Document Type: Research Paper
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.
Separation of suspended droplets in a fluid flow has been a great concern for scientists and technologists. In the current study, the effect of the surface roughness on flow field and performance of the cyclone has been studied numerically. The droplets and the turbulent airflow inside the cyclone have been considered as discrete and continuous phases, respectively. The RSM model has been employed for simulating the complex yet strongly anisotropic flow inside the cyclone while the Eulerian-Lagrangian approach has been selected to track droplets motion. The results have been compared to experimental studies. According to the results, the tangential and axial velocities, pressure drop and Euler number decrease when the surface roughness increases. Moreover, the cyclone efficiency decreases due to the decline in vortex length originated from the rise in surface roughness. The differences between numerical and experimental results become significant for higher flow rates. Calculating the impact energy of droplets and imposing the film-wall condition to the walls, splash does not occur.