- EH and 1 - Octanol with a suitable concentration range might enhance the heat and mass transfer.
Journal of Refrigeration