Practicle-laden flow in a square duct with variable roughness /

Abstract

Misty weather is one of the problems in urban areas, especially the areas where there are industries. These industries release Particulate Matter (PM) into the atmosphere that is very dangerous for people‟s health because these Particulate Matters are too small and can easily penetrate the lungs into the bloodstream. To overcome this hazardous effect at indoor places and because of environmental constraints, research is being carried on particle Particle-Laden flow through duct. The particle-laden flow was observed in a square duct with different structure parameters of roughness. The fluid flow in the duct contains various types of particles. The Reynolds Stress Model (RSM) and Discrete particle Model (DPM) was used to numerically simulate the flow. The characteristics of particulate flow, including velocity profile of the fluid and deposition of the particles on the surface of the duct was studied at different values of roughness. The effect of relative roughness height (r/D) and relative spacing (s/r) on the fluid flow was investigated and found that the roughness height has a greater effect as compared to the spacing. The values of relative roughness were taken between 0.024 and 0.1, while the values of spacing between elements ranged from 9.8 to 39.23.The deposition of the particles and the velocity profile of the fluid increases with enhancement of roughness height on the surface of the duct. In case of increasing the space between elements this effect is reversed.