Development of a new spray/wall interaction model

Abstract

This paper deals with the development and testing of a new spray/wall impingement model, which is based on the energy conservation law and experimental considerations. A new formula for the viscous dissipated energy of the film is derived in the present investigation to determine the viscous dissipation process of the film in the energy conservation law. In addition, the tangential behavior of droplets after impingement is determined by the newly proposed model, which incorporates both the kinematic parameters of the impinging droplets and the fluid properties. The new model consists of three representative regimes such as rebound, deposition and splash from experimental considerations. To assess the new model, the numerical calculation for several experimental conditions are carried out for the non-evaporative impinging sprays on a flat wall. The numerical results using the new model are compared with the experimental data and the results of the previous impingement models. The results show that the new model generally predicts the splash behavior better than the previous models, and it performs for prediction of local droplet velocities and size effectively, relative to the previous models. Therefore, it can be concluded that the new model is acceptable for predicting the non-evaporative sprays impinging on the wall.