Free-flight mixing and deposition of aerosols

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physics of Fluids; (United States)

DOI:https://doi.org/10.1063/1.868398· OSTI ID:6954443

Brooke, J W; 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 13699 (United States)

The mechanism for the deposition of spherical aerosols on a wall is investigated in a high resolution direct numerical simulation of low Reynolds number turbulent flow in a vertical channel. A Stokes drag force is used in the equation of motion for the aerosol and the particles are assumed to have no influence on the flow field. A particle deposits when it is one radius from the wall. This occurs mainly by an inertial-free flight from distances outside the viscous sublayer. Particle concentration profiles are presented as a function of time and as a function of distance from the channel walls. It is shown that particles accumulate in the viscous sublayer by turbophoresis and by free flights that do not carry particles to the wall. A new method for identifying free-flight particles is presented and a prediction of free-flight deposition is made using fluid velocity distributions.

• DOE Contract Number: FG02-88ER13919
• OSTI ID: 6954443
• Journal Information: Physics of Fluids; (United States), Journal Name: Physics of Fluids; (United States) Vol. 6:10; ISSN 1070-6631; ISSN PHFLE6
• 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
CONCENTRATION RATIO
DEPOSITION
DISPERSIONS
DRAG
FLUID FLOW
MIXING
MULTIPHASE FLOW
NUMERICAL SOLUTION
SOLS
TURBULENT FLOW
VISCOUS FLOW