Efficiency of collection of granular-bed filters due to diffusion and direct interception

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Int. Chem. Eng.; (United States)

OSTI ID:6436599

Kimura, N; Mori, H; Shirato, M; Tomita, T; Yagi, A

An approximate expression for the efficiency of collection of a single sphere taking into account diffusion as well as direct interception is derived theoretically using the Tomotika-Aoi equation for the flow field around an isolated sphere in the viscious regime. The coefficients in that equation are modified on the basis of experiments to obtain an expression for the efficiency of collection in filtration of a gas in a granular bed as a function of the Peclet number and the direct-interception parameter N /SUB R/ . Another empirical expression is also proposed which takes the Reynolds number as well as N /SUB R/ into account. Both expressions satisfactorily describe experimental data for filtration velocities of 0.2-20 cm/s, aerosol particle diameters of 0.31-2 ..mu..m, and packedgranule diameters of 88-4300 ..mu..m, and also agree fairly well with previously reported data in the diffusive range.

• Research Organization: Department of Chemical Engineering, Nagoyo University, Nagoya
• OSTI ID: 6436599
• Journal Information: Int. Chem. Eng.; (United States), Journal Name: Int. Chem. Eng.; (United States) Vol. 25:1; ISSN INCEA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
AEROSOLS
COLLOIDS
DIFFUSION
DISPERSIONS
EFFICIENCY
EQUATIONS
EQUIPMENT
FILTERS
FILTRATION
FLUID FLOW
FLUID MECHANICS
GAS FLOW
GRANULAR BED FILTERS
MECHANICAL FILTERS
MECHANICS
POLLUTION CONTROL EQUIPMENT
REYNOLDS NUMBER
SEPARATION PROCESSES
SOLS