Abstract
Abstract In this article, lattice Boltzmann method (LBM) is used to simulate the multi-scale flow characteristics of the engine particulate filter at the pore scale and the representative elementary volume (REV) scale, respectively. Four kinds of random wall-pore structures are considered, which are circular random structure, square random structure, isotropic quartet structure generation set (QSGS), and anisotropic QSGS, with difference analysis done. In terms of the REV scale, the influence of different inlet flow velocities and wall permeabilities on the flow in single channel is analyzed. The result indicates that the internal seepage laws of random structures constructed in this article and single channel are in accordance with Darcy’s law. Circular random structure has better permeability than square random structure. Isotropic QSGS has better fluidity than anisotropic one. The flow in single channel is similar to Poiseuille flow. The flow lines in the channel are complicated and a large number of vortices appear at the ends of channel with high inlet flow rate. With the increase of inlet velocity, the static pressure in channel gradually increases along the axial direction as well as the seepage velocity. The temperature field in the channel becomes more uniform as the flow velocity increases, and the higher temperature distribution appears on the wall of the porous media.
Highlights
The particulate matter emitted by the engine will cause environmental pollution and cause serious harm to the human respiratory system [1,2,3,4,5]
The porous media in the wall-flow particulate filters are mostly made of cordierite or silicon carbide, which has advantages of high temperature resistance, low flow resistance and high mechanical strength, and the filtration efficiency of particulate matter can reach more than 95% [7,8]
The channels in the particulate filter are parallel and the adjacent ones are alternately blocked at both ends, forcing the airflow through the wall formed by the porous medium [9]
Summary
The particulate matter emitted by the engine will cause environmental pollution and cause serious harm to the human respiratory system [1,2,3,4,5]. Detailed information of flow can be obtained by studying the transport process through pores of porous media, pore scale is often used to explore the mechanism and basic laws of seepage flow. Lee et al [21] established a stochastic overlapping solid sphere array model, used this model to represent the microstructure of the porous medium in the engine particulate filter, and used the LBM to simulate the flow at the pore scale, and the accuracy of the model was verified. The LBM is used to simulate the flow of the porous media wall of the engine particulate filter at the pore scale, and numerical methods of circular random structure, square random structure, isotropic quartet structure generation set (QSGS), and anisotropic QSGS are applied, respectively, for two-dimensional porous media structure modeling, and the differences of flow characteristics are studied. The LBM is used to analyze the flow field distribution, pressure distribution, and temperature distribution inside a single channel at the REV scale
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