Prediction of Droplet Size and Velocity Distribution in Spray Using Maximum Entropy Method

The prediction of droplets diameter and velocity distribution in a spray is so difficult since its process and mechanism is not completely known and depends too many parameters. The early stage of the atomization process (Primary Breakup) is clearly deterministic, whereas the final stage of spray formation (Secondary Breakup) is random and stochastic. In the second region, which deals with the stochastic aspect of droplet size and velocity distributions, analysis is done by using the maximum entropy principle (MEP). The MEP predicts atomization process while satisfying constrain equations of mass, momentum and energy. Finally, an experimental investigation is done to verify the theoretical model. For this means, a specific nozzle is designed and manufactured so the breakup length and the droplet size and velocity distributions are measured using high-speed camera and laser based technique (Phase Doppler anemometry).