Abstract
This paper presents a reduced-order model for the design of miniaturized unidirectional air cyclones serving as gas–liquid separators for the removal of oil aerosols from a gas stream. Conservation equations for mass, momentum and energy form the basis for predicting the pressure loss within the model; a modified residence-time model is employed for the separation behavior of oil droplets on the cyclone wall. CFD analysis results for one of the investigated geometries are also presented, serving to validate the velocity field employed within the simplified model and providing predictions for particle trajectories and overall separation efficiency. The numerical model is based on the incompressible RANS equations using the k-ω-SST turbulence model and a Lagrangian description of the dispersed phase (Discrete Particle Method, DPM) with a random-walk model for turbulent dispersion. Numerical solutions have been obtained using the commercial FV (Finite-Volume) solver ANSYS Fluent version 2022R1. Both models are benchmarked against experimental data obtained for a large number of cyclone geometries. Good agreement between experimental results, numerical results and results from the reduced-order model is found. The derived reduced-order model is suitable for rapid design of uniflow cyclones in the investigated configuration space.
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