Abstract
Transport of aerosol particles is a fundamental phenomenon in many environmental and industrial applications. Among the several computational fluid dynamical schemes used to study this problem, the lattice Boltzmann methods (LBMs) have shown great promise. Using a 2-D LBM model coupled with a Lagrangian formalism, this study investigates an early stage of particle–surface collisions in a free-stream flow over a semi-infinite array of staggered obstructions at operating conditions of woven-wire screens. After an initial validation of the model, the particle–surface collision efficiency with different diameters is then examined as functions of the number of staggered obstructions, obstruction morphology, and separation distance between two center points of obstructions. Particle motion mechanisms include drag, lift, and Brownian forces. Enhanced collision efficiency of particles to obstructions due to the presence of multiple staggered cylindrical obstructions is identified and highlighted. Based on these i...
Highlights
The transport of aerosol particles in laminar and turbulent flows is encountered in a wide range of natural as well as industrial processes or operations such as atmospheric dispersal of pollutants, deposition of contaminants and drug on the respiratory surfaces, trapping of soot in gas exhaust pipes, sampling radioactive aerosols and micro-contamination control in semiconductor fabrication, etc
Using a 2-D lattice Boltzmann methods (LBMs) model coupled with a Lagrangian formalism, this study investigates an early stage of particle–surface collisions in a free-stream flow over a semi-infinite array of staggered obstructions at operating conditions of woven-wire screens
Numerical simulations have been done for spherical monodisperse aerosol particles with the particle–fluid density ratio (ε) of 833 at room temperature
Summary
The transport of aerosol particles in laminar and turbulent flows is encountered in a wide range of natural as well as industrial processes or operations such as atmospheric dispersal of pollutants, deposition of contaminants and drug on the respiratory surfaces, trapping of soot in gas exhaust pipes, sampling radioactive aerosols and micro-contamination control in semiconductor fabrication, etc. In an early study, Li et al (1994) computationally investigated deposition of aerosol particles in a turbulent duct flow over a single obstacle mounted on the bottom wall of the channel. Later, Brandon and Aggarwal (2001) proposed a 2-D model to simulate aerosol particle motion in laminar channel flows over a single square prism and analyzed particle deposition efficiency as a function of Stokes numbers in the operating condition where inertial impaction dominates. Chen et al (2002) developed a 2-D model that used a single obstruction in free-stream flows with periodical boundary conditions to investigate the effects of obstruction aspect ratio, filter packing density, particulate size, and Reynolds numbers on the aerosol particle deposition efficiency in filters with staggered parallel rectangular obstructions.
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