Liquid Atomization Experiment on Pulse Combustion Spray Drying

Based on the discussing of atomizing mechanism, liquid atomization experiments were carried out in the tailpipe of a Helmholtz-type pulse combustor. An optical analyzer was used for measuring the mean diameters of atomized droplets and their distribution. The effects of liquid viscosity on atomized droplet size and size distribution were investigated and analyzed. The results indicated that the droplet-size distribution is approximately a normal distribution. The range of the droplets' Sauter mean diameter is between 53 and 76 μm. The pulsating gas flow from the pulse combustor can be used to atomize liquid or slurry without a nozzle, and the atomizing effect can meet the spray drying requirements.