The movement of polydispersed droplets was simulated using a Lagrangian-Eulerian model to calculate the separation efficiency and the moisture distributions in separators. A number density function was used to describe the motion. The mechanism describing the interaction between the droplets and the flow was developed with a δ-function that related the droplet and flow field parameters in a physical model of the polydispersed droplet motion. The mathematical description and numerical methods for solving the physical model was introduced. The efficiencies of the separators computed from this model fit well with experimental data and commercial CFD software model. The moisture distributions inside the separators predicted by the model are reasonable relative to the velocity fields. Thus, the results from the polydispersed droplet motion model are reliable and can be used to design and optimize separator designs.
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