Initial Collection Performance of Resin Wool Filters and Estimation of Charge Density

Figures & data

Figure 1 Scanning electron micrograph of RWF.

Table 1 Properties of raw wool filters and RWF (A and C)

Resin-wool filters [RWF]	Mass fraction [resin/wool]	Thickness [mm]	Average fiber diameter d f [μ m]	Packing density α[−] ^a
Filter A
Raw filter	0	4.52	13.1	0.049
RWF	0.156	5.12	13.1	0.06
Filter C
Raw filter	0	5.45	13.1	0.068
RWF	0.158	5.85	13.1	0.075

Figure 2 Experimental setup for the measurement of collection performance of RWF.

Figure 3 Pressure drops of raw wool filters and RWFs (A and C) as a function of face velocity.

Figure 4 Penetrations of uncharged and singly charged particles through raw wool filters and RWF (A and C).

Table 2 Properties of RWF A and conventional electret filters

Filter type	Charging method	Fiber	Thickness [mm]	Fiber diameter d f [μ m]	Packing density α [−]
RWF (Filter A)	Resin impregnation	Wool, polyester	4.52	13.1	0.049
Electret filter ^a	Corona discharge	Polypropylene	4.95	16.1	0.046
Electret filter ^b	Corona discharge	Polypropylene	0.31	2.64	0.15

Figure 5 Comparison of initial penetrations through RWF A and that through electret polypropylene filter measured by Romay et al. (1998).

Figure 6 Comparison of initial penetrations through RWF A and through melt-brown electret filter measured by Lee et al. (2002).

Figure 7 Experimental single-fiber collection efficiency due to induced force as a function of induced force parameter for RWF A.

Figure 8 Experimental single-fiber collection efficiency due to induced force as a function of induced force parameter for RWF C.

Figure 9 Experimental single-fiber collection efficiency due to Coulombic force as a function of Coulombic force parameter for RWF A.

Figure 10 Experimental single-fiber collection efficiency due to Coulombic force as a function of Coulombic force parameter for RWF C.

Romay , F. J. , Liu , B. Y. H. and Chae , S. J. 1998 . Experimental Study of Electrostatic Capture Mechanisms in Commercial Electret Filters . Aerosol Sci. Technol. , 28 : 224 – 234 .

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Lee , M. H. , Otani , Y. , Namiki , N. and Emi , H. 2002 . Prediction of Collection Efficiency of High-Performance Electret Filters . J. Chem. Eng. Japan , 35 : 57 – 62 . [CROSSREF]

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