D

where:

dc = the characteristic length of the collecting medium U = the average gas velocity

D = the diffusion coefficient of the particles as follows:

kTCc 3v/rdp

where:

= the Boltzman constant (1.38 X 10 16 erg/┬░Kelvin) = the absolute temperature = the viscosity of the medium (poise)

dp = the particle diameter

Lee and Liu (1982a,b) use a boundary layer model commonly used in heat and mass transfer analysis with a flow field around multiple cylinders that account for flow interference due to neighboring fibers as follows:

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