Modeling of submicron particle filtration in an electret monolith filter with rectangular cross-section microchannels

Figures & data

Figure 1. Representative channel structure of a monolith filter with square channels.

Figure 2. Comparison of (f_appRe)_fd for a square cross-section channel.

Figure 3. Apparent friction factor-Reynolds number product vs. the axial position for various Kn.

Figure 4. Velocity contours in the square channel at Re = 1.12 and Kn = 0.032. (a) z/(HRe) D 0.087; (b) z/(HRe) D 0.217; (c) z/(HRe) D 0.304.

Table 1. Simulation parameters.

Inlet air velocity	0.2 m/s
Air density	1.25 kg/m^3
Air viscosity	1.82 × 10^−5 m^2/s
Particle density	1000 kg/m^3
Particle charge	0 or 1.6×10^−19C ^a
Charge density on the channel	1.32 × 10^−5C/m^2
Channel length	16 μm
Side length of the channel cross-section	2 μm

^a The particles are assumed to be either uncharged or carry one elementary charge. In the case of uncharged particles, any polarization effects resulting possible charge redistribution within the particle are neglected.

Figure 5. Effect of the inlet velocity.

Figure 6. Effect of the inlet velocity.

Figure 7. Comparison of computational results obtained in this article and experimental results reported in Wu et al. (2013).

Figure 8. The effects of the Knudsen number and Stokes numbers on capture efficiency (a) without the electrostatic force and (b) with the electrostatic force.

Figure 9. The effects of the length of the channel on capture efficiency (a) without the electrostatic force and (b) with the electrostatic force.

Wu, M., Jasper, W. J., Kuznetsov, A. V., Johnson, N., and Rasipuram, S. C. (2013). Submicron Particle Filtration in Monolith Filters—A Modeling and Experimental Study. J. Aerosol Sci., 57:96–113.

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