A Fundamental Approach to Modeling Transport to an Impinging Spray

This work presents an integrated approach to the modeling of the liquid film resulting from spray impingement. First, fundamental, micro-scale behaviors within the liquid film are investigated with a CFD simulation using a volume-of-fluid model. The mean velocity profile in the liquid film created by a stream of impacting droplets in this simulation are extracted and non-dimensionalized, and then used in the integral conservation equations for mass and momentum in the liquid film to create a 1-D numerical model of the system. An experiment is designed to obtain mean shear stress due to impinging sprays/jets, and the results are compared with the numerical model. Excellent agreement is observed using just one fitting parameter in the numerical model, and this fitting parameter appears to take on physically relevant values.