Numerical Modeling of the Organic Materials Micronizer and Prediction of the Characterizations of Particles Molten During the Micronization Process

The application of atmospheric spraying micronized powder device is a new method to dry and powder thermosensitive solutions. The inlet material could be pure ort with dispersed particles or a solution of different materials. In this research, stearic acid was used as the molten organic compound for producing powder, and calculations were performed to design a device with a production capacity of up to 500 kg/h and powder diameters of up to 300 µm. In order to better understanding the heat and momentum transfer phenomenon and powders freezing process inside the chamber, powder’s temperature, velocity, and phase profiles were calculated. Based on mathematical model results, the inlet cooling air temperature has a significant impact on powders diameter and increasing that temperature from 5 oC to 30 oC could duplicate the diameterof the produced powders. Chamber wall temperature is another important parameter and usinga cooling system has a significant effect on powders freezing time and device required height.