Experimental Investigation on Continuous Filtration of Sub-Micron Aerosol by Filter Composed of Dual-Layers Including a Nanofiber Layer

Figures & data

TABLE 1 Properties of constituent filter layers

	Nanofiber
	Filter A	Filter B	Filter C	Microfiber Filter D
Mean fiber diameter (nm), d f	300	300	300	1,800
Filter thickness (m), L	1 × 10^− 5	1 × 10^− 5	1 × 10^− 5	1 × 10^− 4
Pressure drop Δ P 0 (Pa) across clean filter at 5 cms^− 1	24.53	14.72	9.81	19.62
Clean filter packing density, c f	0.02403	0.01668	0.01078	0.04845

FIG. 1 Stacking of constituent filter layers within the dual-layer filters E, F, and G.

FIG. 2 Schematic of experimental set-up for testing of fractional efficiency (scheme 1) and loading up test filter (scheme 2).

FIG. 3 Size distribution of aerosol stream loading up filters A, D, E, and F.

FIG. 4 Fractional efficiencies of clean filters A, B, C, D, and F.

FIG. 5 Quality factors of clean filters A, B, C, D, and F.

FIG. 6 Fractional efficiencies of (a) filter A, (b) filter B, (c) filter C, and (d) filter D under continuous loading.

FIG. 7 Change of MPPS of filters A, B, C, and D under continuous loading.

FIG. 8 Pressure drop elevation of (a) filters A, B, C, and (b) filter D under continuous loading.

FIG. 9 Deposition profile of filters A, B, C, and D after collected 4 gm^{− 2} deposit.

FIG. 10 Validating the semi-empirical model.

FIG. 11 Fractional efficiencies of (a) filter E and (b) filter F under continuous loading.

FIG. 12 Pressure drop across filters E, F, and G under continuous loading.

FIG. 13 Deposition profile of filters E and F after collected 5 gm^{− 2} deposit.

FIG. 14 Deposition profile of filter G after collected 5 gm^{− 2} deposit (N = 50).

FIG. 15 Alternative loading and cleaning cycles of filter A.