Prediction and evolution of drop-size distribution for a new ultrasonic atomizer

► A theoretical study of the drop-size distribution evolution applied to a new atomizer device is proposed. ► From two approaches of the Maximum Entropy Formalism( MEF),a specific and a general formulations, a new physically based formulation for spray modeling is derived. ► To solve the problem, a Monte-Carlo Method, which was shown to be convergent, was developed to highlight the formation of new drops due to coalescence, leading to a physically based bi-modal distribution. ► The new approach avoids the traditional adjustment for each operating condition and has better predictive capabilities.