Electron microscopic time-lapse visualization of surface pore filtration on particulate matter trapping process
Electron microscopic time-lapse visualization of surface pore filtration on particulate matter trapping process
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DOI：
10.1111/jmi.12386
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发表时间：
2016-09-01
影响因子：
2
通讯作者：
Hanamura, Katsunori
中科院分区：
文献类型：
--
作者：
Sanui, Ryoko;Hanamura, Katsunori
利用扫描电子显微镜（SEM）动态观察柴油机微粒过滤器（DPF）壁面颗粒物（PM）的捕集过程，并将其作为延时图像，在微观尺度上与DPF压降的增加相对应。该可视化和压降测量得出的结论是，PM捕获在表面孔隙中是由PM桥接和堆积在多孔通道中的收缩区域驱动的。这导致在PM捕集过程开始时PM积聚期间的压降急剧增加。根据孔隙率分布和PM在壁表面附近的穿透深度与深度的关系，研究了DPF的多孔结构与表面孔隙深度之间的关系。与假设的表面孔隙深度计算的压降显示出良好的对应关系，测量的压降。
A scanning electron microscope (SEM) was used to dynamically visualize the particulate matter (PM) trapping process on diesel particulate filter (DPF) walls at a micro scale as time-lapse' images corresponding to the increase in pressure drop simultaneously measured through the DPF. This visualization and pressure drop measurement led to the conclusion that the PM trapping in surface pores was driven by PM bridging and stacking at constricted areas in porous channels. This caused a drastic increase in the pressure drop during PM accumulation at the beginning of the PM trapping process. The relationship between the porous structure of the DPF and the depth of the surface pore was investigated in terms of the porosity distribution and PM penetration depth near the wall surface with respect to depth. The pressure drop calculated with an assumed surface pore depth showed a good correspondence to the measured pressure drop.