Effect of a deflector on deposition of particles with different diameters in a rib-roughened channel

A particulate flow in a rib-roughened channel is investigated using LRR model and a Lagrangian method. A deflector is placed in the channel to examine its effect on the deposition rate. The results show that a deflector increases the deposition rate with different diameter sizes by increasing the interaction between particles and lower wall. Particles with 50 μm diameter size have a high response time, hence when their path is changed toward the lower wall, they moved near the rough elements until they leave the channel. This behavior increases deposition velocity with this diameter size by 148.36%. For particles with 10 μm diameter size, it is found that deposition velocity increases by 24.71% due to their low response time. This study shows that while a deflector increases the particle deposition rate, it can cause pressure drop due to flow blockage.