The diesel particulate filter (DPF) is known for reducing particulate emissions but presents distinct characteristics across different scales. Current research often focuses on a single scale, which limits understanding. This study conducts a multi-scale analysis of a single-channel catalytic diesel particulate filter (CDPF), focusing on flow and heat transfer. The flow parameters of the partitioned porous medium walls at the pore scale were obtained through CT scanning, three-dimensional reconstruction, and lattice Boltzmann method (LBM) simulation, which were subsequently applied in finite volume method simulation to develop a multiscale improved model. A comparative analysis of temperature and pressure drop was conducted among the experimental data, the original model, and the multiscale improved model. Based on an 8-zone simplification and a constant-heat-source regeneration assumption, the flow and heat transfer characteristics in the blank carrier and during particulate regeneration were investigated, with the following results: The porous medium’s permeability affects velocity variation in intake and exhaust channels. Higher intake velocity and entrance temperature increase temperature unevenness and variance on the porous medium’s upper surface. Intake velocity also shifts the location of the temperature peak in the exhaust channel. During regeneration, higher entrance temperature shifts the temperature peak “rightward” in the exhaust channel, with minimal impact on the blank substrate’s position. Both average temperature and flow velocity are higher in the intake and exhaust channels than in the blank substrate. To reduce temperature variance on the porous medium’s surface, appropriate intake velocities and entrance temperatures should be selected based on the CDPF’s operational state.
Zhang et al. (Fri,) studied this question.
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