Particle deposition and characteristics of turbulent flow in converging and diverging nozzles using Eulerian-Lagrangian approach

Abstract

The current study conducts a thorough assessment of the deposition of aerosol particles in turbulent flows in both converging and diverging nozzles using the Lagrangian particle tracking model and the RNG k-ε turbulence model. The air-particle interaction depends on flow velocity, particle diameter, and types of flow sections when the particles are injected into the airflow. For the parametric simulation, Stokes number is varied from 0.0354 to 0.8265 with the corresponding particle diameter ranging from 2.00 to 10.00 μm, whereas Reynolds number is varied from 5000 to 10,000. Computational results show how the particle deposition efficiency in converging and diverging nozzles is influenced by Stokes number, diameter ratio of pipe, particle diameter, and Reynolds number. The deposition efficiency of a diverging nozzle is found to be lower than that of a converging nozzle, and the flow Reynolds number increases the deposition efficiency slightly in the diverging nozzle but gradually in the converging nozzle.