Geometrical Effects on Spray Performance of a Special Twin-fluid Atomizer without Water Power and its CO₂ Absorption Capacity

Abstract

The multi-fluids mixer patented by Sadatomi & Kawahara (2012) can be utilized as a twin-fluid atomizer, in which liquid atomization is implemented by supplying compressed gas into a mixing chamber, and water is sucked automatically due to a vacuum pressure induced by an orifice. A series of experiments were conducted to study the effects of the geometries (i.e., size of atomizer, orifice shape) on spray performance. From a comparative analysis of the experiments, the effects of the geometrical parameters on spray characteristics, such as mist generation rate, atomization efficiency, Sauter mean diameter of atomized water droplets, etc., were clarified. Finally, the CO₂ elimination capacity of the mist sprayed by the atomizer with the optimum specification was tested in a closed room with different spray time and different methods. The results showed that, the maximum capacity of CO₂ elimination was obtained by spraying mist for 5 minutes with a PET propeller, and the CO₂ concentration could be reduced from 1000 ppm to 800 ppm.