Abstract
A ‘Group’ model has been developed for impacting sprays. This model uses droplet groups to represent the spray, employs the Lagrangian approach to trace the motion of groups, and considers the turbulent dispersion of droplets within each group. Each group has a dimension and grows during its motion. Droplet dispersion within a group is described by a probability density function. Application to impacting water sprays shows that this ‘Group’ model is very efficient and realistic. The computation time is about a factor of 20 times less than the corresponding calculation using the Stochastic Separated Flow (SSF) approach. The calculated results provide the important information of droplet diameter effects, droplet trajectories, impact velocities, and the impact angles of spray impaction dynamics.
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