AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
3-D Simulation of Submicron Particle Filtration on an Elliptical Fibrous Surface
MING DONG, Jinyang Li, Sufen Li, Yan Shang, Dalian University of Technology
Abstract Number: 250 Working Group: Control and Mitigation Technology
Abstract Fine particles, as one of the most significant environmental pollution problems, are generally released into the atmosphere from coal-fired power plants, engines, biomass-fired boilers, and so on. Fibrous filters have been widely used to remove aerosol particles from carrier gases due to its simplicity, convenience and high collection efficiency. In this work, a numerical research on the deposition behaviour of submicron particle on an elliptical fibrous surface has been carried out using the CFD-DEM coupled with in-house subroutines. We use a particle interaction model to simulate the particle deposition behaviour on the surface of an elliptical fiber. The model well predicts the formation of the dendrites and the dynamic progression of the deposition. Firstly, for the elliptical fiber, the different angles of orientation relative to the incoming flow increases have little influence on the smaller particle diameter (dp=0.5μ) due to the dominant diffusion mechanism. It is more obvious on larger particle diameter (dp=0.8μm). Secondly, as the inlet fluid velocity increases from 0.1 to 0.8 m/s, the deposition pattern changes from uniform distribution to branched dendrites. The collection efficiency gradually decreases with increasing inlet fluid velocity. The minimum collection efficiency is occurred at vin=0.8m/s. Thirdly, as particle diameter increases from 0.5 to 1.0μm, the deposition dendrites significantly change due to different particle capture mechanisms. The collection efficiency increases with increasing particle diameter. The maximum collection efficiency is occurred at dp=1.0μm. Finally, as the solid volume fraction (SVF) of filter increases from 2.8% to 8.2%, the collection efficiency and the normalized pressure drop increase gradually with the increasing SVF.