Abstract
Numerical simulations are performed for transport and deposition of particles over a fixed obstacle in a fluid flow. The effect of particle size and Stokes number on the particle capture efficiency is investigated using two methods. The first one is one-way coupling combining Lattice Boltzmann (LB) method with Lagrangian point-like approach. The second one is two-way coupling based on the coupling between Lattice Boltzmann method and discrete element (DE) method, which consider the particle influence on the fluid. Then the single fiber collection efficiency characterized by Stokes number (St ) are simulated by LB-DE methods. Results show that two-way coupling method is more appropriate in our case for particles larger than 8 μm . A good agreement has also been observed between our simulation results and existing correlations for single fiber collection efficiency. The numerical simulations presented in this work are useful to understand the particle transport and deposition and to predict the capture efficiency.
Highlights
Particle transport and deposition on various obstacles placed in a fluid flow are fundamental phenomena in many environmental and industrial applications such as transport in porous media, air purification, biological engineering and chemical processes
The interception relies on intercept coefficient R, which is dominant for the particle in the range of 0.1-1 μm, where these other two collection mechanisms, Brownian diffusion and inertial impaction, are relatively weak [9]
In this paper we studied the effect of the particle size on the capture efficiency obtained with one-way coupling and two-way coupling respectively
Summary
Particle transport and deposition on various obstacles placed in a fluid flow are fundamental phenomena in many environmental and industrial applications such as transport in porous media, air purification, biological engineering and chemical processes. For particle-laden flows, the conventional numerically methods have difficulties in adaptive unstructured grids and have to adopt moving mesh for example to assure a high-resolution near the deposit when considering the particle motion It leads to increase the computational cost. We focus on the study of particle with large size where inertial impaction and interception mechanisms are considered. The particle capture process using a self-written code to implement the coupling of Lattice Boltzmann and Discrete element methods (LB-DE methods), which consider the influence of the particle motion on the flow field Another aim is to analyze the effects of Stokes number on single fiber collection efficiency. As St continuously increases (still for low S t), both inertial impaction and interception mechanism exist and dominate under certain conditions In this case, particles follow slightly the fluid streamlines. In order to reduce the effect of interception on the particle capture efficiency, we mainly study the particle with large size in this work
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