Turbulent deposition and trapping of aerosols at a wall

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Physics of Fluids A; (United States)

DOI:https://doi.org/10.1063/1.858299· OSTI ID:7049276

Brooke, J W; Kontomaris, K; Hanratty, T J ^[1]; McLaughlin, J B ^[2]

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1. Department of Chemical Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
2. Department of Chemical Engineering, Clarkson University, Potsdam, New York, 13676 (United States)

The trajectories of aerosols are computed in a high-resolution direct numerical simulation of turbulent flow in a vertical channel. The aerosol equation of motion includes only a Stokes drag force and the influence of the aerosols on the gas flow is assumed to be negligible. Since the flow is vertical, aerosols deposit as a consequence of the turbulent fluctuations and their own inertia. It is shown that the eddies which are responsible for aerosol deposition are the same eddies that control turbulence production. Typical aerosol trajectories are shown and related to eddy structure. A free-flight theory suggested by Friedlander and Johnstone (Ind. Eng. Chem. {bold 49}, 1151 (1957)) is found to be based on reasonable assumptions about typical velocities of depositing aerosols as they pass through the viscous sublayer, but the theory is shown to be deficient in other respects. The distribution of normal velocities of the aerosols that deposit is compared to the distribution of fluid particle velocities in the viscous sublayer and some support is found for the notion that the probability distribution of Eulerian velocities may be useful in predicting deposition.

• DOE Contract Number: FG02-86ER13556; FG02-88ER13919
• OSTI ID: 7049276
• Journal Information: Physics of Fluids A; (United States), Journal Name: Physics of Fluids A; (United States) Vol. 4:4; ISSN 0899-8213; ISSN PFADE
• Country of Publication: United States
• Language: English

Related Subjects

661300* -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AEROSOLS
COLLOIDS
DEPOSITION
DISPERSIONS
DISTRIBUTION FUNCTIONS
DRAG
FLUID FLOW
FUNCTIONS
NUMERICAL SOLUTION
RELAXATION TIME
REYNOLDS NUMBER
SOLS
STOKES LAW
TRAJECTORIES
TRAPPING
TURBULENT FLOW
VISCOUS FLOW
WALL EFFECTS