Structural Properties and Filter Loading Characteristics of Soot Agglomerates

Figures & data

FIG. 1 Structure of a diffusion flame burner.

FIG. 2 Schematic the DMA-APM system to measure the mobility size and mass of soot agglomerates.

FIG. 3 Schematic of the filter loading system with soot agglomerates.

FIG. 4 A SEM image of the filter media HE 1071.

TABLE 1 Characteristic parameters for the filter media HE 1071

Thickness	0.47 (mm)
Estimated solidity	0.06
Effective fiber diameter	2.3 (μm)
Basis weight	64 g/m^2
Pressure drop normalized by face velocity	1540 (Pa s/m)

FIG. 5 Number distribution of the soot agglomerates as a function of the mobility diameter; the mode of the distribution is 120 nm.

FIG. 6 The mass of soot agglomerates as a function of the mobility diameter.

FIG. 7 Examples of electron microscopy images of the soot particles.

FIG. 8 The primary particle size distribution measured from TEM images.

FIG. 9 Examples of SEM images of soot particle cakes on filters.

TABLE 2 Measured values of the cake mass, thickness, and porosity from the 12 loading tests

Test ID	Cake mass (mg)	Cake thickness (μm)	Porosity
1	0.5	5	0.9672
2	1.0	5	0.9345
3	1.3	5	0.9148
4	2.2	15	0.9519
5	2.7	32	0.9724
6	3.0	15	0.9345
7	3.2	20	0.9476
8	5.5	43	0.9581
9	9.8	52	0.9382
10	11.3	84	0.9559
11	13.6	118	0.9622
12	14.7	92	0.9476

FIG. 10 The pressure drop at the end of the loading test as a function of the cake mass.